Natural gas liquefaction

Details Natural gas liquefaction Natural gas liquefaction

F - Mech Eng,Light,Heat,Weapons

25

J

F25J 3/02 (2006.01) C10G 5/06 (2006.01) C10L 3/10 (2006.01) F25J 1/02 (2006.01)

Patent

CA 2448884

A process for liquefying natural gas (50) in conjunction with producing a liquid stream containing predominantly hydrocarbons heavier than methane (41) is disclosed. In the process, the natural gas stream to be liquefied (31) is partially cooled, expanded to an intermediate pressure (14,15), and supplied to a distillation column (19). The bottom product (41) from this distillation column preferentially contains the majority of any hydrocarbons heavier than methane that would otherwise reduce the purity of the liquefied natural gas (50). The residual gas stream (37) from the distillation column (19) is compressed (16) to a higher intermediate pressure, cooled under pressure (60) to condense it, and then expanded (61) to low pressure to form the liquefied natural gas stream.

L'invention concerne un procédé de liquéfaction d'un gaz naturel (50) avec la production d'un filet liquide contenant surtout des hydrocarbures plus lourds que du méthane (41). Dans ce procédé, le filet de gaz naturel à liquéfier (31) est partiellement refroidi, dilaté à une pression intermédiaire (14, 15), et alimenté dans une colonne de distillation (19). Le produit de fond (41) provenant de cette colonne de distillation contient, de préférence, une majorité d'hydrocarbure plus lourd que du méthane qui dans un autre cas réduirait la pureté du gaz naturel liquéfié (50). Le filet de gaz résiduel (37) provenant de la colonne de distillation (19) est comprimé (16) à une pression intermédiaire supérieure, refroidi sous pression (60) afin d'être condensé, puis dilaté (61) à basse pression afin de former le filet de gaz naturel liquéfié.

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