B - Operations – Transporting – 01 – D

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B01D 53/02 (2006.01) B01D 53/04 (2006.01) B01D 53/26 (2006.01) B01D 53/50 (2006.01) B01D 53/75 (2006.01) C01B 31/20 (2006.01) F25J 3/00 (2006.01)

Patent

CA 2693054

The invention relates to a method for the purification of a feed gas stream containing CO2 and at least one impurity, comprising the following successive steps: a) a pre-treatment step; b) a compression step; c) a step comprising the elimination of at least one impurity contained in the compressed gas stream, selected from nitrogen, oxygen, argon and noble gases, using exchangers combined with separators in a cold cycle, i.e. temperature < 5°C and preferably below zero; and d) a step in which the CO2-enriched purified gas stream is recovered in liquid, gaseous or supercritical form. The invention is characterised in that a purification step is performed between steps (a) and (c) in order to eliminate at least paritally at least one impuritiy selected from nitrogen oxides and water.

Procédé de purification d'un flux de gaz d'alimentation contenant du CO2 et au moins une impureté, comprenant les étapes successives suivantes : a) étape de prétraitement; b) étape de compression; c) étape d'élimination d'au moins une impureté, présente dans le flux de gaz comprimé, choisie parmi l'azote, l'oxygène l'argon et les gaz rares à l'aide d'échangeurs combinés à des séparateurs dans un cycle froid, c'est-à-dire à une température < 5°C, de préférence négative; d) étape de récupération d'un flux de gaz purifié, enrichi en CO2, sous forme liquide, gazeuse ou supercritique; caractérisé en ce qu'entre les étapes a) et c) on réalise une étape de purification permettant d'éliminer au moins partiellement au moins une impureté choisie parmi les NOx et l'eau.

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