Article | REF: J3601 V2

Natural gas liquefaction

Authors: Béatrice FISCHER, Gilles FERSCHNEIDER

Publication date: June 10, 2010

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2. Liquefaction processes

To liquefy natural gas, the thermodynamic path followed is shown in figure 6 : the gas is cooled under pressure, then it reaches a zone where the gas and liquid phases coexist, then it becomes totally liquid under pressure, it is then sub-cooled, and finally expanded to be stored at approximately atmospheric pressure.

The various industrial processes used for this type of liquefaction are all based on compression-expansion cycles. The principle of these cycles is shown in figure 7 .

The refrigerant, compressed to a pressure sufficient to condense at the temperature of the available cold source, is expanded to vaporize....

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