Chemistry of inorganic compounds – Modifying or removing component of normally gaseous mixture – Carbon dioxide or hydrogen sulfide component
Patent
1986-10-23
1988-07-19
Doll, John
Chemistry of inorganic compounds
Modifying or removing component of normally gaseous mixture
Carbon dioxide or hydrogen sulfide component
423573R, 423DIG17, 435168, 435262, 435266, 435822, C01B 1716, C01B 1702, C01B 3120
Patent
active
047584173
ABSTRACT:
The invention provides a process for the removal of hydrogen sulphide from contaminated gas which comprises contacting contaminated gas with an aqueous ferric-ion solution in a first reactor, removing precipitated sulphur from the resulting aqueous iron-containing solution, oxidizing the aqueous iron-containing solution in a second reactor in the presence of an iron-oxidizing microorganism and separating resulting aqueous ferric-ion solution from the microorganism, characterized in that the pH of the aqueous iron-containing solution in the second reactor is maintained in the range 1.2 to 1.9, the total iron concentration in the aqueous solution is at least 15 kg/m.sup.3, and the aqueous ferric-ion solution is separated from the microorganism by ultrafiltration.
REFERENCES:
patent: 3957580 (1976-05-01), Nelson
patent: 4634672 (1987-01-01), Baumgarten et al.
Perry's Chemical Engineers' Handbook, 1984, Perry et al., pp. 17-27, 17-28.
Moore Stephen P.
Obeng Edward D. A.
van Lookeren-Campagne Constant J.
Doll John
Freeman Lori S.
Shell Oil Company
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