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Method of purifying propylene oxide

  • US 7,285,187 B2
  • Filed: 02/07/2003
  • Issued: 10/23/2007
  • Est. Priority Date: 02/15/2002
  • Status: Expired due to Term
First Claim
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1. A process for purifying propylene oxide, which comprises:

  • subjecting a liquid reaction mixture containing propylene oxide obtained by a reaction of cumene hydroperoxide with propylene, and water, hydrocarbons and oxygen-containing organic compounds as impurities to extractive distillation using a linear or branched saturated or unsaturated hydrocarbon having 7 to 20 carbon atoms as an extractant, with an extractive distillation column,recycling the extractant after separating propylene oxide and then purifying for separating the impurities, andcontrolling a concentration of propylene glycol contained in the extractant supplied into the extractive distillation column to 20% by weight or less, andwherein the liquid reaction mixture to be subjected to purification is one obtained by subjecting a reaction liquid obtained by reaction of cumene hydroperoxide with propylene after recovery of propylene to crude distillation to separate propylene oxide from cumene and cumyl alcohol.

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