Refrigeration – Processes – Circulating external gas
Patent
1988-06-24
1991-05-28
Capossela, Ronald C.
Refrigeration
Processes
Circulating external gas
62 20, 55 68, F25J 300
Patent
active
050191438
ABSTRACT:
A continuous process is described for contacting an olefins-containing feed gas stream 251 l in a demethanizing-absorber column 252, having at least one reboiler 254with a specified lean physical solvent stream 257 to produce a rich solvent bottoms stream 255 containing ethylene and heavier hydrocarbons and an overhead stream 253 containing the remaining lighter components of the feed gas, then regenerating the rich solvent stream 255 in a distillation column 262having at least one reflux condenser 264 and at least one reboiler 266, to produce the ethylene plus hydrocarbon product as overhead stream 278without further need for demethanizing the ethylene plus product by cryogenic fractionation, and the lean physical solvent as bottoms stream 265 for recycling as the lean solvent stream 257 to the contacting step 252.
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