A membrane/distillation method and system for extracting co2...

Details A membrane/distillation method and system for extracting co2... A membrane/distillation method and system for extracting co2...

B - Operations, Transporting

01

D

B01D 53/22 (2006.01) C10L 3/10 (2006.01) F25J 3/02 (2006.01)

Patent

CA 2543510

A method of separating CO2 from a hydrocarbon gas inlet stream that is within predetermined pressure and temperature ranges, including the steps of subjecting the inlet stream to fractional distillation providing a CO2 bottom product stream and a distillation overhead stream, passing the distillation overhead stream to the inlet of a primary reflux drum producing a primary reflux liquid stream and a hydrocarbon vapor stream, subjecting the hydrocarbon vapor stream to membrane separation to provide a hydrocarbon product stream and a permeate stream, compressing the permeate stream and recycling the compressed permeate stream to the inlet of the primary reflux drum thereby providing a CO2 liquid product and a hydrocarbon gas product.

L'invention concerne un procédé visant à séparer le CO¿2? d'un flux d'entrée de gaz d'hydrocarbures dont la pression et la température se situent dans des plages prédéterminées. Le procédé comporte les étapes consistant à : soumettre le flux d'entrée à une distillation fractionnée pour former un flux de produit de fond de CO¿2? et un flux de tête de distillation ; faire passer le flux de tête de distillation vers l'entrée d'un ballon de reflux primaire, qui produit un flux liquide de reflux primaire et un flux de vapeurs d'hydrocarbures ; soumettre le flux de vapeurs d'hydrocarbures à une séparation par membrane pour former un flux de produit d'hydrocarbures et un flux de perméat ; comprimer le flux de perméat ; et recycler le flux de perméat comprimé vers l'entrée du ballon de reflux primaire afin de former un produit liquide de CO¿2? et un produit de gaz d'hydrocarbures.

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