Supported Platinum Metal Catalysts
|
|
- Caitlin Shelton
- 5 years ago
- Views:
Transcription
1 Supported Platinum Metal Catalysts THEIR SELECTION AND METHODS OF USE IN INDUSTRIAL PROCESSES By G. C. Bond, Pm., F.R.I.C. and E. J. Sercombe, BSC. Research Laboratories, Johnson Matthey & Co Limited A catalyst has two main functions: (I) By its presence to enable a chemical reaction to proceed much more rapidly, or under milder conditions of temperature and pressure, than would otherwise be possible. (2) To direct the course of a chemical reaction into the commercially desirable route when two or more routes are possible. Of the six platinum metals-platinum, palladium, rhodium, ruthenium, iridium and osmium-all except osmium show remarkable catalytic properties and are widely employed. Each of them has some particular catalytic properties that distinguish it from its neighbours. Some of these properties are truly characteristic of the metal and remain unaffected by variation of the support or solvent. Other properties are modified substantially by the method of preparation of the catalyst. It is not possible, therefore, to state with precision the metal of choice for any particular application, but there are several factors that may be outlined to assist the research or development worker to select the metal most likely to suit his needs. The Choice of Metal Palladium, platinum and rhodium are comparably efficient metals for the hydrogenation of carbon-carbon multiple bonds; ruthenium is generally less efficient. The hydrogenation of olefinic bonds is readily achieved over rhodium, palladium and platinum catalysts, the reaction usually proceeding faster in the presence of solvents such as the lower alcohols or glacial acetic acid. Migration of the double bond, where this is possible, is most marked with palladium catalysts and least with platinum and iridium catalysts. Rhodium, palladium and platinum readily catalyse the hydrogenation of the acetylenic triple bond; the corresponding olefin is formed most selectively (and most stereospecifically) over palladium, and least selectively over platinum. The rate of hydrogenation of the benzene ring catalysed by any of the platinum metals varies greatly with the number and nature of substituent groups. Thus, for example, toluene and other alkyl benzenes are more easily reduced than benzene. The nature of the solvent used is also very important, acetic acid, methanol or, where possible, water being generally preferred. Reduction of the aromatic hydrocarbons does not usually proceed rapidly at room temperature and atmospheric pressure with supported platinum metal catalysts, although Adams platinum oxide is sometimes satisfactory. At high pressures rhodium and ruthenium are the preferred metals. Ruthenium, rhodium, palladium and platinum have all been reported as being active for the hydrogenation of heterocyclic compounds such as pyridine and furan, but elevated pressure is usually required. The hydrogenation of aromatic nitrocompounds to the corresponding amine proceeds readily at room temperature and pressure in the presence of supported palladium catalysts. Platinum and rhodium catalysts are somewhat less effective, while ruthenium catalysts are almost without activity. Aliphatic nitro-compounds are, however, reduced with Platinum Metals Rev., 1965, 9, (3),
2 I The phenomenal development of the petroleum, chemical and pharmaceutical industries during the past two or three decades has largely resulted from the introduction of a wide range of catalysts designed to meet specijc requirements. Among such catalysts are many containing one or more of the platinum metals, the high intrinsic value of these metals in no way inhibiting their use on a large scale. The successful use of a platinum metal catalyst must necessarily depend upon the very high proportion of its initial cost that may be reclaimed following its almost complete recovery from the spent catalyst. On this basis, the net cost of catalyst required to yield a unit increase in the value of the raw material is remarkably low in most industrial processes. This paper reviews the use of the platinum metals as supported catalysts and discusses the factors governing the choice of metal and of support for a variety of industrial reactions. greater difficulty to the corresponding amine, but the intermediate hydroxylamine can sometimes be isolated. Aldehydes and ketones may be reduced catalytically to primary and secondary alcohols respectively. Ruthenium catalysts are particularly suitable for these processes, and the reduction of polysaccharides (with hydrolysis) to cyclitols using ruthenium catalysts is in commercial operation. Palladium and platinum are also effective in this reaction. In acidic solutions there is sometimes a danger of further reduction of the alcohol to the hydrocarbon, especially when the hydroxyl group is activated, as for example in benzyl alcohol. Such hydrogenolysis is minimised by the use of non-polar solvents or by small concentrations of nitrogen bases such as aniline which act as selective poisons. Hydrogenation of nitriles is performed in an acid solution when the corresponding primary amine is the desired product, since substantial amounts of secondary and tertiary amines are formed when hydrogenation is carried out in neutral solution. For the hydrogenation of ethyl or benzyl cyanides, or of benzonitrile, palladium catalysts are more effective than platinum catalysts in either acidic or neutral solution. Hydrogenolysis is the term applied to any process in which the bond between two atoms is cleaved by a molecule of hydrogen. Typical examples are the reductions of benzyl alcohol to toluene, phenol to cyclohexane, alkyl halides to paraffins and halobenzenes to benzene. Conditions of acidity or alkalinity in the solvent, and its polarity, are of great importance to the rate of such processes. Hydrogenolysis often occurs as an undesired side-reaction proceeding simultaneously with another reduction process. Small quantities of alkali are especially effective in arresting the hydrogenolysis of activated hydroxyl groups. Palladium, platinum and rhodium catalysts are all in some measure effective for hydrogenolysis. Thus palladium on charcoal catalysts will readily dehalogenate bromobenzene and benzyl chloride in methanol solution. Rhodium is the metal of choice for the hydrogenation of the aromatic nucleus where hydrogenolysis of substituents such as the methoxy group is to be kept to a minimum. The disproportionation of cyclohexene into cyclohexane and benzene and related reactions are readily carried out under mild conditions by palladium on charcoal catalysts. The method of catalyst preparation is most important here, some types being much more efficient than others. Palladium on calcium carbonate is also effective for this reaction. Palladium catalysts also catalyse hydrogen transfer from a hydrogen donor such as cyclohexene to other hydrogen acceptors. This sometimes forms a convenient basis for smallscale hydrogenations that do not involve molecular hydrogen. Platinum Metals Rev., 1965, 9, (3), 75
3 The preparation of palladium on calcium carbonate being carried out in a 300-gallon glass-lined vessel. The operator is adjusting the rate of addition of reagents during a critical stage of the process Supported platinum is active for the oxidation of primary alcohol groups to the carboxylic acid group under mild conditions. The Choice of Support Once the catalytically active metal has been chosen, it becomes necessary to decide the means by which it can be used most efficiently. The prime function of the support is to extend the surface area of the metal. On a high surface area support such as charcoal the metal may be in the form of islands only one or two atoms thick, thus permitting very effective utilisation of the metal by providing a maximum surface area to weight ratio. The physical characteristics of the support, and in particular its pore structure, may also modify the role of the metal since the course of a reaction is often greatly influenced by the rates of diffusion of reactants and products within the pore structure. Many of the commonly used catalyst supports (particularly alumina and charcoal) are available in a wide variety of particle sizes, each having a range of surface areas and pore-size distributions. The proposed reaction conditions often impose some limitations on the choice of support. For example, the support has to be stable at the temperature used, and it must not react chemically with any of the reactants, products or solvent. It is also particularly necessary, when considering the form of support, to decide on the type of process envisaged, since this will determine whether the support needs to be a powder or some coarser material such as granules or pellets. The factors governing the required properties of the support in each case are so different as to warrant separate discussion. Powdered Supports Certain materials, notably charcoal, have been selected as catalyst supports by reason of their high surface areas and their highly Platinum Metals Rev., 1965, 9, (3), 76
4 adsorptive natures. These can lead to losses of valuable product by adsorption from solution, but as most charcoals are fairly selective this difficulty can often be overcome by changing the grade of charcoal. It is also usually necessary to remove the catalyst from the reaction mixture after use, so all supports must be easily filtrable. This is particularly important with unstable products which need to be isolated rapidly from the reaction mixture before conversion to a stable derivative. The first choice of catalyst support in any development work on liquid-phase reactions is almost invariably charcoal because of its wide range applicability. Johnson Matthey catalysts are prepared on specially selected grades of activated charcoal that are often given further purification and activation treatments before being used as catalyst supports. All the charcoals used have relatively high mechanical strength and stable particle size. Although platinum metals supported on charcoal are not pyrophoric, care must be exercised when they are exposed in the presence of hydrogen or organic solvents and vapours. The use of a standard purging procedure with an inert gas such as nitrogen is recommended, but to avoid all risk of conflagration the catalyst may be supplied in the form of a paste. This is in fact a crumbly powder containing about 55 per cent by weight of water, but with the water entirely held within the pores of the charcoal so that no supernatant liquid is apparent. This paste type of catalyst has obvious advantages in ease of handling, and its use is recommended when the presence of water in the reaction system can be tolerated. Alumina has a much lower surface area than most charcoals, and its use is favoured in reactions where charcoal would give excessive loss of product by adsorption. Alumina-supported metals may, in certain cases, be more selective than the same metal on charcoal in giving the desired product where more than one reaction is possible. The aluminas used are reasonably stable to both dilute acids and alkalis. Pure precipitated calcium carbonate, if carefully selected for particle size, is a very efficient catalyst support. While charcoal and alumina may both be used for all the platinum metals, calcium carbonate is used mainly as a support for palladium, particularly when a selectively poisoned palladium catalyst is required. Silica, either as gel or as kieselguhr, is used when it is essential for the support either to have a low adsorptive capacity or to be neutral rather than amphoteric. Silica-alumina is suitable where there is a particular requirement for an acidic support. Granular Supports The use of granular or pelleted supports facilitates continuous processes using large reactors packed with catalyst. Major industrial applications to date have generally involved vapour phase reactions, but there is an increasing interest in the use of trickle columns to perform continuously reactions that occur essentially in the liquid phase. In these reactions the gas and liquid reactants flow counter-currently through the catalyst bed. A basic requirement for all such catalysts is a high mechanical strength, so that the production of fine particles by attrition is kept to a minimum. Many supports are available in a variety of forms, including irregularly shaped granules, extrudates and regularly shaped pellets. The packing, fluid flow and heat transfer characteristics of each type largely determine their choice by the chemical engineer for a particular requirement. Alumina is the most commonly used support but, like charcoal, it exists in many forms. Alpha aluminas of fairly low surface area have been used in reactions where the support is essentially inert and functions only as a means of extending the surface of the active metal. More frequently the support itself plays a vital part in the reaction and in these cases gamma alumina is predominantly employed. Various anions, either occurring naturally in the alumina surface or added deliberately Platinum Metals Rev., 1965, 9, (3), 77
5 Routine checking of catalyst activity and selectivity in a standard hydrogenation reaction. The technique of gas-liquid chromatography gives a rapid evaluation of samples taken at several stages in the hydrogenation during catalyst manufacture, may influence significantly the overall course of the reaction to be catalysed. Granular charcoal is not easy to obtain with a mechanical strength sufficiently high for the rigorous conditions of gas phase reactions, but is quite capable of being used in trickle column reactors. Various other supports-silica-alumina, silica gel, ceramics-may also be used. When low surface area non-porous ceramic supports, such as Raschig rings are used, the amount of metal that can be firmly deposited is rather limited. Methods of Use The manner in which a supported platinum metal catalyst is used depends upon its physical form. Powdered catalysts and their paste equivalents (where appropriate) are suitable only for liquid-phase reactions carried out in batches. It is essential in these cases to have effective agitation of the system in order to ensure adequate three-phase contact; otherwise the most efficient use of the catalyst will not be achieved. There are several ways in which good agitation may be attained. For very small vessels, rapid shaking is probably easiest; if the catalytic reaction is very rapid, frequencies of over 1000 vibrations per minute may be required. Agitation by high-speed stirring is applicable to any scale of operation, and is especially effective if there are baffles in the vessel. The use of a gas stream to agitate the system is also applicable on any scale of operation. This last method is particularly useful where the gas and catalyst are ejected centrifugally by a stirrer. Agitation conditions are often less critical when the reaction is conducted under pressure. Selectivity in multi-stage processes may also be affected (sometimes advantageously) by inadequate agitation. Charcoal-supported catalysts are unsuitable for use in fluidised-bed reactors because of the lack of uniformity in particle size. Certain aluminas are, however, satisfactory in this method of application. Platinum Metals Rev., 1965, 9, (3), 78
6 Palladium on charcoal catalyst being filtered on a large rotary filter. The catalyst, in the form of a crumbly powder containing about 55 per cent water, is discharged directly into the polythenelined drums for shipment Granular and pelleted catalysts are employed in fixed beds either for gas-phase reactions or, in trickle columns, for continuous liquid-phase reactions. Quality Control of Catalysts There are many variables that may affect the activity or selectivity of a catalyst in any given reaction. Among these are the nature of the support (depending on its origin, mcthod of manufacture and pre-impregnation treatment), the methods employed in impregnating with the metal, and the drying technique used. There exist many techniques for measuring such parameters as chemical composition, surface area, pore size and pore size distribution, but none is as effective in determining accurately the performance of a catalyst in a particular reaction as an activity check carried out under controlled conditions with the same materials, and in the same manner, as are employed in the reaction to be catalysed. In order, therefore, that only catalysts known to have acceptable activity and selectivity for the industrial user s purpose are supplied, it is highly desirable that the reaction in question be carried out on a small scale in the laboratories of the catalyst manufacturer under conditions that approximate as closely as possible to plant operation. A less satisfactory alternative is to use a simpler reaction of the same general type as a quality control test. The hydrogenation of benzene or phenol, for example, may be used for quality control purposes on catalysts for the reduction of unspecified aromatic ring systems. Such compromises may at best, however, offer only a general guide rather than an accurate acceptance criterion. Catalysts for New Processes Catalytic processes of all types play an increasingly important role in the continuing growth of the chemical industries. This provides the impetus for widening the present range of standard catalysts and for the development of new ones for novel applications. Such development entails close and confidential collaboration betwcen the user and the specialist catalyst supplier; the extensive experience gained in this field by the Johnson Matthey Research Laboratories has quite often led to the successful solution of such catalyst problems. Platinum Metals Rev., 1965, 9, (3), 79
A New Platinum Catalyst for the Hydrogenation of Halonitroaromatics
A New Platinum for the Hydrogenation of Halonitroaromatics By G. G. Ferrier and F. King Johnson Matthey Group Research Centre A platinum catalyst has been developed for the selective hydrogenation of halonitroaromatics.
More information1) ABSORPTION The removal of one or more selected components from a gas mixture by absorption is probably the most important operation in the control
1) ABSORPTION The removal of one or more selected components from a gas mixture by absorption is probably the most important operation in the control of gaseous pollutant emissions. Absorption is a process
More informationCrystallization & Filtration
Crystallization & Filtration Purification of Salicyclic Acid and Sodium Chloride Separation processes Liquid-liquid extraction Adsorption Filtration Solid-liquid extraction (leaching) Elution chromatography
More informationVINEETH PRECIOUS CATALYSTS PVT. LTD.
VINEETH PRECIOUS CATALYSTS PVT. LTD. PRODUCT CATALOGUE Office: 9 & 10, Estate No. 3, 15 to 18 Building No.8, Agarwal Udyog Nagar, Sativali Road, Vasai (East), Palghar 401208 Phone: +918149095778 / 779
More informationDevelopment of Enzyme Immobilization Technique
Development of Enzyme Immobilization Technique Professor SEUNG-WOOK KIM Laboratory of Bioprocess Department of Chemical and Biological In this presentation Enzymes Enzymes are are biological biological
More informationPLATINUM METALS REVIEW
PLATINUM METALS REVIEW A quarterly survey of research on the platinum metals and of developments in their applications in industry VOL. 9 JULY 1965 NO. 3 Contents Supported Platinum Metal Catalysts 74
More informationPart 1 Pre-16 The platinum story
Materials 1. Food 3 3 Part 1 Pre-16 The platinum story Teacher s notes This section includes information on platinum (which can be used along with the video), questions to test comprehension, a word search
More informationPERP Program New Report Alert January 2004
PERP Program New Report Alert January 2004 Nexant s ChemSystems Process Evaluation/Research Planning program has published a report, Propylene (02/03-8). Background A continuing trend in the propylene
More informationAssistant Lecturer. Sahar Mohammed Shakir Assistant Lecturer. Abdul Hafeedh Hameed Assistant Lecturer. Ali Basim
Assistant Lecturer Sahar Mohammed Shakir Assistant Lecturer Abdul Hafeedh Hameed Assistant Lecturer Ali Basim Solid organic cpd.s when isolated from organic reaction are impure; they are contaminated with
More informationLecture 6: In Situ Bioremediation and Natural Attenuation
ENGI 7718 Environmental Geotechniques ENGI 9621 Soil Remediation Engineering Lecture 6: In Situ Bioremediation and Natural Attenuation Spring 2011 Faculty of Engineering & Applied Science 1 6.1 Introduction
More informationReaxa Ltd Leeds Bioincubator, Leeds, UK
Reaxa Ltd Leeds Bioincubator, Leeds, UK www.reaxa.com ENCATS TM - Encapsulated Catalysts For Easier, Faster and Cleaner Processes 27 th April 2015. What drives the selection of a Catalyst? Improved yields
More informationCustom Systems Built to Exacting Client Specification
Custom Systems Built to Exacting Client Specification Laboratory Reactor Systems Parr Instrument Company is pleased to work with customers in the design and assembly of complete laboratory or pilot plant
More informationReaxa Ltd. Helping our Life Science Customers to Achieve Easier, Faster and Cleaner Processes
Reaxa Ltd Helping our Life Science Customers to Achieve Easier, Faster and Cleaner Processes What drives the selection of a Catalyst? Improved yields Higher selectivity Reduced work-up Eliminating reprocessing
More informationCase No. 601: Reducing NOx Emissions from Nitric Acid Manufacturing Plants with NOx Abatement or NSCR
STATIONARY EMISSIONS CONTROL 900 FORGE AVENUE Suite 100 AUDUBON, PA 19403-2305 USA T +1484-320-2136 F +1 484-320-2152 WWW. JMSEC.COM : Reducing NOx Emissions from Nitric Acid Manufacturing Plants with
More informationTYPICAL CHARACTERISTICS
RELITE P50 - Granular Activated Carbon RELITE P50 RELITE P50 is a highly active, regenerable granular activated carbon, with porous structure. It is particularly suitable for the removal of chlorine, ozone
More informationLead Poisoning of Automobile Emission Control Catalysts
Lead Poisoning of Automobile Emission Control Catalysts THE INFLUENCE OF EMISSION SYSTEM DESIGN By B. J. Cooper Group Research Centre, Johnson Matthey & Co Limited In a paper presented to the American
More informationGreen Chemistry Five ways in which the Chemical industry can become Greener Changing to renewable sources Use of alternatives to hazardous chemicals
Green Chemistry Green Chemistry refers to the processes in the chemical industry that are being reinvented to make them more sustainable. The term sustain means to keep going. If we use resources faster
More informationReforming is an upgrading process in which low octane gasoline is converted to high octane gasoline.
REFORMING Reforming is an upgrading process in which low octane gasoline is converted to high octane gasoline. Catalytic reforming primarily increases the octane of motor gasoline rather than increasing
More informationBCT Loop Reactor Technology
BCT Loop Reactor Technology By BUSS ChemTech AG www.buss-ct.com Hohenrainstrasse 10 CH-4133 Pratteln 1, Switzerland Tel. + 41 (0) 618 256 462 Fax. +41 (0) 618 256 737 Abstract This paper highlights the
More informationField-tests at Kiviõli Keemiatööstus OÜ oil-shale processing plant in Kiviõli, Estonia
Field-tests at Kiviõli Keemiatööstus OÜ oil-shale processing plant in Kiviõli, Estonia Introduction The field-tests for plasma-treatment of exhaust gases were carried out in several different sites of
More informationSynthetic Petroleum-Based Polymers
Synthetic Petroleum-Based Polymers INTRODUCTION The synthetic polymer industry represents the major end use of many petrochemical monomers such as ethylene, styrene, and vinyl chloride. Synthetic polymers
More informationOff Site Regeneration of UOP Ebz-500 Catalyst: Laboratory Studies and Commercial Experience
Off Site Regeneration of UOP Ebz-500 Catalyst: Laboratory Studies and Commercial Experience Pierre DUFRESNE 1, Maxime MEENS 1, Georges MENDAKIS 2, Dan KAUFF 3 1 Eurecat SA, Quai Jean Jaurès, BP45, 07800
More informationRemoval of Water Supply Contaminants -- Organochlorine Pesticides
CHAIRMAN THOMAS PARK H. S. GUTOWSKY ENGINEERING ROBERT H. ANDERSON FORESTRY STANLEY K. SHAPIRO GEOLOGY LAURENCE L. SLOSS SOUTHERN ILLINOIS UNIVERSITY JOHN C. GUYON UNIVERSITY OF ILLINOIS WILLIAM L. EVERITT
More informationAbstract Process Economics Program Report No. 210 HETEROCYCLIC NITROGEN COMPOUNDS (January 1993)
Abstract Process Economics Program Report No. 210 HETEROCYCLIC NITROGEN COMPOUNDS (January 1993) This report contains preliminary process designs and cost estimates for the production of four heterocyclic
More informationSpecialist in solving environmental problems
Specialist in solving environmental problems P.zza Maggiolini 40, 20015 Parabiago (MI) - ITALY Tel. +39-0331-551668 Fax +39-0331-551642 www.pramec-srl.com pramec@pramec-srl.com INTRODUCTION PRAMEC is a
More informationLecture 23. Nitrophosphate Fertilizers Part 1
Lecture 23 Nitrophosphate Fertilizers Part 1 Introduction Nitrophosphate is the generally accepted term for any fertilizer that is produced by a process involving treatment of phosphate rock with nitric
More informationMSE 352 Engineering Ceramics II
Kwame Nkrumah University of Science & Technology, Kumasi, Ghana MSE 352 Engineering Ceramics II Ing. Anthony Andrews (PhD) Department of Materials Engineering Faculty of Mechanical and Chemical Engineering
More informationThe Effect of Ageing on Physical and Chemical Properties of Asphalt Cement
Iraqi Journal of Chemical and Petroleum Engineering Iraqi Journal of Chemical and Petroleum Engineering Vol.9 No.2 (June 2008) 9-15 ISSN: 1997-4884 University of Baghdad College of Engineering The Effect
More informationBy *T.Khalil, **J. Bossert,***A.H.Ashor and *F. Abou EL-Nour
WM 11 EG0100132 Seventh Conference of Nuclear Sciences & Applications 6-10 February 2000. Cairo, Egypt Preparation, Characterization and application of Alumina powder Produced by advanced Preparation Techniques
More informationMembrane Technologies for Tritium Recovering in the Fusion Fuel Cycle
Membrane Technologies for Tritium Recovering in the Fusion Fuel Cycle S. Tosti 1), L. Bettinali 1), C. Rizzello 2), V. Violante 1) 1) Euratom-ENEA Fusion Association, C. R. ENEA Frascati, 00044 Frascati
More informationmott corporation Process Systems Safe, reliable, fully automated catalyst recovery. The Mott solution.
mott corporation Process Systems Safe, reliable, fully automated catalyst recovery. The Mott solution. Maximizing catalyst retention. Introduction. Process operations involving catalysts have traditionally
More informationRTO OR RCO FOR VOC CONTROL: HOW TO DECIDE
RTO OR RCO FOR VOC CONTROL: HOW TO DECIDE INTRODUCTION Regenerative thermal oxidizers (RTOs) are widely accepted for the control of volatile organic compound (VOC) and hazardous air pollutant (HAP) emissions.
More informationInformation Centre Nitric Acid Plants. Kittiwake Procal Ltd Page 1 of 6
Information Centre Kittiwake Procal Ltd Page 1 of 6 Nitric Acid Nitric acid is a strong highly corrosive and toxic acid. Pure nitric acid is colourless but aged solutions can appear yellow due to oxidation.
More informationCHEMISTRY. SCIENCE Paper 2. (Two hours) You will not be allowed to write during the first 15 minutes.
CHEMISTRY SCIENCE Paper 2 (Two hours) Answers to this Paper must be written on the paper provided separately. You will not be allowed to write during the first 15 minutes. This time is to be spent in reading
More informationExperiment: Acetylation of Ferrocene
Experiment: Acetylation of Ferrocene Ferrocene is an unusual organometallic compound with a structure now understood to be a "sandwich" of an Fe 2+ cation between two parallel cyclopentadienyl anions.
More informationCHAPTER 4. tert-butylation OF ETHYLBENZENE WITH tert-butyl ALCOHOL
72 CHAPTER 4 tert-butylation OF ETHYLBENZENE WITH tert-butyl ALCOHOL 4.1 INTRODUCTION Production of dialkyl-substituted benzene compounds via alkylation, trans-alkylation or disproportionation of aromatic
More informationHow Can Chemical Reactions Be Used to Improve Air Quality?
5.2 Explore How Can Chemical Reactions Be Used to Improve Air Quality? One way to reduce the pollutants in the air is by keeping them from getting into the air in the first place. Some pollutants are solid
More informationPRESENTATION OF NUCLEAR APPLICATIONS OF CONDENSATE TREATMENT
Via Pietro Nenni, 15-27058 VOGHERA ITALY Tel. +39 0383 3371 Fax +39 0383 369052 E-mail: info@idreco.com PRESENTATION OF NUCLEAR APPLICATIONS OF CONDENSATE TREATMENT 0. MAIN CONDENSATE TREATMENT 1. REACTOR
More informationCHAPTER 8 CONCLUSIONS AND SUGGESTIONS FOR FUTURE WORK
CHAPTER 8 CONCLUSIONS AND SUGGESTIONS FOR FUTURE WORK 8.1. Conclusions Referring to the aims of the research project in Chapter 4, the following conclusions can be drawn on the basis of the present work:
More informationProf. J.K. Whitesell. Chem 151. Friday 2/28/2014. Ethanol: From Grains to Gas
1 Nawal Alteliani D2 Prof. J.K. Whitesell Chem 151 Friday 2/28/2014 Ethanol: From Grains to Gas Ethanol is a simple molecule containing only 9 atoms and known to humans long before the arrival of modern
More informationJuly 1977 Subject: Technical Letter 26 Removal of Water Supply Contaminants Chlorophenoxy Acid Herbicides
STATE OF ILLINOIS Department of Registration and Education JOAN G. ANDERSON DIRECTOR. SPRINGFIELD BOARD OF NATURAL RESOURCES AND CONSERVATION JOAN G. ANDERSON CHAIRMAN BIOLOGY THOMAS PARK CHEMISTRY H.
More informationThe Tensile Properties of Iridium
The Tensile Properties of Iridium at High Temperatures By B. L. Mordike, Ph.D., and C. A. Brookes Research Laboratory for the Physics and Chemistry of Solids, Cavendish Laboratory, University of Cambridge
More informationHazardous waste from non-specific sources.
ACTION: Final DATE: 07/23/2010 9:11 AM 3745-51-31 1 3745-51-31 from non-specific sources. (A) The following table lists hazardous wastes from non-specific sources, along with industry and s and hazard
More information). Apart from borax pentahydrate, they are the most widely used industrial borate. O 3. Glass Viscosity Textile Fiber Glass (E Glass) X X X X
H 3 B Orthoboric Acid Boric Acid Technical Grade: Granular, Powder, Extra Fine Powder National Formulary (NF): Granular and Powder Special Quality (SQ): Granular European Pharmacopeia (EP): Granular and
More information1st Pass 1st Pass 1st Pass 2nd Pass 2nd Pass. 1st Pass 1st Pass 1st Pass 2nd Pass 2nd Pass
Gas Adsorbent Media Selection Guide Selection by Application Type Note 1: Many applications with heavy loading levels and mixed contaminants may require the use of two or more types of adsorbent medias
More informationCatalytic air pollution control systems for the removal of volatile organic compounds (VOCs)
Catalytic air pollution control systems for the removal of volatile organic compounds (VOCs) Bietigheim-, 02.08.2010 Catalytic methods to treat hazardous air pollutants are experiencing a comeback. In
More informationSiliaMetS RAPID & RELIABLE ADSORPTION PROCESSING. Process Scale Adsorbent Cartridges for Pharmaceutical Purification
SiliaMetS RAPID & RELIABLE ADSORPTION PROCESSING Process Scale Adsorbent Cartridges for Pharmaceutical Purification Features and Benefits Proven cartridge design ensures rapid, simple & reliable technology
More informationCHAPTER 1 THE CHEMICAL PROCESS INDUSTRY THE CHEMICAL PROCESS INDUSTRY
CHAPTER 1 INTRODUCTION AN OVERVIEW OF THE CHEMICAL PROCESS AND PRIMARY RAW MATERIALS THE CHEMICAL PROCESS The chemical process industry includes those manufacturing facilities whose products result from:
More informationBalston OEM Disposable Filter Solutions
Balston OEM Disposable Filter Solutions Parker Hannifin Corporation, the leader in separation and filtration technologies, is pleased to present a brochure designed to help OEM customers choose the best
More informationEEC 503 Term Project No 2
Overall Objective EEC 503 Term Project No 2 Spring 2012 In preparing this term paper you are expected to demonstrate: a) resourcefulness in (i) outlining of and focusing on the problem, (ii) using effectively
More informationSupporting Information. Identification of N-(2-Phenoxyethyl)imidazo[1,2-a]pyridine- 3-carboxamides as New Anti-tuberculosis Agents
Supporting Information Identification of N-(2-Phenoxyethyl)imidazo[1,2-a]pyridine- 3-carboxamides as New Anti-tuberculosis Agents Zhaoyang Wu, Yu Lu, Linhu Li, Rui Zhao, Bin Wang, Kai Lv, Mingliang Liu,
More informationCode of Federal Regulations
This definition was taken from the Electronic Code of Federal Regulations on 5/6/13. Title 40 - Protection of Environment Volume: 27 Date: 2012-07-01 Original Date: 2012-07-01 Code of Federal Regulations
More informationMicrowave Pyrolysis of C6 Non-aromatic Hydrocarbons
2012 4th International Conference on Chemical, Biological and Environmental Engineering IPCBEE vol.43 (2012) (2012) IACSIT Press, Singapore DOI: 10.7763/IPCBEE. 2012. V43. 6 Microwave Pyrolysis of C6 Non-aromatic
More informationProcess Chem and Pharmaceutical Engineering 1. Solid Liquid Separation
For updated version, please click on http://ocw.ump.edu.my Process Chem and Pharmaceutical Engineering 1 Solid Liquid Separation Wan Nurul Huda binti Wan Zainal Faculty of Engineering Technology wannurulhuda@ump.edu.my
More informationBalston OEM Disposable Filter Solutions
Balston OEM Disposable Filter Solutions Parker Hannifin Corporation, the leader in separation and filtration technologies, is pleased to present a brochure designed to help OEM customers choose the best
More informationTSK-GEL BioAssist Series Ion Exchange Columns
Separation Report No. 100 TSK-GEL BioAssist Series Ion Exchange Columns Table of Contents 1. Introduction 2 2. Basic Properties 2 2-1 Ion-Exchange Capacity and Pore Characteristics 2 2-2 Separation of
More informationReport Requirements (submit electronic and hard copy version) Due Date: 9 AM on May 5, 2014
Spring 2014 EEC 503 Short Team Project Overall Objective In the team report on the project assigned to you it is expected that you will demonstrate: a) resourcefulness in (i) outlining of and focusing
More informationA Case Study from EP3: Pollution Prevention Assessment from a Cattle Hide Tannery. HBI Pub. 10/31/94
A Case Study from EP3: Pollution Prevention Assessment from a Cattle Hide Tannery HBI-94-003-01 Pub. 10/31/94 What is EP3? The amount of pollutants and waste generated by industrial facilities has become
More informationTuofunctional Platinum Catalysts in the Petroleum Industry
Tuofunctional Platinum Catalysts in the Petroleum Industry By Vladimir Haensel and Herman S. Bloch Universal Oil Products Company, Des Plaines, Illinois The transition of petroleum refining from relatively
More informationUNKNOWN UNKNOWNS Requirements: classify your functional group
UNKNOWN UNKNOWNS Candidates: ALCOHOLS Table 70.2, p. 766, 767 CARBOXYLIC ACIDS Table 70.1, p 764,765 ALDEHYDES Table 70.3, p. 767, 768 AMINES Table 70.5, p. 769, 770 KETONES Tabl e 70.14, p. 776 Requirements:
More information2015 AQ Summit: Research Update by Peter Van Walsum
The University of Maine DigitalCommons@UMaine Annual Maine Aquaculture R&D and Education Summits Conferences and Summits 1-14-2015 2015 AQ Summit: Research Update by Peter Van Walsum Peter Van Walsum Follow
More informationRecovery and refining precious metals
Recovery and refining precious metals Recovery and refining of precious metals from hydrocarbon, petroleum, chemical, and petrochemical processes Sabin recovers PGMs and other precious metals from spent
More informationUniversity of Tabriz. From the SelectedWorks of Hosein Afshary. Hosein Afshary, University of Tabriz. Winter February, 2010
University of Tabriz From the SelectedWorks of Hosein Afshary Winter February, 2010 Investigation of deactivation of transition metal oxide catalysts supported on γ-al2o3 during catalytic oxidation of
More informationCPC field-specific training
CPC field-specific training C10G, C10L1/00-C10L1/08 José Carlos Pardo Torre Examiner, European Patent Office June 2018 Table of contents Introduction What and where to classify Neighbouring fields Specific
More informationExperiment: Preparation of Adipic Acid by Oxidative Cleavage of Cyclohexene
Experiment: Preparation of Adipic Acid by xidative Cleavage of Cyclohexene Under mild conditions, only the pi bond of the alkene is cleaved to form 1,2-diols or epoxides. Under more rigorous oxidation
More informationChapter No. 2 EXPERIMENTAL TECHNIQUES IN CHEMISTRY LONG QUESTIONS Analytical Chemistry: The science of chemical characterization is called analytical chemistry. OR The branch of chemistry which deals with
More informationTechnical Information Paper. (R)FCC Slurry Oil Filtration
Technical Information Paper Revision 0, June 2009 INDEX 1. Introduction 1.1 Removing catalyst particles 1.2 Creating value 2. Automatic Gas Assisted Backwash Filtration 2.1 Filter Principles 2.2 Filter
More informationFLASH ROASTING OF SULPHIDE CONCENTRATES AND LEACH RESIDUES USING A TORBED* REACTOR
FLASH ROASTING OF SULPHIDE CONCENTRATES AND LEACH RESIDUES USING A TORBED* REACTOR C. E. Dodson, Torftech (Canada) Inc., 2395 Speakman Drive, Mississauga, Ontario L5K 1B3, Canada V. I. Lakshmanan, R. G.
More informationHYDRODEAROMATIZATION OF GASOLINE FRACTIONS OF ATYRAU OIL REFINERY OF THE REPUBLIC OF KAZAKHSTAN
Int. J. Chem. Sci.: 12(2), 2014, 625-634 ISSN 0972-768X www.sadgurupublications.com HYDRODEAROMATIZATION OF GASOLINE FRACTIONS OF ATYRAU OIL REFINERY OF THE REPUBLIC OF KAZAKHSTAN O. A. FROLOVA *, A. T.
More informationMaximizing returns from precious metal bearing catalysts - your refiner holds the keys
Maximizing returns from precious metal bearing catalysts - your refiner holds the keys Ronald Bleggi Senior Vice President of Finance Sabin Metal Corp., East Hampton, NY 1. Introduction Wildly escalating
More informationTHERMO-CHEMICAL SURFACE HARDENING TREATMENT OF STEELS
THERMO-CHEMICAL SURFACE HARDENING TREATMENT OF STEELS P.K. AGARWAL Senior Engineer, TELCO, Jamshedpur CASE CARBURISING Case Carburising is a process in which austenised ferrous metal is brought into contact
More informationBrent D. Mawdsley, B.Sc. ASL Analytical Service Laboratories Ltd Triumph St., Vancouver, BC V5L 1K5
SPECIALIZED TESTING REQUIREMENTS TO MEET THE BC CONTAMINATED SITES REGULATION Brent D. Mawdsley, B.Sc. ASL Analytical Service Laboratories Ltd. 1988 Triumph St., Vancouver, BC V5L 1K5 ABSTRACT British
More informationSTUDY OF LIQUID-LIQUID EXTRACTION OF PLATINUM GROUP METALS FROM VARIOUS MEDIA.
ABSTRACT OF THE Ph.D. THESIS ENTITLED STUDY OF LIQUID-LIQUID EXTRACTION OF PLATINUM GROUP METALS FROM VARIOUS MEDIA. Submitted to Dr. BABASAHEB AMBEDKAR MARATHWADA UNIVERSITY, AURANGABAD - 431 004 For
More informationPol ymet allic Cluster Catalysts
Pol ymet allic Cluster Catalysts SUPERIOR PROPERTIES FOR SPECIFIC APPLICATIONS By John H. Sinfelt Corporate Research Laboratories, Exxon Research and Engineering Co., Linden, New Jersey Highly dispersed
More informationDehydration of Ethanol over HE-treated Al using the GC -column as Chemical Reactor
Dehydration of Ethanol over HE-treated Al 2 3 using the GC -column as Chemical Reactor by Fikry M. Ebeid Department of Chemistry, Faculty of Science, Qatar University, Doha, Qatar. Department of Chemistry,
More informationAvoiding co-product allocation in the metals sector
Presentation for the ICMM International Workshop on Life Cycle Assessment and Metals Montreal, Canada, 2002.04.15-17. Avoiding co-product allocation in the metals sector Bo P. Weidema & Gregory A. Norris,
More informationModule 4 : Hydrogen gas. Lecture 29 : Hydrogen gas
1 P age Module 4 : Hydrogen gas Lecture 29 : Hydrogen gas 2 P age Keywords: Electrolysis, steam reforming, partial oxidation, storage Hydrogen gas is obtained in a very trace amount in atmosphere. It is
More informationATOM STRUCTURE AND BONDING OF METALS
ATOM STRUCTURE AND BONDING OF METALS The atom is composed of a small, central nucleus, which contains protons and neutrons. Shells, or energy levels of electrons surround this nucleus. These electrons
More informationCorrections to Static Book. Page 18 figure 2-5: delete acetone from figure (I can t do this electronically)
Corrections to Static Book Page 18 figure 2-5: delete acetone from figure (I can t do this electronically) Page 41 Note 1 ninth line: delete second period after Figure 2-6.5 Page 43 Section 2-6.6: replace
More informationPyrolysis of Low Grade Biomass and Waste
Pyrolysis of Low Grade Biomass and Waste Dr. Marion Carrier m.carrier@aston.ac.uk Fuel and Energy Research Forum 27 th June 2017 Leeds Primary processing Biochemical conversion Thermochemical conversion
More informationPERP Program Hydrogen Peroxide-Based Propylene Oxide New Report Alert
PERP Program Hydrogen Peroxide-Based Propylene Oxide New Report Alert February 2008 Nexant s ChemSystems Process Evaluation/Research Planning program has published a report, Hydrogen Peroxide-Based Propylene
More informationSOURCES OF EXPOSURE TO PLATINUM GROUP METALS
4 SOURCES OF EXPOSURE TO PLATINUM GROUP METALS CONTENTS 4.1 OCCUPATIONAL SOURCES OF EXPOSURE 04 4.2 NON-OCCUPATIONAL SOURCES OF EXPOSURE 06 REFERENCES 08 2 SUMMARY Industrial processing has the potential
More informationINSIGHT OF OLEFIN COPOLYMER PROCESSES
INSIGHT OF OLEFIN COPOLYMER PROCESSES Arya Bhardwaj Dept. of Petrochem & Petroleum Refinery Engineering Punjab Technical University, Jalandhar, Punjab, India Abstract - Novel copolymers of α olefins comprised
More informationChapter 9 Summary and outlook
Chapter 9 Summary and outlook During the course of the present study, new precursors were developed and tested for the deposition of tantalum and niobium nitride thin films via Metal Organic Chemical Vapor
More informationCATALYST FILTRATION for the Chemical Processing Industry using Mott LSI Backwash Filter Media
TECHNICAL BULLETIN CATALYST FILTRATION for the Chemical Processing Industry using Mott LSI Backwash Filter Media By Louise Stange, Research & Applications Specialist, Mott Corporation CATALYST FILTRATION
More informationModule No. # 02 Lecture No. # 03 Oil hydrocarbon in marine environment
Health, Safety and Environmental Management in Petroleum and offshore Engineering Prof. Dr. Srinivasan Chandrasekaran Department of Ocean Engineering Indian Institute of Technology, Madras Module No. #
More informationBoiler Tube Deposition - Full scale performance trials have shown that the high
~ IEA Workshop, Cambridge, June 1988. Working Group 2. i.- I'dBORATORY STUDIES INTO THE COMBUSTION OF REFUSE DERIVED FUEL IN CONVENTIONAL STOKERED BOILERS Dr T W A Rampling Warren Spring Laboratory Stevenage,
More information5.3: FILTRATION NOOR MUHAMMAD SYAHRIN BIN YAHYA
5.3: FILTRATION NOOR MUHAMMAD SYAHRIN BIN YAHYA INTRODUCTION Filtration is the removal of solid particles from a fluid by passing the fluid through a filtering medium, or septum, on which the solids are
More informationENVIRONMENTAL ENGINEERING 343
Philadelphia University Faculty of Engineering Department of Civil Engineering First Semester, 2013/2014 ENVIRONMENTAL ENGINEERING 343 Lecture 12: Air pollution 3 SOURCE CONTROL TECHNOLOGY Air quality
More informationThe Suite for Environmental GC Analysis
The Suite for Environmental GC Analysis SGE Environmental GC Columns Performance Selectivity Delivery Promise www.sge.com SGE Environmental GC Columns The Suite for Environmental GC Analysis SGE GC Columns
More informationWET ANALYSIS OF GOLD-SILVER ALLOYS OF HIGH GOLD CONTENT 1
WET ANALYSIS OF GOLD-SILVER ALLOYS OF HIGH GOLD CONTENT EARLE R. CALEY AND LOWELL W. SHANK Department of Chemistry, The Ohio State University, Columbus, Ohio ABSTRACT -silver alloys dissolve completely
More information3011 Synthesis of erythro-9,10-dihydroxystearic acid from oleic acid
311 Synthesis of erythro-9,1-dihydroxystearic acid from oleic acid COOH KMnO 4 /NaOH HO HO COOH C 18 H 34 O 2 (282.5) KMnO 4 (158.) NaOH (4.) C 18 H 36 O 4 (316.5) Literature A. Lapworth und E. N. Mottram,
More informationTM - A New Tool In The Tool Box of Green Chemistry & Green Engineering
Recycle@Source TM - A New Tool In The Tool Box of Green Chemistry & Green Engineering Rajesh Moholkar Newreka Implementation Team Newreka Green-Synth Technologies Pvt. Ltd. Flow Newreka Introduction, platform
More informationMR. D HR UV AS HE R I.C.S.E. BOA RD PAP ER ICSE-2005
MR D HR UV AS HE R ICSE BOA RD PAP ER 200 5 1 ICSE-2005 Section A (40 Marks) (Attempt all questions from this section) Question 1 (a) Write balanced equation s for the following reactions: - [5] (i) Potassium
More informationGTL. and Edited and Revised 2016 by H M Fahmy
GTL Taken Partly from the Internet and Edited and Revised 2016 by H M Fahmy STEPS TO GET OIL FROM SEA OR EARTH SEISMIC SHOOTING SEISMIC INTERPRETATION ANALYSIS OF SAMPLES PREPARATION OF RIG DRILLING OIL
More information4002 Synthesis of benzil from benzoin
4002 Synthesis of benzil from benzoin H VCl 3 + 1 / 2 2 + 1 / 2 H 2 C 14 H 12 2 C 14 H 10 2 (212.3) 173.3 (210.2) Classification Reaction types and substance classes oxidation alcohol, ketone, transition
More informationModule 23 : Tertiary Wastewater Treatment Lecture 39 : Tertiary Wastewater Treatment (Contd.)
1 P age Module 23 : Tertiary Wastewater Treatment Lecture 39 : Tertiary Wastewater Treatment (Contd.) 2 P age 23.3.6 Membrane module A single operational unit into which membranes are engineered for used
More informationMicrobial Metabolism Biodegradation of Organic Compounds
1 Microbial Metabolism Biodegradation of Organic Compounds Ching-Tsan Huang ( 黃慶璨 ) Office: Agronomy Hall, Room 111 Tel: (02) 33664454 E-mail: cthuang@ntu.edu.tw 2 Organic Compounds Natural Products Plants
More informationIsolation of Protein
Isolation of Protein Ultra-centrifugation http://irfanchemist.wordpress.com/2009/04/19/isolation-of-protein / Protein solutions of various masses or densities may separated based on the time it takes to
More informationMON RULE BATCH PROCESS VENT REQUIREMENTS PROCESS VENT REQUIREMENTS. Presented by Michael R. Dixon, P.E. Dixon Environmental BATCH PROCESS VENT
MON RULE BATCH VENT REQUIREMENTS Presented by Michael R. Dixon, P.E. Dixon Environmental VENT REQUIREMENTS Chemical Manufacturing Subpart FFFF 1. Process Vents Continuous See Table 1 of FFFF 2. Process
More information