Natural gas liquefaction

F - Mech Eng,Light,Heat,Weapons – 25 – J

Patent

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F25J 1/00 (2006.01) F25J 3/00 (2006.01)

Patent

CA 2562323

A process for liquefying natural gas in conjunction with producing a liquid stream containing predominantly hydrocarbons heavier than methane is disclosed. In the process, the natural gas stream to be liquefied is partially cooled, expanded to an intermediate pressure, and supplied to a distillation column. The bottom product 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. The residual gas stream from the distillation column is compressed to a higher intermediate pressure, cooled under pressure to condense it, and then expanded to low pressure to form the liquefied natural gas stream.

La présente invention concerne un procédé pour liquéfier du gaz naturel et pour produire conjointement un courant liquide contenant majoritairement des hydrocarbures plus lourds que le méthane. Selon ce procédé, le courant de gaz naturel à liquéfier est partiellement refroidi, détendu à une pression intermédiaire, puis transféré à une colonne de distillation. Le produit de fond de cette colonne de distillation contient de préférence la majorité de tous les hydrocarbures plus lourds que le méthane qui, sinon, réduiraient la pureté du gaz naturel liquéfié. Le courant de gaz résiduel provenant de la colonne de distillation est comprimé à une pression intermédiaire plus élevée, refroidi sous pression afin d'être condensé, puis détendu à basse pression afin de former le courant de gaz naturel liquéfié.

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