Integrated multiple-loop refrigeration process for gas...

Details Integrated multiple-loop refrigeration process for gas... Integrated multiple-loop refrigeration process for gas...

F - Mech Eng,Light,Heat,Weapons

25

J

F25J 1/02 (2006.01)

Patent

CA 2662819

A method for liquefying a gas which comprises cooling a feed gas stream successively through two heat exchange zones at respective first and second temperature ranges to provide a liquefied product. The refrigeration for cooling the feed gas stream in the first temperature range is provided by a first vaporizing refrigerant, refrigeration for cooling the stream in the second temperature range is provided by a second vaporizing refrigerant, and additional refrigeration is provided by vaporization, at temperatures above the lowest temperature in the first heat exchange zone, of an auxiliary refrigerant derived from said second vaporizing refrigerant vaporized in said second (coldest) heat exchange zone. The auxiliary refrigerant is of the same composition as the second refrigerant vaporized in the coldest heat exchange zone but is vaporized at a different pressure.

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