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

Wilfrid Petrie

Christian Monereau

Yves Engler

Xavier Vigor

Christian Barbe

Michel Eclancher

A pressure swing adsorption unit comprises at least two absorbers, each absorber having at least a port connectable to at least one pumping unit. The pumping unit includes a first pumping stage and a second pumping stage. Each of the pumping stages are capable of discharging into an outlet conduit. A circuit is provided for selectively and alternately connecting a port to a source of feed gas and to the pumping unit such that the first and second pumping stages are sequentially fluidly connected in parallel, and then in series to reduce the pressure at the port to an intermediate vacuum level, and then to a low vacuum level.

Pressure swing adsorption unit

A process for treating a gaseous mixture, particularly air, by pressure swing adsorption (PSA), of the type in which three adsorbers (1 to 3) are used in each of which is carried out, for a given nominal production, a cycle comprising the following successive stages, the cycle being offset from one adsorber to the other by a third of the nominal duration (T) of the cycle:

Process for the treatment of a gaseous mixture by adsorption with

Process for the combined production of nitrogen and oxygen with

Process for the production of a gas with a substantial oxygen content

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Wilfrid Petrie