Separation of hydrocarbon mixtures

Details Separation of hydrocarbon mixtures Separation of hydrocarbon mixtures

1988-02-18

1989-07-11

Capossela, Ronald C.

Refrigeration

Processes

Circulating external gas

62 39, F25J 302

Patent

active

048468630

ABSTRACT:
In the method of separating a methane-containing light gas from a feed gas containing heavier hydrocarbons by (i) cooling the feed gas at superatmospheric pressure to partially condense it, (ii) separating a first condensate from the uncondensed gas, (iii) rectifying the uncondensed gas to produce the light gas and a second condensate (preferably by further cooling the uncondensed gas in a refluxing heat exchanger), and (iv) stripping at least one of the condensates in a distillation column to obtain an overhead stream and a liquid product stream, the power requirement is reduced by providing at least part of the cooling for step (i) by expanding at least a part of the feed gas in a turbo-expander which provides energy for compression of product gas comprising said light gas and/or uncondensed gas from the overhead from the distillation column.

REFERENCES:
patent: 3607963 (1971-09-01), Danneil et al.
patent: 4278457 (1981-07-01), Campbell et al.
patent: 4657571 (1987-04-01), Gazzi
patent: 4676812 (1987-06-01), Kummann
patent: 4698081 (1987-10-01), Aghili

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