Patent FR-2892322-A1 (FR)
Title: Pressure swing adsorption for producing hydrogen enriched gaseous fraction from feedstock gas, comprises introducing the gas into an adsorber to adsorb the gas in a high pressure of cycle, and terminating the introduced gas in the adsorber
Inventor: MONEREAU CHRISTIAN
IPC: B01D53/047
Filed: 2005-10-24
Abstract: The pressure swing adsorption for producing hydrogen enriched gaseous fraction from feedstock gas, comprises introducing the feedstock gas into an adsorber to adsorb the feedstock gas in a high pressure of a cycle, terminating the introduced gas in the adsorber and depressurizing the introduced gas with a co-current of the adsorber to recover equilibrium gas of pressure and an elution gas, depressurizing the gas in the counter-current of the adsorber, eluting the adsorber, and repressurizing the adsorber by a generated sub-fraction. The pressure swing adsorption for producing hydrogen enriched gaseous fraction from feedstock gas, comprises introducing the feedstock gas into an adsorber to adsorb the feedstock gas in a high pressure of a cycle, terminating the introduced gas in the adsorber and depressurizing the introduced gas with a co-current of the adsorber to recover equilibrium gas of pressure and an elution gas, depressurizing the gas in the counter-current of the adsorber, eluting the adsorber, and repressurizing the adsorber by a generated sub-fraction during the depressurization of the gas with the co-current and by the feedstock gas and/or by the hydrogen enriched gas. Pressure of the cycle is lower than the high pressure of the cycle to desorb a part of constituent gas adsorbed during the introduction of the gas. The elution of the adsorber takes place by eluting the gas and the hydrogen enriched gas. In the termination stage, the two pressure equilibriums are terminated by pressure P1 and P2 in which the pressure P1 is less than P2. The eluted gas is released from the adsorber with the pressure lower or equal to P2. Additional fraction of the hydrogen rich elution gas is removed from the adsorber with the pressure higher than P1. In the eluting stage, the additional hydrogen enriched gas fraction is subsequently operated with the elution gas. Part of the hydrogen enriched gaseous fraction is produced during the introduction of the feedstock gas into the adsorber, which is used to perform the elution with a hydrogen rich gas. In the stage of eluting the adsorber, the additional elution is carried out with the hydrogen enriched gas fraction, which is produced by the introduction of the feedstock gas into the adsorber. In the repressurization of the adsorber, the hydrogen enriched gas fraction is produced during the introduction of the feedstock gas into the adsorber. The produced hydrogen enriched gas fraction is used to carry out the elution with hydrogen enriched gas during eluting and repressurizing of the adsorber in which the produced hydrogen enriched gas fraction is maintained constant. The additional elution is originating from the gas pipeline/piping network, and storage capacity or hydrogen generator. The quantity of the additional elution gas is regulated with respect to the demand of hydrogen in which the elution of the gas partly passes through the gaseous storage capacity.