Energy efficient scrubbing of sulfur compounds from moist gaseou

Details Energy efficient scrubbing of sulfur compounds from moist gaseou Energy efficient scrubbing of sulfur compounds from moist gaseou

1980-06-13

1982-06-01

Spitzer, Robert H.

Gas separation

Means within gas stream for conducting concentrate to collector

55 20, 55 21, 55 48, 55 73, B01D 5314

Patent

active

043325963

ABSTRACT:
In the selective removal of sulfur compounds, e.g., H.sub.2 S, COS, from moist gaseous mixtures, comprising scrubbing the gaseous mixture in a column at a temperature below 0.degree. C., with toluene or xylene as the scrubbing liquid, and prior to the scrubbing stage, contacting the moist gaseous mixture with liquid methanol before the gaseous mixture is cooled to the scrubbing temperature, passing the scrubbing liquid containing absorbed sulfur compounds to a thermal regenerating column, and recycling resultant thermally regenerated scrubbing agent to the scrubbing stage, the improvement of maintaining a methanol concentration of above 2%, e.g. 3-8% to about 30% by weight in the scrubbing liquid to be recycled from the sump of the thermal regenerating column to the scrubbing column. This permits a lower reboiling temperature in the regenerating column so that low pressure steam can be used, among other advantages.

REFERENCES:
patent: 3710546 (1973-01-01), Grunewald et al.
patent: 3899312 (1975-08-01), Kruis et al.
patent: 3910777 (1975-10-01), Jakob
patent: 3935188 (1976-01-01), Karwat
patent: 3975172 (1976-08-01), Ranke
patent: 4050909 (1977-09-01), Ranke
patent: 4137294 (1979-01-01), Braizler et al.
patent: 4155988 (1979-05-01), Karwat et al.

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