Fractionation of a hydrocarbon mixture

Details Fractionation of a hydrocarbon mixture Fractionation of a hydrocarbon mixture

1988-04-25

1989-11-21

Capossela, Ronald C.

Refrigeration

Processes

Circulating external gas

62 23, 62 27, 62 42, F25J 300

Patent

active

048819603

ABSTRACT:
For the fractionation of a hydrocarbon mixture, e.g., natural gas rich in a C.sub.2+ fraction, the hydrocarbon mixture is partially condensed and the thus-produced gas/liquid mixture is separated in a distillation column to produce a gaseous overhead fraction containing lighter hydrocarbons and a liquid bottoms product containing heavier hydrocarbons. In the upper column section, the gas is scrubbed with a physical scrubbing agent which is preferably a part of the bottoms product. A gaseous stream is withdrawn from the middle of the column to give the C.sub.4+ bottoms product the proper composition for scrubbing purposes. The scrubbing agent is also subcooled to lower the vapor pressure, preferably by a cooler liquid withdrawn from the column.

REFERENCES:
patent: 4278457 (1981-07-01), Campbell et al.
patent: 4374657 (1983-02-01), Schendel et al.
patent: 4420317 (1983-12-01), Stewart
patent: 4444576 (1984-04-01), Ryan et al.
patent: 4599096 (1986-07-01), Burr

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