Hydrocarbon gas processing

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

Patent

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F25J 3/02 (2006.01) C10G 5/06 (2006.01)

Patent

CA 2204264

A process for the recovery of ethane, ethylene, propane, propylene and heavier hydrocarbon components from a hydrocarbon gas stream is disclosed. The stream is divided into first and second streams. The first stream is cooled to condense substantially all of it and is thereafter expanded to the fractionation tower pressure and supplied to the fractionation tower at a first mid-column feed position. The second stream is expanded to the tower pressure and is then supplied to the column at a second mid-column feed position. A recycle stream is withdrawn from the tower overhead after it has been warmed and compressed. The compressed recycle stream is cooled sufficiently to substantially condense it, and is then expanded to the pressure of the distillation column and supplied to the column at a top column feed position. The pressure of the compressed recycle stream and the quantities and temperatures of the feeds to the column are effective to maintain the column overhead temperature at a temperature whereby the major portion of the desired components is recovered.

L'invention concerne un procédé pour l'extraction d'éthane, d'éthylène, de propane, de propylène, et de constituants hydrocarbures plus lourds contenus dans un flux de gaz d'hydrocarbures. Ce flux est divisé en un premier et un second courant. Le premier courant est refroidi pour permettre sa condensation pratiquement totale et est ensuite détendu jusqu'à la pression de la tour de fractionnement à laquelle il est acheminé au niveau d'une première position d'alimentation à mi-colonne. Le deuxième courant est détendu jusqu'à la pression de la tour et est ensuite acheminé à la colonne au niveau d'une deuxième position d'alimentation à mi-colonne. Un courant de recyclage est extrait de la tête de la tour après son réchauffement et sa compression. Ce courant de recyclage comprimé est refroidi suffisamment pour permettre sa quasi-condensation, et est ensuite détendu jusqu'à la pression de la colonne de distillation à laquelle il est acheminé au niveau d'une position d'alimentation en haut de la colonne. La pression du courant de recyclage comprimé ainsi que les quantités et les températures des charges amenées à la colonne sont efficaces pour maintenir la tête de cette dernière à une température permettant d'extraire la majeure partie des constituants souhaités.

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