Process for purifying propanediol-1,3

• US 5,008,473 A
• Filed: 09/17/1987
• Issued: 04/16/1991
• Est. Priority Date: 09/24/1986
• Status: Expired due to Fees

• Current Assignee: Ruhrchemie AG A Corporation
• Original Assignee: Ruhrchemie Aktiengesellschaft (Sanofi )
• Inventors: Breitkopf, Norbert, Bach, Hanswilhelm, Dambkes, Georg
• Primary Examiner(s): Evans, J. E.
• Application Number:
  US07/098,047
• Time in Patent Office: 1,307 Days
• Field of Search: 568/868
• US Class Current: 568/868
• CPC Class Codes: C07C 29/86 by liquid-liquid treatment
• CPC Class Codes: C07C 31/205 1,3-Propanediol; 1,2-Propanediol

Abstract

A process for the purification of propanediol-1,3, especially when produced by hydration of acrolein with water, including extracting the diol with cyclohexane. Preferably, from 2 to 10 parts by weight of cyclohexane per part by weight of diol is used. The purification is usually carried out below 60° C.

Claims

1. A process for the purification of turbid propanediol-1,3, produced by hydration of acrolein with water followed by hydrogenation, said process comprising extracting said diol with cyclohexane.

2. The process of claim 1 wherein there are 2 to 10 parts by weight of cyclohexane per part by weight of said diol.

3. The process of claim 2 wherein there are 4 to 6 parts by weight of cyclohexane per part by weight of said diol.

4. The process of claim 1 wherein said purification is carried out below about 60°

C.

5. The process of claim 3 wherein said purification is carried out from about 20°

C. to about 60°

C.