Process of producing concentrated sulfuric acid

专利名称：Process of producing concentrated sulfuric

acid

发明人：Karl-Heinz Dorr,Hugo Grimm,Ulrich

Sander,Robert Peichl,Franz Maier

申请号：US06/203285申请日：19801103公开号：US04368183A公开日：19830111

摘要：SO.sub.2 -containing, hot gases are catalytically converted in part in a firstcontacting stage. The water and the SO.sub.3 formed is removed from the reaction gas.The remaining gas is heated and then supplied to the second contacting stage. The watervapor content in the reaction gas delivered by a first contacting stage corresponds to anH. sub.2 O/SO.sub. 3 mole ratio below 1. The reaction gas delivered by the first contactingstage is precooled by an indirect heat exchange to such a temperature that the walltemperatures of the heat exchanger are above the dew point temperature of thereaction gas. The precooled reaction gas entering a condensing stage is contacted in aventuri with cocurrent sulfuric acid of 98.0 to 100% concentration and a temperature ofat least 95° C. The exit temperature of the gas from the condensing stage is maintainedat least at 120° C. The gas rises in a succeeding absorption stage through a packing layer,which is contacted with trickling sulfuric acid having a concentration of 98 to 100% and atemperature of 70° to 120° C. The dry gas which leaves the absorption stage and hasbeen freed from SO.sub.3 is maintained at a temperature which is as high as or slightlyhigher than the temperature of the acid as it initially contacts the packing in the

absorption stage. The sulfuric acid concentration is controlled by a supply of water intothe sulfuric acid in the condensing and/or absorption stage.

申请人：METALLGESELLSCHAFT AG,SUED CHEMIE AG

代理机构：Sprung, Horn, Kramer & Woods

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