Membrane gas separation

B - Operations – Transporting – 01 – D

Patent

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Details

B01D 53/14 (2006.01) B01D 19/00 (2006.01) B01D 61/00 (2006.01) B01D 71/44 (2006.01)

Patent

CA 2572412

The invention relates to gas separation, in particular to separation of C02 from C02-rich liquids, particularly from C02 absorption liquids used in the removal of C02 from off-gases or product flows, such as natural gas or synthesis gas. According to the invention, C02 is separated from a C02-rich liquid by a method comprising a step wherein, under elevated pressure, said liquid is contacted with a membrane based on polyacetylene substituted with trimethylsilyl groups such that the pressure across the membrane is at least 1 bar and that at least a part of the C02 is transported from the liquid through the membrane.

L'invention concerne la séparation de gaz, notamment la séparation de CO2 de liquides riches en CO2, plus précisément de liquides d'absorption de CO2 utilisés pour retirer le CO2 d'effluents gazeux ou d'écoulements de produits, tels que du gaz naturel ou du gaz de synthèse. Selon invention, le CO2 est séparé d'un liquide riche en CO2 par un procédé comportant une étape selon laquelle, sous une pression élevée, ce liquide est mis en contact avec une membrane basée sur du polyacétylène substitué par des groupes de triméthylsilyle de telle façon qu'une pression d'au moins un bar soit exercée sur la membrane et qu'au moins une partie du CO2 soit transporté du liquide à travers la membrane.

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