Integrated ngl recovery and liquefied natural gas production

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

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F25J 3/02 (2006.01) F25J 1/02 (2006.01)

Patent

CA 2608302

The separation of methane from an admixture (110) with ethane and higher hydrocarbons, especially natural gas, using a scrub column (114), in which the admixture is separated into a methane-rich overhead (116) that is partially condensed (122) to provide reflux to the column (114) and liquid methane- depleted bottoms liquid (126), is improved by providing additional reflux (136) derived from an ethane enriched stream (130) from fractionation (128) of the bottoms liquid. Preferably, absorber liquid (140) from the fractionation (128) also is introduced into the scrub column. The vapor fraction (120) remaining after partial condensation can be liquefied (122) to provide LNG product (124).

La séparation du méthane d'un mélange (110) avec de l'éthane et des hydrocarbures supérieurs, en particulier du gaz naturel, à l'aide d'une colonne d'épuration (114), dans laquelle le mélange est séparé dans une partie de tête (116) riche en méthane laquelle est partiellement condensée (122) pour produire une reflux dans la colonne (114) et le liquide (126) des parties de fond appauvries en métal liquide, est amélioré par production d'un reflux additionnel (136) déviré d'un flux (130) enrichi en éthane provenant d'un fractionnement (128) du liquide des résidus. De préférence, un liquide absorbeur (140) provenant du fractionnement (128) est également introduit dans la colonne d'épuration. La fraction vapeur (120) issue de la condensation partielle peut être liquéfiée (122) afin de produire un produit GNL (124).

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