ACUMER 2200 High Performance Scale Inhibitor

Transcription

1 Technical Data Sheet ACUMER 2200 High Performance Scale Inhibitor Description ACUMER 2200 is a highly effective scale inhibitor that can be used in industrial water treatment. ACUMER 2200 is a low molecular weight carboxylate copolymer that offers exceptional precipitation inhibition for calcium carbonate and other sparingly soluble salts. It shows good activity over a wide ph range, water hardness and temperature conditions. ACUMER 2200 contains no phosphorus, making its use acceptable where legislation requires that discharge waters contain low or no phosphorus. Typical Properties Solubility (These properties are typical but do not constitute specifications). Property Appearance Chemical nature Molecular Weight 2,000 Total solids (%) 55 ph as is (at 25 C) 4 Density (at 25 C) 1.3 Brookfield viscosity (mpa.s/cps at 25 C) Typical Values Clear light amber solution Carboxylate copolymer ACUMER 2200, due to its chemistry, is extremely tolerant of calcium ions. Its solubility in calcium containing aqueous solutions is notably higher than acrylic homopolymers. The table below compares calcium tolerance of acrylic homopolymers and ACUMER Product Acrylic homopolymer Mw 4500 Acrylic homopolymer Mw 2000 Calcium Tolerance (mg CaCO3/g polymer) ACUMER 2200 > M NaCl, 300 ppm polymer, ph 10, titrated with 15 mg Ca/ml, 5 NTU end point Page 1 of 6 ACUMER /2012, Rev. 0

2 Suggested Application ACUMER 2200 can be used to inhibit scale build up on surfaces through at least three mechanisms: Solubility enhancement or threshold effect, which reduces precipitation of sparingly soluble inorganic salts. Crystal modification, which deforms the growing inorganic salt crystal to give small, irregular, readily fractured crystals that do not adhere well to surfaces. Dispersing activity, which prevents precipitated crystals or other inorganic particulates from agglomerating and depositing on surfaces. The activity of ACUMER 2200 is illustrated by the following data. Scale Inhibition at Heat Transfer Surfaces In evaluating scale inhibition at heat transfer surfaces, ACUMER 2200 was used alone under stressed conditions. Note that its relative effectiveness may change in formulated water treatment systems, or under less stressed conditions. 1. Accelerated Scaling Test Scale inhibition performance of ACUMER 2200 has been evaluated in a laboratory by chronoelectrogravimetry (method described in paper N 114 of NACE corrosion 99). The method involves a three electrode electrochemical cell. The working electrode is composed of a gold coated quartz plate, a microbalance and a potentiostat. A potential is applied to the electrodes and water dissolved oxygen is reduced to OH-. The ph increase at the working electrode surface induces an accelerated scaling. The deposit weight is continuously measured over time. Page 2 of 6 ACUMER /2012, Rev. 0

3 Operating conditions were: Water hardness: 600 ppm (as CaCO3) Water Alkalinity: 600 ppm (as CaCO3) Temperature: 60 C ACUMER 2200 exhibits a much longer induction time than a classical PAA (almost double) and an even longer induction period than a sulfonated copolymer (which is not designed as a calcium carbonate scale inhibitor). 2. Simulated Cooling Tower Test Scale inhibition performance of ACUMER 2200 has also been evaluated on a pilot cooling circuit. The trial conditions, indicated below, were chosen particularly severe in order to shorten the trial duration. Test Conditions: Heat exchanger inlet temperature: 25 C Heat exchanger outlet temperature: 38 C Heat transfer tubes: Stainless steel Holding time index: 6 hours Circuit water ph: Make up water hardness: 300 ppm (as CaCO3) Make up water alkalinity: 280 ppm (as CaCO3) Treatment Program: Product as solids in circuit water: 5 ppm. Operating Conditions The trial objective was to gradually increase the concentration factor until CaCO3 precipitation occurs. Conditions were those indicated in the table below: Time Duration Concentration Factor Ryznar Index 0-2 days days days days days Page 3 of 6 ACUMER /2012, Rev. 0

4 Products Tested: Acrylic homopolymer Mw 4500 Maleic homopolymer ACUMER 2200 Phosphonate (HEDP) The following graph summarizes trials results. It gives values of heat exchange coefficient versus calculated Ryznar index. The graph clearly demonstrates that in difficult cases (e.g. high ph, high temperature, or high concentration factor), ACUMER 2200 can be used very effectively. ACUMER 2200 exhibits a better scale inhibition than maleic homopolymer and a comparable efficacy with a phosphonate such as HEDP. It was also observed at the end of trials that, calcium carbonate deposit formed during the treatment with ACUMER 2200 was neither sticky nor hard but had the appearance of a wet mud which was easy to remove. Thermal and Chemical Stability ACUMER 2200 has excellent thermal and chemical stability and can be used over a broad range of temperature and ph. However, products containing ACUMER 2200 should be formulated between ph 2 and 9 to maintain product stability. Page 4 of 6 ACUMER /2012, Rev. 0

5 Neutralization ACUMER 2200 is supplied as a partially neutralized aqueous solution. The next figure plots ph versus percentage of caustic soda added to the polymer. Storage Recommendation Under long term cold storage, freezing of ACUMER 2200 may cause some separation of the components. Although product performance is not impaired as long as the whole container is heated and well mixed, it is recommended to store ACUMER 2200 at temperatures above freezing. Page 5 of 6 ACUMER /2012, Rev. 0

6 Handling Precautions Storage Disposal Considerations Before using this product, consult the Material Safety Data Sheet (MSDS)/Safety Data Sheet (SDS) for details on product hazards, recommended handling precautions and product storage. Store products in tightly closed original containers at temperatures recommended on the product label. Dispose in accordance with all local, state (provincial) and federal regulations. Empty containers may contain hazardous residues. This material and its container must be disposed in a safe and legal manner. It is the user's responsibility to verify that treatment and disposal procedures comply with local, state (provincial) and federal regulations. Contact your Dow Technical Representative for more information. Chemical Registration Product Stewardship Customer Notice Many countries require the registration of chemicals, either imported or produced locally, prior to their commercial use. Violation of these regulations may lead to substantial penalties imposed upon the user, the importer or manufacturer, and/or cessation of supply. Ensure that all chemicals are registered as required before use. Dow has a fundamental concern for all who make, distribute, and use its products, and for the environment in which we live. This concern is the basis for our product stewardship philosophy by which we assess the safety, health, and environmental information on our products and then take appropriate steps to protect employee and public health and our environment. The success of our product stewardship program rests with each and every individual involved with Dow products - from the initial concept and research, to manufacture, use, sale, disposal, and recycle of each product. Dow strongly encourages its customers to review both their manufacturing processes and their applications of Dow products from the standpoint of human health and environmental quality to ensure that Dow products are not used in ways for which they are not intended or tested. Dow personnel are available to answer your questions and to provide reasonable technical support. Dow product literature, including safety data sheets, should be consulted prior to use of Dow products. Current safety data sheets are available from Dow. Contact: North America: Latin America: (+55) Europe: (+800) (Toll) Asia-Pacific: (+800) (Toll) NOTICE: No freedom from infringement of any patent owned by Dow or others is to be inferred. Because use conditions and applicable laws may differ from one location to another and may change with time, Customer is responsible for determining whether products and the information in this document are appropriate for Customer's use and for ensuring that Customer's workplace and disposal practices are in compliance with applicable laws and other government enactments. The product shown in this literature may not be available for sale and/or available in all geographies where Dow is represented. The claims made may not have been approved for use in all countries. Dow assumes no obligation or liability for the information in this document. References to Dow or the Company mean the Dow legal entity selling the products to Customer unless otherwise expressly noted. NO WARRANTIES ARE GIVEN; ALL IMPLIED WARRANTIES OF MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE ARE EXPRESSLY EXCLUDED. Page 6 of 6 ACUMER /2012, Rev. 0