Sulfur dioxide removal by absorption and fractionation

Details Sulfur dioxide removal by absorption and fractionation Sulfur dioxide removal by absorption and fractionation

1977-09-12

1978-08-29

Bascomb, Jr., Wilbur L.

Gas separation

Means within gas stream for conducting concentrate to collector

55 89, 62 17, 62 24, 203 12, 203 39, 203 74, 203 75, 203 87, 203DIG19, 423244, 423539, F25J 308, B01D 5314, B01D 314

Patent

active

041100875

ABSTRACT:
Anhydrous liquid sulfur dioxide is recovered from environmentally unsuitable vapor or liquid streams comprising water, sulfur dioxide and carbon dioxide. The vapor streams are fed into an absorption zone and contacted with a lean liquid water stream. A resulting sulfur dioxide rich water stream is passed into a first fractionation column utilized in part as the stripper column which produces the lean water stream. A sidecut stream removed above the feed point is passed into a second fractionation column, and the overhead vapor of the first column is subjected to two stages of partial condensation to aid carbon dioxide rejection. Anhydrous sulfur dioxide is removed as a liquid sidecut of the second column, and the net overhead vapor of the second column is preferably passed into the overhead system of the first column after a partial condensation.

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patent: 3832445 (1974-08-01), Kouwenhoven et al.
patent: 3959451 (1976-05-01), Henderson et al.
patent: 3985529 (1976-12-01), Petersson

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