Patent ID: 7605297

Claim:
A process for the extractive removal of optionally substituted phenol, 3-hydroxypyrazole, 2-hydroxypyridine, hydroquinone, resorcinol, catechol; C 1 -C 20 -alcohol, glycol, glycerol, optionally substituted aniline, N—C 1 -C 20 -alkylamine, N,N-di-C 1 -C 20 -alkylamine, P—C 1 -C 20 -alkylphosphine, P,P-di-C 1 -C 20 -alkylphosphine, phenylphosphine, diphenylphosphine, hydrazine, hydroxylamine, sulfonic acid, sulfinic acid, phosphoric acid, carboxylic acid or amino acid from aprotic solvents by means of ionic liquids of the formula [K] n + [A] n− , where n is 1, 2 or 3; [K]+ is selected from the group consisting of: quaternary ammonium cations of the formula [NR 1 , R 2 ,R 3 ,R 4 ] + (Ia), quaternary phosphonium cations of the formula [PR 1 , R 2 ,R 3 ,R 4 ] + (Ib), where R 1 , R 2 , R 3 , R 4 are each C 1 -C 12 -alkyl or phenyl-C 1 -C 4 -alkyl, where the aliphatic radicals may bear from 1 to 4 substitutents selected from the group consisting of halogen, amino, cyano, C 1 -C 4 -alkoxy and the phenyl ring may bear the abovementioned substitutents and also C 1 -C 6 -alkyl, carboxylate and sulfonate groups; R 1 and R 2 may together form a C 4 -C 5 -alkenylene radical which may be substituted by C 1 -C 4 -alkyl, halogen, cyano or C 1 -C 4 -alkoxy; imidazolium cations of the formula, pyridinium cations of the formula, pyrazolium cations of the formula, quinolinium cations of the formula, thiazolium cations of the formula, triazinium cations of the formula, where the index n and the substitutents R and R x have the following meanings: n is 0, 1, 2, 3 or 4; R is hydrogen, C 1 -C 12 -alkyl or phenyl-C 1 -C 4 -alkyl, where the aliphatic radicals may bear from 1 to 4 substitutents selected from the group consisting of halogen, amino, cyano, C 1 -C 4 -alkoxy and the phenyl ring may bear the abovementioned substitutents and also C 1 -C 6 -alkyl, carboxylate and sulfonate groups; R x is C 1 -C 6 -alkyl, halogen, amino, cyano, C 1 -C 4 -alkoxy, carboxylate or sulfonate; [A] n− is the partly or fully deprotonated anion of an inorganic or organic protic acid H n A (III), where n is a positive integer and indicates the charge on the anion.