Process for the liquefaction of natural gas

Details Process for the liquefaction of natural gas Process for the liquefaction of natural gas

1983-10-11

1985-10-22

Sever, Frank

Refrigeration

Processes

Circulating external gas

62 24, 62 40, 62335, 62510, F25J 302

Patent

active

045486298

ABSTRACT:
The present invention is a process for the liquefaction of high pressure natural gas. The natural gas is expanded through a turboexpander to reduce its pressure and thereby cool it. The natural gas is then passed through a demethanizer to remove the heavier components therefrom. The natural gas is then precooled, before substantial warming occurs, by heat exchange with a C.sub.2 hydrocarbon refrigerant, either ethane or ethylene, contained in a single refrigerant system. The precooled natural gas is liquefied by heat exchange with a mixed refrigerant contained in a mixed refrigerant system. The mixed refrigerant consists essentially of nitrogen, methane and a C.sub.2 hydrocarbon, either ethane or ethylene. The mixed refrigerant contained in the mixed refrigerant system is cooled by heat exchange with the C.sub.2 hydrocarbon refrigerant contained in the single refrigerant system.

REFERENCES:
patent: 3763658 (1973-10-01), Gaumer et al.

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