Method of preparing ionic liquids

Abstract

In the process for preparing ionic liquids, an ionic liquid is firstly reacted with an alkoxide or with barium hydroxide and is subsequently neutralized with an acid. The ionic liquid contains a phosphonium and/or ammonium cation and an anion selected from the group consisting of halides, arylsulfonates, alkylsulfonates, sulfate, hydroxysulfate, alkylsulfates, hydrogencarbonate, carbonate. triflate and carboxylates. In this process, virtually any anions can be introduced into the ionic liquids.

1 . A process for modifying ionic liquids containing a phosphonium and/or ammonium cation as cation and an anion selected from the group consisting of halides, arylsulfonates, alkylsulfonates, sulfate, hydrogensullate, alkylsulfates, hydrogencarbonate, carbonate, trillates and carboxylates, wherein the ionic liquids are then reacted with an alkoxide or a hydroxide in a first process step. resultimi, in strongly basic ionic liquids, and the strongly basic ionic liquids are neutralized with an acid in a second process step. 
     
     
         2 . The process according to  claim 1 , wherein alcohol formed in the neutralization when alkoxides are used is removed by distillation after the neutralization carried out in the second process step. 
     
     
         3 . The process according to  claim 1 , wherein the precipitated solid is separated off after the first process step. 
     
     
         4 . The process according to  claim 1 , wherein the ionic liquid contains a heterocyclic cation. 
     
     
         5 . The process according to  claim 4 , wherein the ionic liquid contains an imidazolium cation. 
     
     
         6 . The process according to  claim 1 , wherein, in the second process step, the strongly basic ionic liquid is neutralized with an acid to a pH corresponding to the equivalence point of the corresponding acid-based pair. 
     
     
         7 . The process according to  claim 1 , wherein the reaction in the first process step takes place at a temperature from 5 to 100° C. 
     
     
         8 . The process according to  claim 1 , wherein the reaction in the second process step takes place at a temperature of from −10 to 100° C. 
     
     
         9 - 12 . (canceled) 
     
     
         13 . The process according to  claim 2 , wherein the precipitated solid is separated off after the first process step. 
     
     
         14 . The process according to  claim 2 , wherein the ionic liquid contains a heterocyclic cation. 
     
     
         15 . The process according to  claim 3 , wherein the ionic liquid contains a heterocyclic cation. 
     
     
         16 . The process according to  claim 2 , wherein, in the second process step, the strongly basic ionic liquid is neutralized with an acid to a pH corresponding to the equivalence point of the corresponding, acid-based pair. 
     
     
         17 . The process according to  claim 3 , wherein, in the second process step, the strongly basic ionic liquid is neutralized with an acid to a pH corresponding to the equivalence point of the corresponding acid-based pair. 
     
     
         18 . The process according to  claim 4 , wherein, in the second process step, the strongly basic ionic. liquid is neutralized with an acid to a pH corresponding to the equivalence point of the corresponding acid-based pair. 
     
     
         19 . The process according to  claim 5 , wherein, in the second process step, the strongly basic ionic liquid is neutralized with an acid to a corresponding to the equivalence point of the corresponding'acid-based pair. 
     
     
         20 . The process according to  claim 2 , wherein the reaction in the first process step takes place at a temperature from 5 to 100° C.