Process of purifying an h2s- and co2-containing gas

Details Process of purifying an h2s- and co2-containing gas Process of purifying an h2s- and co2-containing gas

B - Operations, Transporting

01

D

B01D 53/34 (2006.01) B01D 53/14 (2006.01) C01B 17/04 (2006.01)

Patent

CA 2041157

ABSTRACT A process of purifying a gas which con- tains combustible components as well as carbon dioxide and sulfur compounds, particularly H2S, in that the gas is scrubbed in a scrubbing zone with a scrubbing solution, which is regenerated and re-used. The scrub- bing solution to be regenerated is pressure-relieved, stripped, and heated in a hot regenerating zone. An exhaust gas which is rich in H2S and comes from the hot regenerating zone is partly combusted in a combustion chamber with oxygen, oxygen-containing gas or air. A gas mixture which is at a temperature in the range from 1000 to 2000 °C and in which at least 30 mole percent of the sulfur supplied to the combustion chamber are contained as elementary sulfur and which also contains the compo- nents H2S and SO2 in a molar ratio of 4:1 to 1:1 is produced in the combustion chamber. The gas mixture is cooled below the dew point temperature of sulfur; con- densed elementary sulfur is removed; the gas mixture is subsequently heated to temperatures of 180 to 280 °C and is then directly subjected to a catalytic hydrogenation and/or hydrolysis, whereby the residual content of SO2 is substantially converted to H2S. At least part of the gas which has thus been treated is contacted as an H2S-containing residual gas with scrubbing solution.

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