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A method of operating a thermal swing adsorption process by determining a parameter relating to the water content of a feed gas, selecting process conditions for regeneration of the adsorbent in the thermal swing adsorption process based on the parameter and modifying the regeneration process condit

A method of operating a thermal swing adsorption process by determining a parameter relating to the water content of a feed gas, selecting process conditions for regeneration of the adsorbent in the thermal swing adsorption process based on the parameter and modifying the regeneration process conditions to accord with the selected process conditions for regeneration is disclosed. Apparatus for effecting this adsorption method and apparatus in which regeneration conditions are modified based on the actual ambient water content of the feed gas are also disclosed.

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A method of operating a thermal swing adsorption process by determining a parameter relating to the water content of a feed gas, selecting process conditions for regeneration of the adsorbent in the thermal swing adsorption process based on the parameter and modifying the regeneration process condit

A method of operating a thermal swing adsorption process by determining a parameter relating to the water content of a feed gas, selecting process conditions for regeneration of the adsorbent in the thermal swing adsorption process based on the parameter and modifying the regeneration process conditions to accord with the selected process conditions for regeneration is disclosed. Apparatus for effecting this adsorption method and apparatus in which regeneration conditions are modified based on the actual ambient water content of the feed gas are also disclosed. lkyl groups substituted with a nitrogen-containing group, phenyl groups, and 4'-aminophenyl groups; R2is chosen from hydrogen, C1-C4alkyl groups, monohydroxy(C1-C4alkyl) groups, polyhydroxy-(C2-C4alkyl) groups, (C1-C4)alkoxy(C1-C4)alkyl groups, and C1-C4alkyl groups substituted with a nitrogen-containing group; R3is chosen from hydrogen, halogens, C1-C4alkyl groups, monohydroxy (C1-C4alkyl) groups, hydroxy(C1-C4alkoxy) groups, acetylamino(C1-C4alkoxy) groups, mesylamino(C1-C4alkoxy) groups, and carbamoylamino (C1-C4alkoxy) groups; R4is chosen from hydrogen, halogens, and C1-C4alkyl groups. 11. The composition according to claim 10, wherein when R1is a halogen, said halogen is chosen from chlorine, bromine, iodine and fluorine. 12. The composition according to claim 10, wherein said para-phenylenediamines of formula (I) are chosen from para-phenylenediamine, para-tolylenediamine, 2-chloro-para-phenylenediamine, 2,3-dimethyl-para-phenylenediamine, 2,6-dimethyl-para-phenylenediamine, 2,6-diethyl-para-phenylenediamine, 2,5-dimethyl-para-phenylenediamine, N,N-dimethyl-para-phenylenediamine, N,N-diethyl-para-phenylenediamine, N,N-dipropyl-para-phenylenediamine, 4-amino-N,N-diethyl-3-methylaniline, N,N-bis(β-hydroxyethyl)-para-phenylenediamine, 4-N,N-bis(β-hydroxyethyl)amino-2-methyl-aniline, 4-N,N-bis(β-hydroxyethyl)amino-2-chloroaniline, 2-β-hydroxyethyl-para-phenylenediamine, 2-fluoro-para-phenylenediamine, 2-isopropyl-para-phenylenediamine, N-(β-hydroxypropyl)-para-phenylenediamine, 2-hydroxymethyl-para-phenylene-diamine, N,N-dimethyl-3-methyl-para-phenylenediamine, N,N-(ethyl-β-hydroxyethyl)-para-phenylenediamine, N-(β,γ-dihydroxy propyl)-para-phenylenediamine, N-(4'-aminophenyl)-para-phenylenediamine, N-phenyl-paraphenylenediamine, 2-β-hydroxyethyl oxypara-phenylenediamine, 2-β-acetylaminoethyloxy-para-phenylenediamine, N-(β-methoxyethyl)-para-phenylenediamine, and their acid addition salts. 13. The composition according to claim 9, wherein said double bases are chosen from compounds of the following formula (II), and their acid addition salts: in which: Z1and Z2,which may be identical or different, are each chosen from hydroxyl groups and an --NH2group, each of which may be optionally substituted with a group Lchosen from C1-C4alkyl groups and a linking arm Y; the linking arm Y is chosen from linear and branched alkylene groups comprising from 1 to 14 carbon atoms, which optionally may be interrupted by, or which optionally may end with at least one nitrogen-containing group and/or at least one heteroatom, and which optionally may be substituted with at least one group chosen from hydroxyl groups and C1-C6alkoxy groups; R5and R6,which may be identical or different, are each chosen from hydrogen, halogens, C1-C4alkyl groups, monohydroxy(C1-C4alkyl) groups, polyhydroxy-(C2-C4alkyl) groups, (C1-C4alkyl) groups, and a linking arm Y; R7,R8,R9,R10,R11,and R12,which may be identical or different, are each chosen from hydrogen, a linking arm Y, and (C1-C4alkyl) groups; wherein the compounds of formula (II) contain only one linking arm Y per molecule. 14. The composition of claim 13, wherein said at least one heteroatom of the linking arm Y is chosen from oxygen, sulfur, and nitrogen. 15. The composition according to claim 13, wherein said double bases of formula (II) are chosen from N,N'-bis(βR-hydroxyethyl)-N,N'- bis(4'-amino-phenyl)-1,3-diaminopropanol, N,N'-bis(β-hydroxyethyl)-N,N'-bis(4'-aminophenyl)ethylenediamine, N,N'-bis(4-aminophenyl)tetramethylenediamine, N,N'-bis(β-hydroxyethyl)-N,N'-bis-(4-aminophenyl)tetramethylenediamine, N,N'-bis(4-methylaminophenyl)tetramethylenediamine, N,N'-bis(ethyl)-N,N'-bis(4'-amino-3'-methylphenyl)ethylenediamine, 1,8-bis(2,5-diaminophenoxy)-3,5-dioxaoctane, and the acid addition salts of said double bases. 16. The composition according to claim 9, wherein said para-aminophenols are chosen from the compounds of formula (III), and their acid addition salts: in which: R13is chosen from hydrogen, halogens, C1-C4alkyl groups, monohydroxy(C1-C4alkyl) groups, (C1-C4)alkoxy(C1-C4)-alkyl groups, amino(C1-C4alkyl) groups, and hydroxy (C1-C4)alkylamino-(C1-C4alkyl) groups; R14is chosen from hydrogen, halogens, C1-C4alkyl groups, monohydroxy (C1-C4alkyl) groups, polyhydroxy(C2-C4alkyl) groups, amino(C1-C4alkyl) groups, cyano(C1-C4alkyl) groups, and (C1-C4)alkoxy(C1-C4)alkyl groups; wherein at least one of R13or R14is a hydrogen atom. 17. The composition according to claim 16, wherein said para-aminophenols of formula (III) are chosen from para-aminophenol, 4-amino-3-methylphenol, 4-amino-3-fluorophenol, 4-amino-3-hydroxymethylphenol, 4-amino-2-methylphenol, 4-amino-2-hydroxymethylphenol, 4-amino-2-methoxy methylphenol, 4-amino-2-aminomethylphenol, 4-amino-2-(β-hydroxy-ethylaminomethyl)phenol, 4-amino-2-fluorophenol, and their acid addition salts. 18. The composition according to claim 9, wherein said ortho-aminophenols are chosen from 2-aminophenol, 2-amino-5-methylphenol, 2-amino-6-methylphenol, 5-acetamido-2-aminophenol, and their acid addition salts. 19. The composition according to claim 9, wherein said heterocyclic bases are chosen from pyridine derivatives, pyrimidine derivatives, pyrazole derivatives, pyrazolopyrimidine derivatives, and their acid addition salts. 20. The composition according to claim 1, wherein said at least one colorant is present in a concentration ranging from about 0.0005% to about 12% by weight of the total weight of said composition. 21. The composition according to claim 1, wherein said at least one colorant is present in a concentration ranging from about 0.005% to about 6% by weight of the total weight of said composition. 22. The composition according to claim 1, wherein said at least one coupler is present in a concentration ranging from about 0.0001% to about 8% by weight of the total weight of said composition. 23. The composition according to claim 1, wherein said at least one coupler is present in a concentration ranging from about 0.005% to 5% by weight of the total weight of said composition. 24. The composition according to claim 1, further comprising at least one additional coupler different from 2-amino-3-hydroxypyridine and/or at least one direct dye. 25. The composition according to claim 1, wherein said acid addition salts of said at least one oxidation base are chosen from hydrochlorides, hydrobromides, sulphates, tartrates, lactates, and acetates. 26. The composition according to claim 1, wherein said acid addition salts of said at least one coupler are chosen from hydrochlorides, hydrobromides, sulphates, tartrates, lactates, and acetates. 27. The composition according to claim 1, further comprising at least one carrier appropriate for dyeing keratinous fibers. 28. The composition according to claim 26, wherein said at least one carrier is chosen from water and organic solvents. 29. The composition according to claim 1, wherein said composition has a pH ranging from about 4 to about 11. 30. A method of