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US 7,919,631 B2Granted
Production of ionic liquids
AssigneeEastman Chemical Company
InventorsCharles Michael Buchanan, Norma Lindsey Buchanan
Life of this patent
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Abstract
Ionic liquids and processes and apparatus for their production. The ionic liquids can be low sulfur and low halide carboxylated ionic liquids. The ionic liquids can be produced via formation of at least one intermediate carboxylated ionic liquid, and thereafter subjecting the intermediate carboxylated ionic liquid to at least one anion exchange process.
Claims21
A process for making a carboxylated ionic liquid, said process comprising:
- contacting an alkyl amine formate ionic liquid with an anhydride under conditions sufficient to convert said alkyl amine formate ionic liquid into said carboxylated ionic liquid via anion exchange, wherein said carboxylated ionic liquid contains sulfur in an amount less than 200 ppmw and halides in an amount less than 200 ppmw.
Dependencies are inferred from the claim text.