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Purification of propylene oxide by distillation

  • US 3,909,366 A
  • Filed: 06/28/1972
  • Issued: 09/30/1975
  • Est. Priority Date: 09/07/1967
  • Status: Expired due to Term
First Claim
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1. A PROCESS FOR PURIFYING PROPYLENE OXIDE CONTAINING AS IMPURITIES HYDROCARBONS HAVING 5 TO 7 CARBON ATOMS WHICH COMPRISES EXTRACTIVELY DISTILLING SAID IMPURE PROPYLENE OXIDE WITH AN EXTRACTIVE DISTILLATION SOLVENT CONSISTING ESSENTIALLY OF A MONO-CYCLIC HYDROCARBON HAVING 6 TO 12 CARBON ATOMS AND HAVING A MELTING POINT BELOW 50*C IN AN EXTRACTIVE DISTILLATION COLUMN WHEREIN SAID PROPYLENE OXIDE IS INTRODUCED INTO SAID EXTRACTIVE DISTILLATION COLUMN, SAID AROMATIC HYDROCARBON IS INTRODUCED INTO SAID COLUMN AS A SEPARATE STREAM AT A POINT HIGHER THAN THE POINT OF INTRODUCTION OF SAID PROPYLENE OXIDE, PURIFIED PROPYLENE OXIDE IS REMOVED AS A DISTILLATE FROM SAID EXTRACTIVE DISTILLATION COLUMN, AND SAID AROMATIC HYDROCARBON ENRICHED IN SAID HYDROCARBON IMPUITIES IS REMOVED AS BOTTOMS FROM SAID EXTRACTIVE DISTILLATION VOLUMN.

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