Sulfur recovery system

Chemistry of inorganic compounds – Sulfur or compound thereof – Elemental sulfur

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252445, C01B 1704

Patent

active

040013855

ABSTRACT:
Recovery of chemicals from a sodium sulfide containing pulping liquor which is cycled from a digester through a recovery system is effected by separating hydrogen sulfide gas, either from the cooking liquor or from various points in the recovery system, to provide a source of sulfide sulfur which is oxidized to sulfur. When separated from the cooking liquor, it is preferred that the hydrogen sulfide gas be taken from the black liquor, prior to combustion, so as to reduce the sulfidity of the liquor being burned and thereby to reduce sulfur losses in the combustion furnace and effect reduction of sulfur pollutants. Oxidation of the hydrogen sulfide gas is carried out in an aqueous medium, in the presence of a wetproofed catalyst and using air or other oxygen containing gas as the oxidant. Sour hydrocarbon gases containing hydrogen sulfide gas may also be processed in accordance with this invention to convert the sulfide sulfur to products such as elemental sulfur, sodium polysulfide and the like.

REFERENCES:
patent: 1851312 (1932-03-01), Huff
patent: 1941623 (1934-01-01), Rosenstein
patent: 3666405 (1972-05-01), Winsel
Kirk-Othmer; Encyclopedia of Chem. Tech.; vol. 22; 2nd Ed.; Interscience Publishers, N.Y. 1970; pp. 141-144.

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