Process for producing sweet CO.sub.2 and hydrocarbon streams

Details Process for producing sweet CO.sub.2 and hydrocarbon streams Process for producing sweet CO.sub.2 and hydrocarbon streams

1984-06-28

1985-12-10

Carter, H. T.

Chemistry of inorganic compounds

Modifying or removing component of normally gaseous mixture

Carbon dioxide or hydrogen sulfide component

423220, C01B 1716, C01B 3120

Patent

active

045579113

ABSTRACT:
In a preferred embodiment, carbon dioxide and hydrogen sulfide are removed from a gaseous stream also containing a recoverable hydrocarbon product by CO.sub.2 sweetening, bulk CO.sub.2 removal, and hydrocarbon sweetening absorption steps, each absorption utilizing the same alkanolamine as absorbent. According to another aspect, each amine can be selected from the group consisting of tertiary amines and sterically hindered amines. According to yet another aspect, a feed gas comprising hydrogen sulfide and carbon dioxide can be introduced successively into a carbon dioxide sweetening absorption zone, then into a bulk CO.sub.2 removal absorption zone, then into a hydrocarbon sweetening absorption zone. Alternatively, a feed gas comprising hydrogen sulfide and carbon dioxide can be introduced first into a bulk CO.sub.2 removal absorption zone and then streams from the bulk CO.sub.2 removal zone can be provided respectively to the hydrocarbon sweetening absorption zone and the CO.sub.2 sweetening absorption zone.

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patent: 4405581 (1983-09-01), Savage et al.
patent: 4406868 (1983-09-01), Carter et al.
patent: 4466946 (1984-08-01), Goddin, Jr. et al.

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