Liquefaction method comprising at least a coolant mixture...

Details Liquefaction method comprising at least a coolant mixture... Liquefaction method comprising at least a coolant mixture...

2006-08-29

2006-08-29

Tyler, Cheryl (Department: 3744)

Refrigeration

Cryogenic treatment of gas or gas mixture

Liquefaction

C062S611000

Reexamination Certificate

active

07096688

ABSTRACT:
The invention concerns a method comprising: (a) a first step whereby natural gas (1) is subjected to a first refrigerating cycle to obtain cooled natural gas (4), and brought to a temperature less than 20° C. by a first coolant (201); a second step whereby the cooled natural gas (4) is subjected to a second refrigerating cycle wherein the cooled natural gas (4) is cooled and condensed by a second coolant (103) comprising methane, ethane, propane, and nitrogen. The second coolant (103) further contains ethylene, the total ethane and ethylene content being close to 50 mole %.

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