Process for desulphurization of a gaseous effluent comprising a device for on-line analysis and control

摘要

The invention concerns a process for desulphurization of a gaseous effluent containing hydrogen sulphide using a Claus treatment unit followed by a Claus tail gas treatment unit (TGT), said process comprising using a device for on-line analysis of the ratio H2S/SO2 at the outlet from the TGT unit and a feed-back loop which can maintain said H2S/SO2 molar ratio at the outlet from the TGT unit to a value close to 2 and generally in the range 1.5 to 2.5.