Refrigeration – Processes – Circulating external gas
Patent
1989-05-15
1990-05-01
Capossela, Ronald C.
Refrigeration
Processes
Circulating external gas
62 39, F25J 302
Patent
active
049215140
ABSTRACT:
The present invention is an energy efficient process for the recovery and purification of C.sub.3.sup.+ hydrocarbons from a high pressure natural gas or refinery/petrochemical feed gas containing C.sub.3.sup.+ hydrocarbons and light gases. In the process, the high pressure feed gas is initially cooled by heat exchange with a multi-component refrigerant fluid circulating in a closed-loop cycle thereby condensing a large portion of the C.sub.3.sup.+ hydrocarbons. The non-condensed, remaining gas is work expanded to an intermediate pressure thus providing refrigeration for condensing the remaining C.sub.3.sup.+ hydrocarbons. The condensed C.sub.3.sup.+ hydrocarbon liquid streams are combined and are further purified by distillation in an integrated distillation column. Optically, refrigeration for refluxing the integrated distillation column can be provided by the mixed refrigerant cycle.
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Ayres Calvin L.
Rowles Howard C.
Air Products and Chemicals Inc.
Capossela Ronald C.
Jones II Willard
Marsh William F.
Simmons James C.
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