PROCESSES FOR PRODUCING POLYESTER AND PRODUCING SORBIC ACID

Title:

PROCESSES FOR PRODUCING POLYESTER AND PRODUCING SORBIC ACID

Document Type and Number:

WIPO Patent Application WO/2000/018819

Kind Code:

A1

Abstract:

A process for producing a polyester which comprises reacting a ketene with crotonaldehyde having a purity of 95 wt.% or higher. The unreacted crotonaldehyde remaining in the resultant reaction mixture may be recovered from the mixture and recycled to the reaction system. The crotonaldehyde to be fed to the system has an $g(a)-vinylcrotonaldehyde content of, e.g., below 0.5 wt.%, and a paraldehyde content of, e.g., below 5 wt.%. The polyester obtained by the process is decomposed with, for example, hydrochloric acid to efficiently obtain sorbic acid having an excellent hue.

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Inventors:

KAMEI NOBORU (JP)
YAMASHITA AKIRA (JP)
KOUNO MITSUHIRO (JP)

Application Number:

PCT/JP1999/005124

Publication Date:

April 06, 2000

Filing Date:

September 21, 1999

Export Citation:

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Assignee:

DAICEL CHEM (JP)
KAMEI NOBORU (JP)
YAMASHITA AKIRA (JP)
KONO MITSUHIRO (JP)

International Classes:

C07C51/09; C07C57/10; C08G63/00; C08G63/40; (IPC1-7): C08G63/00; C07C51/09; C07C57/10

Foreign References:

JPH1095745A	1998-04-14
JPH1087795A	1998-04-07
JPH09227447A	1997-09-02
JPH0532583A	1993-02-09
JPH0291039A	1990-03-30
JPS62195341A	1987-08-28
JPS482528B1	1973-01-25
JPS4730638B1	1972-08-09
JPS4536315B1	1970-11-18
JPS455789B1	1970-02-26

Other References: