Selective removal of H.sub.2 S from gas mixtures containing CO.s

Details Selective removal of H.sub.2 S from gas mixtures containing CO.s Selective removal of H.sub.2 S from gas mixtures containing CO.s

1980-08-07

1981-10-06

Thomas, Earl C.

Chemistry of inorganic compounds

Modifying or removing component of normally gaseous mixture

Carbon dioxide or hydrogen sulfide component

423220, 423233, B01D 5334

Patent

active

042935318

ABSTRACT:
A process for selectively absorbing H.sub.2 S from gas mixtures which contain CO.sub.2 and H.sub.2 S in a molar ratio of 4:1 or greater and in which the gas flow rate varies substantially. Alkali metal carbonate solutions are used with absorption under pressure and at an elevated temperature and desorption by steam stripping at about atmospheric pressure. The degree of selectivity of H.sub.2 S removal is maintained constant despite substantial variations in the gas flow rate by maintaining a constant stripping steam/gas ratio selected to provide the desired partial pressure of H.sub.2 S in the purified gas and by adjusting the solution/gas ratio to a value in the vicinity of that at which the partial pressure of H.sub.2 S in the purified gas remains at said selected value while the difference between the partial pressures of CO.sub.2 and H.sub.2 S in the purified gas reaches a maximum value, and by then maintaining such solution/gas ratio as the gas flow rate varies. The process is particularly applicable to H.sub.2 S removal from hot gases produced by the pressure gasification of sulfur-containing coal, oil or the like which are to be used in power generation cycles.

REFERENCES:
patent: 2886405 (1959-05-01), Benson et al.
patent: 3338664 (1967-08-01), Bally et al.
patent: 3725529 (1973-04-01), Glammarco et al.
patent: 3931389 (1976-01-01), Bratzler et al.
patent: 3958943 (1976-05-01), Carmassi et al.
patent: 4106916 (1978-08-01), Tuckett et al.
U.S. Bureau of Mines Report of Investigations 5660.

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