Pre-fractionation of cracked gas or olefins fractionation by one

Details Pre-fractionation of cracked gas or olefins fractionation by one Pre-fractionation of cracked gas or olefins fractionation by one

1996-09-17

1998-05-05

Capossela, Ronald C.

Refrigeration

Cryogenic treatment of gas or gas mixture

Liquefaction

62613, 62619, 62635, F25J 100

Patent

active

057460663

ABSTRACT:
The present invention is a plurality of stages for partial condensation and phase separation a process gas stream, preferably containing substantial amounts of light olefins, methane, and hydrogen, but containing initially at least substantial amounts of methane and ethylene. Each condensation and separation stage is refrigerated with a subcooled and flashed high pressure liquid of a mixed refrigerant refrigeration loop, wherein throughout the loop the relative component ratios of the mixed refrigerant components are constant, contrasted with the several mixed refrigerant processes of the prior art where for all the streams of each closed refrigeration loop. In addition, rectification and/or stripping sections of an ethylene separation train have a common support construction taking advantage of relatively similar column diameters to reduce the total number of columns in the process.

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Mixed Refrigerant for ethylene (V. Kaiser et al, Hydrocarbon Processing Oct. 1976, pp. 129-131).

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