A joint venture with AG! ASAHI Glassplant Inc., JAPAN ACID CONCENTRATION PLANTS STANDARDS A TEAM SETS NEW

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1 A joint venture with AG! ASAHI Glassplant Inc., JAPAN ACID CONCENTRATION PLANTS A TEAM SETS NEW STANDARDS

2 A joint venture with AG! ASAHI Glassplant Inc., JAPAN ACID CONCENTRATION PLANTS FROM IDEAL COMBINATION OF MATERIALS ATR-ASAHI has the know-how to use advantageous and economical combination of materials for the various acid concentration application. The team of engineers takes the specific properties of, for example, PTFE, titanium, tantalum, graphite, enameled steel and borosilicate glass into account. Operating reliability is the highest priority. This is greatly enhanced by a correct selection and combination of materials, and the maintenance effort is minimizedan important point for higher profitability since, in addition to the capital costs, maintenance forms and increasingly important cost factor. 2

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4 E4 NOx ABSORPTION EXHAUST AIR E2 E5 C1 V1 E1 C2 T5 E6 STEAM STEAM E3 AIR STEAM T2 T3 T6 P5 E7 E8 P3 T4 STEA M P4 T1 P2 NA- 65% P1 WASTE WATER NITRIC ACID ABOVE 98%

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6 SULPHURIC ACID 20% SULPHURIC ACID 70%

7 A joint venture with AG! ASAHI Glassplant Inc., JAPAN Concentrating to medium concentration The following advantages in comparison to other sulfuric acid evaporators also in use: In forced circulation, no evaporation at the heating surfaces, and therefore no, or substantially reduced, fouling of the heating surfaces. Higher heat transfer due to high liquid velocities in the heater, and thus smaller heating surfaces even for relatively small temperature differences between the heating steam and the boiling temperature. Due to the flash evaporation the high evaporating duly is fully retained at any vacuum. Very reliable operation and rapid adaptation to fluctuating throughput requirements of 0 to 100% of the capacity is made possible by the relatively small hold-up; the plant cab be started-up and shut down in a short time. Horizontal tube single pass evaporators are also used. In this type of equipment the waste acids are concentrated in stages. In the chambers formed by the segment weirs in a single pass. The disadvantage compared with the forced circulation system is the very much greater susceptibility to fouling. Concentrating to high concentration For further concentrating up to 93-96% H2SO4 the type of equipment used for concentrating to medium concentration must be adapted to the changed physical conditions in particular by: Lowering the operating pressure or raising the operating temperature to conform with the sulfuric acid vapour pressure curve. Incorporation of a scrubbing column to remove the vaporized acid fraction from the vapour. The vacuum forced-circulation evaporator already described has also proved effective for concentrating up to 96%. The acid which has under gone preliminary purification by steam stripping is concentrated here in two stages to 96% H2SO4. The acid which has been preconcentrated to 85% in the first stage flows into the second stage-via the scrubbing column; the vapour from this stage is compressed to the higher operating pressure of the first stage by a steam ejector. 7

8 PRODUCTS Process Plants With Guarantees Nitric Acid Concentration. Sulfuric Acid Concentration. De-nitration and NOx absorption with acid recovery. Integrated NAC/SAC. Plants for recycling mixed acids / waste acids from the products of energetic materials and other process industries. Other Process Plants Hcl gas generation with zero discharge. Br2 recovery from NaBr solution. Bromine production from bitterns. Gas absorption for HCl, SO2, Cl2, HBr. Sulfuric acid dilution. Production of sodium hypochlorite. Recovery precious metals from waste streams. Solvent recovery plants. Glass assemblies For almost all unit operations distillation, absorption, adsorption, extraction, crystallization, reaction Overhead equipment on Glass Lined Vessels Glass Process equipment Column, Condensers, Falling film absorbers, Falling film evaporators, Mixer-Settlers, Phase Separators, Dosing pump, Reaction Vessels & Stirrers. Glass Wiped Film Evaporators and Short Path Distillation apparatus. Pilot Plants For all unit operations, general purpose Reaction & Distillation, Photochemical reactions. Fully automated laboratory synthesis units, Mini plant for low-tonnage productions Plants for process validations. Glass Shell & Tube Heat Exchangers Main Condensers, Guard Condensers, Products Coolers, Thermosiphon Reboilers, Waste Heat Economizers Also with SiC tubes, Special design high pressure exchangers. SERVICES Design & Supply of Glass Pilot Plants and Process Plants Basic Engineering Detailed Engineering Stage-wise inspections Erection at site Mechanical Testing Commissioning De-bottlenecking & streamilining Preparation of as built drawings Design & Supply of custom-made equipments PROCESS HEAT TRANSFER 0 0 Single fluid heating / cooling units for Kilo Labs and Mini-plants (-90 C up to 200 C) Single fluid heating / cooling systems for production plants. PROCESS AUTOMATION Turnkey PLC / DCS based systems 668, GIDC Makarpura Vadodara , India Tel: +91 (0265) Fax: +91 (0265) processplant@atrasahiglass.com A joint venture with AG! ASAHI Glassplant Inc., JAPAN Via S. Domenico Savio, Rezzato (BS) ITALY Phone: , Fax: ambrosi.luigi@tin.it