L'air Liquide, Soci&#xe9;t&#xe9; Anonyme Pour L'etude Et L'exploitation Des Proc&#xe9;d&#xe9;s Georges Claude

L'air Liquide, Societe Anonyme a Directoire Et Conseil De Surveillance Pour L'etude Et L'exploitation Des Procedes Georges Claude

L'air Liquide, Societe Anonyme Pour L'etude Et L'exploitation Des

L'air Liquide

Georges Kraus

Cyrille Millet

Jean-Pierre Gabillard

Philippe Bourgeois

Serge Moreau

Patrick Le Bot

Alain Guillard

Philippe Fraysse

Lian-Ming Sun

Process for purifying air by adsorption over a barium-exchanged zeolite

The regeneration phase of the adsorption cycle includes a depressurization step, a heating/elution step, during which the bed is purged with a hot heating/elution gas, and a cooling/elution step, during which the bed is purged with a cold cooling/elution gas. The cooling/elution step is terminated while the cooling/elution gas leaving the bed is at a temperature markedly higher than the temperature of the gas to be treated and the adsorption phase comprises an initial adsorption step during which the bed is cooled down to the low adsorption temperature due to the effect of the gas to be treated.

Process for the treatment of a gas by temperature swing adsorption

A process, particularly of the TSA type, for separating impurities of the nitrogen protoxide (N,O) and possibly carbon dioxide (CO,) or ethylene (C,H,) type which are contained in a gas stream, such as air. The impurities of nitrogen protoxide type are removed on a faujasite zeolite having a Si/Al ratio of 1 to 1.5 and containing from 0 to 35% of K,cations, between 1 and 99% of Na,cations and between 1 and 99% of Ca,cations, preferably at least 50% of Ca,cations. The separation is preferably carried out at a temperature of approximately &minus;40&deg; C. to &plus;80&deg; C., preferably at room temperature. Advantageously, the process is employed for prepurifying atmospheric air before cryogenic distillation of the air thus prepurified.

Process for purifying a gas stream of its N2O impurities

Process for separating at least carbon dioxide (CO,) contained in a gas stream, preferably air, in which at least carbon dioxide is adsorbed on a zeolite-X having a Si/Al ratio of approximately 1 to 1.5 and containing at most 35% of K,cations, between 1 and 99% of Na,cations and at most 99% of Ca,cations. This process is carried out at a temperature ranging from &minus;40&deg; C. to &plus;80&deg; C. Optionally, impurities chosen from water vapour and hydrocarbons, particularly ethylene, are also removed. The air thus purified is then capable of being cryogenically distilled.

Process for purifying air by adsorption before cryogenic distillation

A plant and a process for the purification and cryogenic separation of air containing impurities, which process is carried out according to the steps of (a) compressing the air; (b) introducing the air compressed in step (a) into one or more adsorption vessels containing particles of adsorbent without, beforehand, precooling the air; (c) adsorbing the impurities (CO,, H,O, NOx, SOx, etc) contained in the air on the particles of adsorbent at room temperature and at a pressure of at least 11.4 bar, preferably ranging from 20.1 to 40 bar; (d) cooling the air purified in step (c) down to a cryogenic temperature; and (e) cryogenically distilling the cooled air in order to produce nitrogen, oxygen, argon or mixtures thereof.

Process and plant for the purification and cryogenic separation of air without precooling

Process and apparatus for the purification of a gaseous flow containing at least one impurity which can be carbon dioxide, water vapor and/or hydrocarbon. The impurity is adsorbed on a bed of adsorbent containing at least one adsorbent material, it being possible to use stacked adsorbent beds. Atop the uppermost bed is a layer of particulate ballast having a density greater than that of the adsorbent. The bed of ballast exerts a mechanical pressure on the subjacent adsorbent and prevents fluidization of the upper portion of the subjacent adsorbent. As a result, the rate of gas flow through the adsorbent can be increased.

Process and device for purification of gas by adsorption with fixed

Process for purifying an air flow containing carbon dioxide (CO.sub.2) and water vapour, in which at least some of the CO.sub.2 and water vapour impurities are removed by adsorbing the impurities on at least one calcined alumina containing at most 10% by weight of at least one alkali or alkaline-earth metal oxide, the adsorption being carried out at a temperature of between -10.degree. C. and 80.degree. C.

Growing community of inventors

Paris, France

Georges Kraus