Method of purifying propylene oxide
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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Abstract
A process for purifying propylene oxide characterized by subjecting a liquid reaction mixture containing propylene oxide, and water, hydrocarbons and oxygen-containing organic compounds as impurities obtained by reacting cumene hydroperoxide with propylene to extractive distillation using an extractant of a hydrocarbon having 7 to 20 carbon atoms with an extractive distillation column, and controlling a concentration of propylene glycol in the extractant supplied to the extractive distillation column to 20% by weight or less.
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4 Claims
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1. A process for purifying propylene oxide, which comprises:
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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, and controlling a concentration of propylene glycol contained in the extractant supplied into the extractive distillation column to 20% by weight or less, and wherein 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. - View Dependent Claims (2, 3, 4)
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Specification