# US 5,352,807 A · Propylene oxide purification

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- Number: US 5,352,807 A
- Document ID: US5352807A
- Status: Granted
- Kind: A
- Application number: 08/147,253
- Filed: 1993-11-04
- Granted: 1994-10-04
- Earliest claimed: 1992-02-20
- Assignees: Arco Chemical Technology, L.P.
- Inventors: T. Thomas Shih
- Web page: https://patentgrep.com/patent/US5352807A

## CPC

- C07D 301/32: Separation; Purification
- C07D: HETEROCYCLIC COMPOUNDS (macromolecular compounds C08)

## Abstract

The method for the separating close-boiling impurities from propylene oxide essentially free of high molecular weight poly (propylene oxide) which comprises contacting the impure propylene oxide with solid activated carbon adsorbent and separating propylene oxide reduced in impurities content from the adsorbent.

## Claims

### Claim 1

The method of purifying propylene oxide prepared by reaction of an organic hydroperoxide with propylene and containing less than 0.05 ppm by weight of poly (propylene oxide) having a molecular weight of at least 50,000 and containing contaminating amounts of one or more of methyl formate, acetaldehyde, propionaldehyde and C.sub.4 -C.sub.7 hydrocarbon impurities which comprises contacting a liquid mixture of said propylene oxide and impurity with a solid activated carbon absorbent and separating propylene oxide having a reduced impurity content from the absorbent.