Gas separation – Means within gas stream for conducting concentrate to collector
Patent
1991-04-26
1992-08-11
Nozick, Bernard
Gas separation
Means within gas stream for conducting concentrate to collector
55 48, 55 55, 55 73, 423220, B01D 4700
Patent
active
051375508
ABSTRACT:
The present invention relates to an improvement to a process for the removal of acid gases from a feed stream containing acid gases in which the feed gas is cooled and countercurrently contacted with a liquid absorbent in an absorber tower and the spent absorbent is regenerated by distillation wherein dissolved acid gases are stripped from the spent absorbent thereby producing a regenerated liquid absorbent and recycled to the absorber tower.
The improvement, which is for the production of a product which is essentially free of sulfur containing compounds and has a reduced concentration of carbon dioxide, comprises the following steps: (a) compressing the acid gas-lean product gas to an elevated pressure and cooling the resultant compressed portion; (b) countercurrently contacting the elevated pressure, cooled, acid gas-lean product gas of step (a) and the regenerated liquid absorbent in a second absorber, thereby producing the product, which is essentially free of sulfur containing compounds and has a reduced concentration of carbon dioxide, at the top of the second absorber and a partially spent absorbent at the bottom of the second absorber, wherein said second absorber is operated at a higher pressure than the operating pressure of said absorber tower; (c) recovering the product, which is sulfur containing compounds and has a reduced concentration of carbon dioxide; and (d) using the partially spent absorbent to contact with the feed gas in the absorber tower.
REFERENCES:
patent: 3531917 (1970-10-01), Grunewald
patent: 4414004 (1983-11-01), Wagner et al.
patent: 4824452 (1989-04-01), Grunewald et al.
patent: 4999031 (1991-03-01), Gerhardt et al.
Bono Thomas C.
Hegarty William P.
Air Products and Chemicals Inc.
Marsh William F.
Nozick Bernard
Simmons James C.
Wolff Robert J.
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