Refrigeration – Processes – Circulating external gas
Patent
1989-01-12
1990-01-23
Capossela, Ronald C.
Refrigeration
Processes
Circulating external gas
62 24, 62 31, F25J 302
Patent
active
048955841
ABSTRACT:
An improved process for separating a hydrocarbon bearing feed gas containing methane and lighter, C.sub.2 (ethylene and ethane) and heavier components into a fraction containing predominantly methane and lighter components and a fraction containing predominantly C.sub.2 and heavier hydrocarbon components including the steps of cooling and partially condensing and delivering the feed stream to a separator to provide a first residue vapor and a C.sub.2 containing liquid, directing a portion of the C.sub.2 containing liquid into a heavy ends fractionation column wherein the liquid is separated into a second hydrocarbon bearing vapor residue and a C.sub.2 containing product, conducting a portion of the first residue vapors with at least part of the partially condensed second residue into a light ends fractionating column to thereby obtain third residue vapors and liquids, supplying the liquids recovered from the light ends fractionating column to the heavy ends fractionation column as the liquid feed thereto and directing part of the C.sub.2 containing liquid from the first step into intimate contact with the second residue, which liquid provides additional liquefied methane which acts with the partially condensed second residue as a direct contact refrigerant to thereby condense C.sub.2 and heavier components while the methane itself is evaporated in the light ends fractionation column.
REFERENCES:
patent: 3702541 (1972-11-01), Randall et al.
patent: 4171964 (1979-10-01), Campbell et al.
patent: 4272270 (1981-06-01), Higgins
patent: 4617039 (1986-10-01), Buck
patent: 4711651 (1987-12-01), Sharma et al.
patent: 4758258 (1988-07-01), Mitchell et al.
Buck Loren L.
Key Ronald D.
Capossela Ronald C.
Pro-Quip Corporation
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