Patent ID: 8808430

Claim:
A process for purifying a gas mixture G-0 comprising dinitrogen monoxide, at least comprising the steps of (A) treating the gas mixture G-0 comprising dinitrogen monoxide to obtain a gas mixture G-A, at least comprising the steps of (i) absorbing the gas mixture G-0 in a solvent mixture S-I to obtain an offgas stream and a composition C-A and (ii) desorbing a gas mixture G-1 from the composition C-A to obtain a solvent mixture S-I′ and optionally comprising the steps (iii) absorbing the gas mixture G-1 in a solvent mixture S-II to obtain an offgas stream and a composition C-B and (iv) desorbing a gas mixture G-2 from the composition C-B to obtain a solvent mixture S-II′, wherein when step (A) does not comprise any further steps after step (ii), the composition of the gas mixture G-A is identical to the composition of the gas mixture G-1, and wherein when step (A) comprises steps (iii) and (iv), the composition of the gas mixture G-A is identical to the composition of the gas mixture G-2, (B) condensing the gas mixture G-A to obtain a liquid composition C-1 comprising dinitrogen monoxide and a gaseous mixture G-K, wherein the gaseous mixture G-K is recycled into the treatment according to step (A).