Carbon dioxide purification

B - Operations – Transporting – 01 – D

Patent

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Details

B01D 53/22 (2006.01) B01D 53/62 (2006.01) B01D 61/00 (2006.01)

Patent

CA 2724464

A process for the recovery of carbon dioxide from a gas mixture that includes pretreating a gas mixture comprising carbon dioxide, water vapor, and one or more light gases in a pretreating system to form a cooled gas mixture, fractionating the cooled gas mixture to recover a bottoms fraction comprising carbon dioxide and an overheads fraction comprising carbon dioxide and the light gases, passing the overheads fraction over a membrane selective to carbon dioxide to separate a carbon dioxide permeate from a residue gas comprising the light gases, recycling the carbon dioxide permeate to the pretreating system, and recovering at least a portion of the bottoms fraction as a purified carbon dioxide product stream is described.

L'invention porte sur un procédé de récupération de dioxyde de carbone à partir d'un mélange gazeux, qui comprend le prétraitement d'un mélange gazeux comprenant du dioxyde de carbone, de la vapeur d'eau et un ou plusieurs gaz légers dans un système de prétraitement pour former un mélange gazeux refroidi, le fractionnement du mélange gazeux refroidi pour récupérer une fraction de fond comprenant du dioxyde de carbone et une fraction de tête comprenant du dioxyde de carbone et les gaz légers, le passage de la fraction de tête sur une membrane sélective de dioxyde de carbone pour séparer un perméat de dioxyde de carbone d'un gaz résiduel comprenant les gaz légers, le recyclage du perméat de dioxyde de carbone vers le système de prétraitement, et la récupération d'au moins une partie de la fraction de fond, sous forme d'un courant de dioxyde de carbone purifié produit.

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