Method for gas absorption across a membrane

B - Operations – Transporting – 01 – D

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B01D 53/22 (2006.01) B01D 53/14 (2006.01)

Patent

CA 2186461

The invention relates to a method for the absorption of one or more gaseous components from a gas phase, in that the gas phase with the component(s) to be absorbed present therein is brought into contact with a liquid phase, wherein the gas phase and the liquid phase are separated by a hydrophobic membrane of a material other than polytetrafluoroethene, wherein the liquid phase comprises water and a water-miscible and/or water-soluble absorbent, and wherein the liquid phase does not give rise to any leakage from the membrane or is effective in preventing or counteracting leakage from the membrane. According to a first preferred aspect, the liquid phase comprises water and a water-miscible and/or water-soluble organic absorbent, wherein the surface tension at 20 ~C has been brought to at least 60 x 10-3 N/m by adding a water- soluble salt. According to a second preferred aspect, the liquid phase comprises an aqueous solution of a water-soluble amino acid or a salt thereof, such as taurine and derivatives. According to a third preferred aspect, the liquid phase comprises an aqueous solution of a water-soluble phosphate salt. The membranes are preferably in the form of hollow fibres of, for example, polypropene or polyethene. The method is suitable in particular for the absorption of carbon dioxide.

Procédé d'absorption d'un ou plusieurs constituants gazeux à partir d'une phase gazeuse, selon lequel on met une phase liquide en contact avec la phase gazeuse renfermant le ou les constituant(s) à absorber, et on sépare l'une de l'autre la phase gazeuse et la phase liquide à l'aide d'une membrane hydrophobe constituée d'une matière autre que le polytétrafluoroéthylène. La phase liquide comporte de l'eau et un absorbant miscible à l'eau et/ou hydrosoluble, et ne provoque aucune fuite à partir de la membrane, ou peut empêcher ou contrer toute fuite à partir de la membrane. Selon un premier aspect préféré, la phase liquide comporte de l'eau et un absorbant organique miscible à l'eau et/ou hydrosoluble, la tension superficielle à 20 ~C étant portée à au moins 60 x 10?-3¿ N/m par adjonction d'un sel hydrosoluble. Selon un deuxième aspect préféré, la phase liquide comporte une solution aqueuse d'un acide aminé hydrosoluble ou de son sel, par exemple la taurine et ses dérivés. Selon un troisième aspect préféré, la phase liquide comporte une solution aqueuse d'un sel de phosphate hydrosoluble. Les membranes ont de préférence la forme de fibres creuses, par exemple en polypropène ou en polyéthylène. Le procédé est utilisable notamment dans l'absorption du gaz carbonique.

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