Preparation and purification of ionic liquids and precursors

  • US 7,763,186 B2
  • Filed: 12/22/2006
  • Issued: 07/27/2010
  • Est. Priority Date: 06/21/2002
  • Status: Expired due to Fees
First Claim
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1. A method for preparing a substantially nonfluorescent composition comprising ionic liquid that is a molten salt having a melting temperature at or below 100°

  • C., comprising;

    heating a compound of the formula [cation-1][X] with charcoal or activated carbon, wherein X is a halide and [cation-1] is a quaternary ammonium cation of the formula

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