Double mixed refrigerant liquefaction process for natural gas

Details Double mixed refrigerant liquefaction process for natural gas Double mixed refrigerant liquefaction process for natural gas

1983-07-18

1985-03-12

Sever, Frank

Refrigeration

Processes

Circulating external gas

62 34, 62 40, F25J 102, F25J 302

Patent

active

045042969

ABSTRACT:
A process and system are set forth for precooling, liquefying and subcooling a methane-rich feed stream, such as natural gas, with two closed circuit multicomponent refrigerant cycles in which the first refrigerant comprises a binary mixture of propane and butane in a flash refrigeration cycle and the second refrigerant comprises a mixture of nitrogen, methane, ethane, propane and butane in a subcool refrigeration cycle. The first refrigerant preferably cools the feed stream in a plate and fin heat exchanger.

REFERENCES:
patent: 3763658 (1973-10-01), Gaumer et al.
patent: 4094655 (1978-06-01), Krieger
patent: 4112700 (1978-09-01), Forg
patent: 4181174 (1980-01-01), Grenier
patent: 4229195 (1980-10-01), Forg
patent: 4274849 (1981-06-01), Garier
patent: 4339253 (1982-07-01), Caetani

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