Process for preparing ionic liquids by anion exchange
AssigneeBASF SE
InventorsMichael Klein, Michael Siemer, Diana Fürst, Günter Forster
Life of this patent
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Abstract
Process for preparing salts K+ X−, where K+ is an organic cation and X− is an anion, by anion exchange, wherein a salt K+ Y−, where K+ is as defined above and Y− is an organic anion having a carboxylate, sulfonate or sulfate group, is used as starting material and K+ Y− is reacted with a hydrogen acid HX whose pKa is less than the pKa of the hydrogen acid HY and after the reaction, the salt K+ X− obtained and the hydrogen acid HY obtained are present in separate liquid phases.
Claims12
A process for preparing salts K+ X−, where K+ is an organic cation and X− is an anion, by anion exchange, wherein
- a salt K+ Y−, where K+ is as defined above and Y− is an organic anion having a carboxylate, sulfonate or sulfate group, is used as starting material and
- K+ Y− is reacted with a hydrogen acid HX whose pKa is less than the pKa of the hydrogen acid HY and
- after the reaction, the salt K+ X− obtained and the hydrogen acid HY obtained are present in separate liquid phases.
A process for preparing imidazolium salts K+ X−, where K+ is a 1,3-disubstituted imidazolium cation and X− is an anion, wherein
- a) an imidazolium salt K+ Y− is firstly prepared by reaction of an α-dicarbonyl compound, an aldehyde, an amine and the hydrogen acid HY and
- b) the imidazolium salt K+ Y− obtained in this way is reacted with a hydrogen acid HX whose pKa is less than the pKa of the hydrogen acid HY and
- after the reaction, the salt K+ X− obtained and the hydrogen acid HY obtained are present in separate liquid phases.
Dependencies are inferred from the claim text.