C - Chemistry – Metallurgy – 01 – B
Patent
C - Chemistry, Metallurgy
01
B
23/332, 23/343
C01B 17/04 (2006.01) B01D 53/86 (2006.01)
Patent
CA 1212521
ABSTRACT PROCESS FOR PURIFYING CLAUS TAIL GAS The invention relates to a process for purifying Claus tail gas by catalytic reduction of the said gas with formation of hydrogen sulphide, cooling of the gas, condensing and separating water from the exhaust gas, adjusting the H2S/SO2 ratio necessary for the further Claus reaction by combining the tail gas with an SO2-containing gas produced by combustion and conducting the combined gases through a first Claus catalyst stage below the sulphur dew point. The process is characterised in that the SO2-containing gas produced by combustion is cooled to a regeneration temperature or cooling temperature and conducted through the second catalyst stage charged with sulphur or respectively freed from sulphur and thereby regenerates or cools the said stage, the sulphur taken up in the regeneration phase is condensed out and separated from the SO2-containing gas, after being combined with the tail gas, is conducted through the first catalyst stage for the formation and separation of sulphur. The process permits a flexible control of the temperature of the regenerating gas, corresponding to the regeneration and cooling phases.
450514
Davy Mckee Aktiengesellschaft
Stewart & Kolash Ltd
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