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A pressure swing adsorption process which comprises introducing a feed gas mixture into an inlet of an adsorber vessel during a feed period, wherein the feed gas mixture contains a more strongly adsorbable component and a less strongly adsorbable component and the adsorber vessel contains a bed of a

A pressure swing adsorption process which comprises introducing a feed gas mixture into an inlet of an adsorber vessel during a feed period, wherein the feed gas mixture contains a more strongly adsorbable component and a less strongly adsorbable component and the adsorber vessel contains a bed of adsorbent material which selectively adsorbs the more strongly adsorbable component, and withdrawing a product gas enriched in the less strongly adsorbable component from an outlet of the adsorber vessel during at least a portion of the feed period, wherein a dimensionless cycle-compensated mass transfer coefficient defined as K tfeedVads/Vfeedis maintained in the range of about 23 to about 250.

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A pressure swing adsorption process which comprises introducing a feed gas mixture into an inlet of an adsorber vessel during a feed period, wherein the feed gas mixture contains a more strongly adsorbable component and a less strongly adsorbable component and the adsorber vessel contains a bed of a

A pressure swing adsorption process which comprises introducing a feed gas mixture into an inlet of an adsorber vessel during a feed period, wherein the feed gas mixture contains a more strongly adsorbable component and a less strongly adsorbable component and the adsorber vessel contains a bed of adsorbent material which selectively adsorbs the more strongly adsorbable component, and withdrawing a product gas enriched in the less strongly adsorbable component from an outlet of the adsorber vessel during at least a portion of the feed period, wherein a dimensionless cycle-compensated mass transfer coefficient defined as K tfeedVads/Vfeedis maintained in the range of about 23 to about 250. halogen atoms; it being understood that the SO2group is not directly linked to the nitrogen atom carrying the radical R4or R6; it being understood that the --(C=O)-- group is not directly linked to the nitrogen atom carrying the radical R6; it being understood that the radicals R4,R6and R8do not contain a peroxide bond or diazo, nitro and nitroso radicals; it being understood that the radicals R4,R6and R8cannot represent a hydroxyl radical, a thio radical, an amino radical, an alkoxy radical, or an alkylthio radical; R5and R7,which are identical or different, represent a hydrogen atom; a group Z as defined below; or a radical comprising from 1 to 20 carbon atoms, wherein the radical may be linear or branched, wherein the branch(es) may form one or more carbon-containing rings comprising from 3 to 7 members, wherein the radical may contain bond chosen from one or more double bonds and one or more triple bonds, wherein the double bonds may lead to aromatic groups, wherein one or more carbon atoms of the radical may be replaced with an oxygen, nitrogen, or sulphur atom or with an SO2group, and wherein the carbon atoms of the radical may, independently of each other, be substituted with one or more halogen atoms; it being understood that the said radicals R5and R7do not contain peroxide bonds or diazo, nitro and nitroso radicals; it being understood that R5cannot represent a hydroxyl radical or a thio radical; it being understood that R7cannot represent a thio radical; it being understood that the radicals R4and R5on the one hand, and the radicals R6and R8on the other hand, can, in addition, be linked to form, independently of each other, a saturated or unsaturated ring comprising from 5 to 7 members, the members being chosen from carbon, nitrogen and acyl, each member being unsubstituted or substituted with 1 or 2 radicals R, which are identical or different, R being a C1-C8alkyl radical, wherein the radical may be linear or branched, wherein the branch(es) may form one or more rings comprising from 3 to 7 members, wherein the radical may contain bonds chosen from one or more double bonds and one or more triple bonds, wherein the double bonds may lead to aromatic groups, wherein one or more carbon atoms of the radical may be replaced with an oxygen, nitrogen, or sulphur atom or with an SO2group, and wherein the carbon atoms of the radical may, independently of each other, be substituted with one or more halogen atoms; the said ring containing no peroxide bonds or diazo, nitro and nitroso radicals; Z is a cationic group represented by the following formula (II): wherein: n can take the value 0 or 1; B represents an alkyl radical comprising from 1 to 15 carbon atoms, wherein the radical may be linear or branched, wherein the branch(es) may form one or more rings comprising from 3 to 7 members, wherein the radical may contain bonds chosen from one or more double bonds and one or more triple bonds, wherein the double bonds may lead to aromatic groups, and wherein one or more carbon atoms in the radical may be replaced with an oxygen, nitrogen or sulphur atom or with an --SO2radical; and wherein one or more carbon atoms in the radical may, independently of each other, be substituted with one or more halogen atoms or with one or more groups Z; the said radical B containing no peroxide bond or diazo, nitro, or nitroso radicals; D is chosen from the cationic groups of the following formulae (III) and (IV): wherein: p and q can, independently of each other, take the value 0 or 1; the radical B is linked to the group D by any one of the atoms of the radical D; when n=0 and q=0, then the group of formula (IV) can be linked to the compound of for