Cryogenic recovery of LPG from natural gas

Details Cryogenic recovery of LPG from natural gas Cryogenic recovery of LPG from natural gas

1982-02-24

1984-02-07

Sever, Frank

Refrigeration

Processes

Circulating external gas

62 31, 62 34, F25J 302

Patent

active

044301030

ABSTRACT:
In accordance with the present invention a natural gas stream predominating in methane and containing significant amounts of C.sub.2, C.sub.3, C.sub.4 and C.sub.5 and higher molecular weight hydrocarbons is cooled in a plurality of cooling stages to a temperature sufficient to produce at least one liquid phase portion predominating in C.sub.2, C.sub.3, C.sub.4 and C.sub.5 and higher molecular weight hydrocarbons, the at least one liquid phase portion predominating in C.sub.2, C.sub.3, C.sub.4 and C.sub.5 and higher molecular weight hydrocarbons is separated from the main gas stream during the course of the cooling, the thus separated liquid phase portion or portions predominating in C.sub.2, C.sub.3, C.sub.4 and C.sub.5 and higher molecular weight hydrocarbons is further separated into a vapor phase portion predominating in C.sub.2, C.sub.3, and C.sub.4 hydrocarbons and at least one liquid phase portion predominating in C.sub.5 and higher molecular weight hydrocarbons, at least one second separation step, at least one portion of the at least one vapor phase portion predominating in C.sub.2, C.sub.3 and C.sub.4, hydrocarbons is recovered as at least one product of the process and at least one portion of the remaining portion of the at least one phase portion predominating in C.sub.2, C.sub.3 and C.sub.4 hydrocarbons is recycled to and recombined with the main gas stream as a liquid phase.

REFERENCES:
patent: 3581511 (1971-06-01), Peck
patent: 3721099 (1973-03-01), Forg et al.
patent: 4235613 (1980-11-01), Castoe et al.

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