Method for extracting impurities using ionic liquids
AssigneeBASF SE
InventorsMatthias Maase, Manuel Budich, Georg Groβmann, Laszlo Szarvas
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Abstract
The invention relates to a process for the extractive removal of phenols, alcohols, amines, phoshines, hydroxylamines, hydrazines, oximes, imines, water, carboxylic acids, amino acids, hydroxamic acids, sulfinic acids, sulfonic acids, peroxycarboxylic acids, phosphonous acids, phosphinous acids, phosphonic acids, phosphinic acids or phosphoric acids from aprotic solvents by means of ionic liquids of the formula [K]n+[A]n−, where n, [K]+ and An− are defined as in the description.
Claims20
A process for the extractive removal of optionally substituted phenol, 3-hydroxypyrazole, 2-hydroxypyridine, hydroquinone, resorcinol, catechol;
- C1-C20-alcohol, glycol, glycerol, optionally substituted aniline, N—C1-C20-alkylamine, N,N-di-C1-C20-alkylamine, P—C1-C20-alkylphosphine, P,P-di-C1-C20-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 [NR1, R2,R3,R4]+ (Ia),
- quaternary phosphonium cations of the formula [PR1, R2,R3,R4]+ (Ib),
- where
- R1, R2, R3, R4 are each C1-C12-alkyl or phenyl-C1-C4-alkyl, where the aliphatic radicals may bear from 1 to 4 substitutents selected from the group consisting of halogen, amino, cyano, C1-C4-alkoxy and the phenyl ring may bear the abovementioned substitutents and also C1-C6-alkyl, carboxylate and sulfonate groups;
- R1 and R2 may together form a C4-C5-alkenylene radical which may be substituted by C1-C4-alkyl, halogen, cyano or C1-C4-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 Rx have the following meanings:
- n is 0, 1, 2, 3 or 4;
- R is hydrogen, C1-C12-alkyl or phenyl-C1-C4-alkyl,
- where the aliphatic radicals may bear from 1 to 4 substitutents selected from the group consisting of halogen, amino, cyano, C1-C4-alkoxy and the phenyl ring may bear the abovementioned substitutents and also C1-C6-alkyl, carboxylate and sulfonate groups;
- Rx is C1-C6-alkyl, halogen, amino, cyano, C1-C4-alkoxy, carboxylate or sulfonate;
- [A]n−is the partly or fully deprotonated anion of an inorganic or organic protic acid HnA (III), where n is a positive integer and indicates the charge on the anion.
Dependencies are inferred from the claim text.