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

F - Mech Eng,Light,Heat,Weapons

25

J

162/118

F25J 1/02 (2006.01)

Patent

CA 1232532

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 refrigera- tion cycle and the second refrigerant comprises a mixture of nitrogen, methane, ethane, propane and butane in a subcool refrigeration cycle. The first refrigerant pre- ferably cools the feed stream in a plate and fin heat exchanger.

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