Process to recover liquid methane

Details Process to recover liquid methane Process to recover liquid methane

1993-11-08

1995-05-09

Pal, Asok

Chemistry of hydrocarbon compounds

Purification, separation, or recovery

By plural serial diverse separations

62 24, 95 50, 95121, C07C 700, F25J 302

Patent

active

054141907

ABSTRACT:
To recover liquid methane from a feed gas mixture (1) essentially consisting of methane, C.sub.2+ hydrocarbons, carbon dioxide and nitrogen, the feed gas mixture (1) is fed first to an adsorption unit (E) and freed from water; dried feed gas mixture (2) is fed to a membrane separating unit (F), wherein the carbon dioxide is separated down to a residual content less than 2% by volume (9) and resultant gas mixture (3) now essentially consisting of methane, C.sub.2+ hydrocarbons and nitrogen is fed to a low-temperature distillation (A) wherein the C.sub.2+ hydrocarbons as well as the residual content of carbon dioxide are separated by distillation.

REFERENCES:
patent: 4681612 (1987-07-01), O'Brien et al.
patent: 4936887 (1990-06-01), Waldo et al.
patent: 5233837 (1993-08-01), Callahan

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