Lng vapor handling configurations and methods

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

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F25J 1/00 (2006.01) C07C 7/00 (2006.01) F25J 3/00 (2006.01)

Patent

CA 2544428

LNG vapor from an LNG storage vessel is absorbed using C3 and heavier components provided by a fractionator that receives a mixture of LNG vapors and the C3 and heavier components as fractionator feed. In such configurations, refrigeration content of the LNG liquid from the LNG storage vessel is advantageously used to condense the LNG vapor after separation. Where desired, a portion of the LNG liquid may also be used as fractionator feed to produce LPG as a bottom product.

Selon l'invention, la vapeur de GNL d'un récipient de stockage de GNL est absorbée à l'aide de C¿3? et de composants plus lourds provenant d'une colonne de fractionnement qui reçoit un mélange de vapeurs de GNL, de C¿3? et de composants plus lourds en tant que charge de colonne de fractionnement. Dans lesdites configurations, un contenu de réfrigération du GNL liquide provenant du récipient de stockage de GNL est avantageusement utilisé pour condenser la vapeur de GNL après séparation. Lorsque souhaité, une partie du GNL liquide peut également être utilisée en tant que charge de colonne de fractionnement afin de produire du GPL en tant que résidu.

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