Patent ID: 8409329

Claim:
A method for the purification of a feed gas stream containing CO 2 , water and at least one impurity chosen from SOx and NOx, comprising the following steps: a) pretreating the feed gas stream, at least partially eliminating one of the impurities selected from the group consisting of nitrogen, oxygen, argon, the rare gases, SOx, CS 2 , H 2 S, NOx, HCN, HCl, CHCl 3 , HF, volatile organic compounds and the following metals: mercury, arsenic, selenium, cadmium, iron and nickel and compounds derived from these metals; b) compressing the preheated gas stream to a pressure of between 10 and 50 bar; c) recovering a purified CO 2 -rich gas stream, in the liquid, gaseous or supercritical state; wherein a purification step is carried out between steps a) and b) utilizing at least one bed of adsorbents that are neutral to NOx and/or SOx and having adsorption properties enabling water to be at least partially eliminated in the presence of NOx and/or SOx.