Methods for removing malodorous sulfur compounds from pulp mill

Details Methods for removing malodorous sulfur compounds from pulp mill Methods for removing malodorous sulfur compounds from pulp mill

1982-07-09

1984-02-14

Meros, Edward J.

Chemistry of inorganic compounds

Modifying or removing component of normally gaseous mixture

Carbon dioxide or hydrogen sulfide component

423233, 423245, 423DIG3, 162 301, 162 3011, 162 36, 162 51, B01D 5334

Patent

active

044316178

ABSTRACT:
An improved method for removing malodorous sulfur compounds from flue gases generated in kraft or sodium sulfite pulping operations and the like by the absorption process using green liquor, an aqueous solution containing sodium sulfide and sodium carbonate. The malodorous gas compounds, including hydrogen sulfide, methyl mercaptan, and dimethyl sulfide are preferentially absorbed by the sodium sulfide forming sodium hydrosulfide and methanol. Any sulfur dioxide in the gas is absorbed and neutralized by sodium carbonate. In this method carbon dioxide absorption is minimized and the formation of sodium bicarbonate is limited. Sodium bicarbonate formation is minimized in order to avoid its reaction with sodium hydrosulfide which would then release undesirable hydrogen sulfide during absorption, as well as to forestall the need to increase chemical and lime kiln capacity requirements when the green liquor returned to the kraft recovery process contains excess amounts of sodium bicarbonate.

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F. H. Garner et al., "The Selective Absorption of Hydrogen Sulfide in Carbonate Solutions", J. Appl. Chem., May 8, 1958, pp. 325-336.

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