Process for isolating n20

C - Chemistry – Metallurgy – 01 – B

Patent

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Details

C01B 21/22 (2006.01) B01D 53/14 (2006.01) B01D 53/56 (2006.01) C07C 45/28 (2006.01) C07C 49/00 (2006.01)

Patent

CA 2669854

The present invention relates to a method for purifying a gas mixture G-0 containing nitrous oxide, comprising at least the bringing of the gas mixture G-0 into contact with a solvent mixture (I) containing at least 50% by weight of water with respect to the total solvent mixture (I), wherein the pH of the solvent mixture (I) ranges from 3.5 to 8.0, the desorption of a gas mixture G-1 from a composition (A), the bringing into contact of the gas mixture G-1 with a solvent mixture (II) containing at least 50% by weight of water with respect to the total solvent mixture (II), wherein the pH of the solvent mixture (II) ranges from 2.0 to 8.0, and the desorption of a gas mixture G-2 from a composition (B), wherein the pH in each case relates to a measurement with a glass electrode. The invention also relates to the use of gas mixtures obtained by the method according to the invention, as oxidizing agents for olefins.

La présente invention concerne un procédé pour la purification d'un mélange gazeux G-0 contenant l'hémioxyde d'azote. Ce procédé comprend au moins la mise en contact du mélange gazeux G-0 avec un mélange de solvants (I), contenant au moins 50 % en poids d'eau sur base de la totalité du mélange de solvants (I), le pH du mélange de solvants (I) se situant dans l'intervalle allant de 3,5 à 8,0, la désorption d'un mélange gazeux G-1 de composition (A), la mise en contact du mélange gazeux G-1 avec un mélange de solvants (II), contenant au moins 50 % en poids d'eau sur base de la totalité du mélange de solvants (II), le pH du mélange de solvants (II) se situant dans l'intervalle allant de 2,0 à 8,0, et la désorption d'un mélange gazeux G-2 de composition (B), le pH reposant chaque fois sur une mesure avec une électrode en verre, ainsi que l'utilisation des mélanges gazeux obtenus par un procédé selon l'invention, comme agent d'oxydation pour des oléfines.

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