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US 7,410,586 B2Granted
Purification or work-up on ionic liquids by means of adsorptive separation processes
AssigneeBASF SE
InventorsYork Alexander Beste, Jürgen Ciprian, Stephan Maurer
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Abstract
Process for the work-up of a mixture comprising ionic liquids and a further substance, wherein the substance present is separated off by means of adsorptive separation processes.
Claims17
A process for purifying a mixture of at least one ionic liquid and at least one impurity,
- wherein the at least one impurity is a substance having a vapor pressure in the mixture that prohibits complete removal of the substance from the mixture by distillation, and/or
- wherein the at least one impurity is a substance that interacts with the at least one ionic liquid so as to prohibit complete removal of the substance from the mixture by distillation,
- said process comprising removing the at least one impurity from the mixture by continuous chromatographic process, and obtaining the resultant at least one ionic liquid.
A process according to claim, wherein the at least one impurity is a polar compound.
An adsorption separation process for removing an impurity from a mixture comprising an ionic liquid and the impurity,
- wherein the impurity is a substance having a vapor pressure in the mixture that prohibits complete removal of the substance from the mixture by distillation, and/or
- wherein the impurity is a substance that interacts with the ionic liquid so as to prohibit complete removal of the substance from the mixture by distillation,
- wherein the ionic liquid has an anion and cation, the cation comprising at least one five- or six-membered heterocycle containing at least one phosphorus or nitrogen atom;
- and
- wherein the process comprises a first step of contacting the contaminated ionic liquid with a resin, and a second step of separating the purified ionic liquid from the resin.
2 more elements
An adsorption separation process for removing at least one impurity from a contaminated ionic liquid,
- wherein the at least one impurity is a substance having a vapor pressure in a mixture comprising the at least one impurity and the at least one ionic liquid that prohibits complete removal of the substance from the mixture by distillation, and/or
- wherein the at least one impurity is a substance that interacts with the at least one ionic liquid in a mixture comprising the at least one impurity and the at least one ionic liquid so as to prohibit complete removal of the substance from the mixture by distillation,
- which process comprises
- providing the contaminated ionic liquid by
- (a) by separating volatile components from a mixture comprising the ionic liquid, the volatile components and the at least one impurity, by means of evaporation or rectification, and/or
- (b) separating non-polar components from a mixture comprising the ionic liquid, said the non-polar components and the at least one impurity, by means of extraction with a non-polar organic solvent,
- removing the at least one impurity from the contaminated ionic liquid by adsorptive separation, and
- obtaining the resultant at least one ionic liquid.
5 more elements
Dependencies are inferred from the claim text.