Removal of CO.sub.2 and/or H.sub.2 S from gases

Details Removal of CO.sub.2 and/or H.sub.2 S from gases Removal of CO.sub.2 and/or H.sub.2 S from gases

1984-03-06

1985-11-19

Hart, Charles

Gas separation

Means within gas stream for conducting concentrate to collector

55 55, 55 68, 55 73, 423228, B01D 4700

Patent

active

045539847

ABSTRACT:
CO.sub.2 and/or H.sub.2 S are removed from gases which contain CO.sub.2 and/or H.sub.2 S by a process in which the said gas is treated, in an absorption stage at from 40.degree. to 100.degree. C., with an aqueous absorption liquid containing from 20 to 70% by weight of methyldiethanolamine, the treated gas is taken off at the top of the absorption stage, the aqueous absorption liquid laden with CO.sub.2 and/or H.sub.2 S is taken off at the bottom of the absorption stage and then regenerated by being let down in one or more flash stages, the flash gases being taken off at the top of the flash stage or flash stages, the losses of water as a result of water present in the gas streams taken off at the top of the absorption stage and of the flash stage or flash stages are compensated by feeding in, at the bottom of the last flash stage or, where only one flash stage is used, at the bottom of this, and amount of steam corresponding to the water loss, and the regenerated absorption liquid is recycled to the absorption stage.

REFERENCES:
patent: 4035166 (1977-07-01), van Hecke
patent: 4080424 (1978-03-01), Miller et al.
patent: 4100257 (1978-07-01), Sartori et al.
patent: 4330305 (1982-05-01), Kusessner et al.
patent: 4452763 (1984-06-01), van de Kaats et al.
A. L. Kohl-F. C. Riesenfeld, Gas Purification, 3rd Edition, 1979.

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