Abstract: Processes for the removal of hydrogen sulphide from gas streams and for the regeneration of spent scrubbing liquor used in an absorber to remove hydrogen sulphide from a gas stream, are disclosed. In the former process, hydrogen sulphide is removed by five-valent oxovanadium which is simultaneously reduced to its four-valent state, the precipitation of which is prevented by having a sufficiently high concentration of total alkalinity present in the scrubbing solution. In the latter process the four-valent oxovanadium is oxidized to its five-valent state, preferably by an oxygen-containing gas, and a suffficently high concentration of total alkalinity is provided in the scrubbing liquor to yield a desired re-oxidation rate of the four-valent oxovanadium.
Type:
Grant
Filed:
June 13, 1988
Date of Patent:
May 1, 1990
Assignee:
Sasol Operations (Pty) Ltd.
Inventors:
Robert De Haan, Mark E. Dry, Flemming H. Dressler, Horst J. F. A. Hesse, Sonet Vermaire