Apparatus for concentrating and purifying sulfuric acid

Details Apparatus for concentrating and purifying sulfuric acid Apparatus for concentrating and purifying sulfuric acid

C - Chemistry, Metallurgy

01

B

C01B 17/88 (2006.01) B01J 19/00 (2006.01) B01J 19/02 (2006.01) C22C 38/40 (2006.01) C22C 38/52 (2006.01) C22C 38/54 (2006.01)

Patent

CA 2262265

An apparatus and process for concentrating sulfuric acid to an H2SO4 content of 95 to 98% and optionally for purifying the sulfuric acid at a temperature of 270 to 340°C are described. The apparatus consists at least of a naturally circulating evaporator system (4, 5; 6: 7; 1; 13) comprising a two-part vapour hood (4, 5), a heat exchanger (1), in particular a shell-and-tube heat exchanger, a circulating line (6, 7) and a distillation column (13), wherein the parts of the apparatus conveying the liquid sulfuric acid at a temperature of 270 to 340°C comprising the lower part of the vapour hood (4), heat exchanger (1) and circulating line (6, 7) consist of an austenitic/ferritic iron alloy containing silicon of a specific composition.

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