Refrigeration – Processes – Circulating external gas
Patent
1984-01-03
1985-04-09
Sever, Frank
Refrigeration
Processes
Circulating external gas
55 68, F25J 302
Patent
active
045099677
ABSTRACT:
A natural gas liquid which has been cryogenically extracted from a natural gas feed is devolatilized by removing a portion of the ethane from the liquid. The natural gas feed stream is initially split into two streams, the smaller part of the stream being fed to the bottom of a demethanizing absorber at a low temperature and the larger part of the stream being fed to the top of the absorber at a substantially lower cryogenic temperature. A methane-rich gas product is recovered from the top of the absorber while the methane-lean liquid in the bottom of the absorber is fed to a non-cryogenic deethanizer. A portion of the volatiles in the methane-lean liquid are removed in the deethanizer and recycled back to the absorber leaving a devolatilized natural gas liquid product.
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Gulsby, J. G., "Options for Ethane Rejection in the Cryogenic Expander Plant", preprint 58th Annual GPA Conv., Mar. 1979.
Brown Rodney F.
Hummel Jack L.
Marathon Oil Company
Sever Frank
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