C - Chemistry – Metallurgy – 01 – B
Patent
C - Chemistry, Metallurgy
01
B
23/113
C01B 17/76 (2006.01) C01B 17/80 (2006.01)
Patent
CA 1158415
ABSTRACT The invention relates a process for preparing concentrated sulfuric acid by conducting a gas stream containing SO3 and H2SO4-vapour in a sulfuric acid tower in countercurrent to liquid sulfuric acid formed through a concentrating zone containing filler bodies trickled with sulfuric acid and an absorption zone where sulfuric acid vapour is absorbed in recycled sulfuric acid on filler bodies trickled therewith. A very substantial reduction in the amount of acid mist formed in conventional processes of this type is obtained by maintaining such temperature conditions in the tower that the recycle acid is withdrawn from the tower at a temperature T4 determined by the formula T4 > 140 + 6.alpha. + .beta. + 0.2(T1-Td) where .alpha. is the concentration of SO3 + H2SO4 vapour in the inlet gas to the tower, .beta. the concentration of water vapour in the same inlet gas, T1 the temperature in °C of the same inlet gas and Td the dew point of the sulfuric acid vapour in the same inlet gas. She filters to catch cid mist may be smaller and they will only cause a very small pressure drop. The dimensions of the tower may be diminished to produce the same amount of concentrated sulfuric acid.
373650
Goudreau Gage Dubuc
Haldor Topsoe A/s
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