C - Chemistry – Metallurgy – 01 – B
Patent
C - Chemistry, Metallurgy
01
B
23/113
C01B 17/775 (2006.01) C01B 17/80 (2006.01)
Patent
CA 1205614
ABSTRACT For the preparation of sulfuric acid a 240-330°C hot gas steam containing SO3 and H2SO4-vapour in a total amount of up to 10% b.v. and up to 50% b v. of steam, the ratio steam/SO3 being at least 1:1, is passed upwards through a bundle of exteriorly cooled, vertical, acid resistant tubes in a heat exchange tower for condensing sulfuric acid. The tubes are cooled with air introduced through an inlet opening in the upper part of the tower and discharged through one or more exit openings in the lower half of the tower. By regulating cooling air velocities and levels from the bottom of the tower of discharging the cooling air the cooling is regulated so as to determine the discharge temperature T4°C by the formula T4 125 + 6.alpha. + .beta. + 0.2(Tl-Td) where is the % b.v. content of SO3 + H2SO4-vapour in the feed gas, its % b.v. content of steam, Tl its temperature in °C and Td its dew point for H2SO4-vapour in °C. Sulfuric acid is condensed on the inner tube walls as a film of liquid flowing downwards and in contact with the hot feed gas is concentrated to 93-98% H2SO4. The apparatus of the invention is a heat exchanger tower with a bundle of vertical, acid resistant tubes, preferably of glass, and two horizontal tube sheet. Tubes may extend below the lower tube sheet into a chamber below the lower tube sheet; hereby the lower zone of the tubes will not be cooled. Circulating sulfuric acid is avoided and good heat economy is obtained.
424458
Goudreau Gage Dubuc
Haldor Topsýe A/s
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