Absorption process for hydrogen and ethylene recovery

Details Absorption process for hydrogen and ethylene recovery Absorption process for hydrogen and ethylene recovery

1992-08-31

1994-07-05

McFarlane, Anthony

Chemistry of hydrocarbon compounds

Purification, separation, or recovery

By plural serial diverse separations

585833, 62 17, 62 24, 95177, C07C 700, F25J 300, B01D 1900

Patent

active

053269292

ABSTRACT:
A continuous process is described for contacting an olefins-containing feed gas stream, which has been freed of CO.sub.2 and sulfur compounds, compressed, cooled, and dried, with a solvent in an intercooled and reboiled demethanizing absorber to produce a rich solvent bottom stream containing ethylene and heavier hydrocarbons and an absorber overhead stream which is fed to a methane absorber which recovers a hydrogen product stream as overhead and produces a rich solvent stream as bottoms. When recovering up to 50% of the incoming hydrogen, this rich solvent stream from the methane absorber is fed to the demethanizing absorber, but when recovering from 20% to 100% of the incoming hydrogen, this rich solvent stream is recycled in part to the demethanizing absorber and in part is fed to a methane stripper which sends its bottoms to the methane absorber and its overhead to an auto refrigerated recovery unit which removes H.sub.2, CH.sub.4, and CO as a fuel gas product and produces an ethylene and heavier stream. The rich solvent stream from the demethanizing absorber is separated in a solvent regenerator into an overhead stream of ethylene and heavier hydrocarbons and a bottom lean solvent stream for recycle to the methane absorber and then to the demethanizing absorber. The bottom stream of the recovery unit and the overhead stream of the solvent regenerator are combined to form an ethylene and heavier product stream.

REFERENCES:
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"Comparison of the Mehra Process for Nitrogen Rejection to a Cryogenic Process for Nitrogen Rejection from Subquality Natural Gas", Report GRI-90/290, Gas Research Institute pp. 1-62 (1991).
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"KTI/AET offer cracker design for the future", European Chemical News, Oct. 14, 1991, p. 26.

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