Process for concentrating and purifying sulphuric acid

Details Process for concentrating and purifying sulphuric acid Process for concentrating and purifying sulphuric acid

C - Chemistry, Metallurgy

01

B

C01B 17/90 (2006.01) C01B 17/80 (2006.01) C01B 17/88 (2006.01) C22C 38/34 (2006.01) C22C 38/40 (2006.01) C22C 38/44 (2006.01) C22C 38/50 (2006.01)

Patent

CA 2094453

Process for concentrating and purifying sulphuric acid A B S T R A C T A process for concentrating sulphuric acid to 80 to 97% sulphuric acid content and/or for purifying the sulphuric acid at temperatures from 90 to 350°C and optionally cooling is disclosed wherein the process takes place in a plant in which those components which are contacted by hot sulphuric acid are manufactured in whole or in part of wrought and/or cast materials com- prising austenitic iron-nickel-chromium-silicon alloys comprising 15.5 to 17.5 wt-% nickel, 10 to 12 wt-% chromium, 5.7 to 6.5 wt-% silicon, up to Max. 0.06 wt-% carbon, up to Max. 1.5 wt-% manganese, up to Max. 0.03 wt-% phosphorus, up to Max. 0.03 wt-% sulphur, up to Max. 0.15 wt-% titanium, up to Max. 0.8 wt-% zirconium, up to Max. 0.2 wt-% nitrogen, up to Max. 0.7 wt-% molybdenum, and the remainder iron. Le A 29 017-

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