Removal of sulfur from waste gas streams

Details Removal of sulfur from waste gas streams Removal of sulfur from waste gas streams

1980-11-24

1982-03-16

Thomas, Earl C.

Chemistry of inorganic compounds

Modifying or removing component of normally gaseous mixture

Sulfur or sulfur containing component

423575, C01B 1700

Patent

active

043201016

ABSTRACT:
Preferential sulfur dioxide absorption solvents may be buffered with suitable agents, such as alkanolaminium carboxylates, to substantially retard or eliminate the tendency of such solvents to degrade or accumulate non-regenerable salts, particularly sulfates, when loaded with absorbed sulfur dioxide. A method for employing the buffer as an immiscible aqueous phase as a separate trimming solvent to selectively absorb residual sulfur dioxide from a gas stream from which the bulk amount of sulfur dioxide is first removed by contact with a trialkyl phosphate solvent is disclosed. The method permits the trialkyl phosphate solvent to be regenerated and purged of salts at lower energy requirements.

REFERENCES:
patent: 3767777 (1973-10-01), Frye et al.
patent: 3904735 (1975-09-01), Atwood et al.
patent: 4222993 (1980-09-01), Holter et al.

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