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1. WO2000018716 - PROCESS FOR THE PREPARATION OF SORBIC ACID OR SALTS THEREOF

Publication Number WO/2000/018716
Publication Date 06.04.2000
International Application No. PCT/JP1999/005125
International Filing Date 21.09.1999
IPC
C07C 51/09 2006.1
CCHEMISTRY; METALLURGY
07ORGANIC CHEMISTRY
CACYCLIC OR CARBOCYCLIC COMPOUNDS
51Preparation of carboxylic acids or their salts, halides, or anhydrides
09from carboxylic acid esters or lactones
C07C 51/47 2006.1
CCHEMISTRY; METALLURGY
07ORGANIC CHEMISTRY
CACYCLIC OR CARBOCYCLIC COMPOUNDS
51Preparation of carboxylic acids or their salts, halides, or anhydrides
42Separation; Purification; Stabilisation; Use of additives
47by solid-liquid treatment; by chemisorption
CPC
C07C 51/09
CCHEMISTRY; METALLURGY
07ORGANIC CHEMISTRY
CACYCLIC OR CARBOCYCLIC COMPOUNDS
51Preparation of carboxylic acids or their salts, halides or anhydrides
09from carboxylic acid esters or lactones
C07C 51/47
CCHEMISTRY; METALLURGY
07ORGANIC CHEMISTRY
CACYCLIC OR CARBOCYCLIC COMPOUNDS
51Preparation of carboxylic acids or their salts, halides or anhydrides
42Separation; Purification; Stabilisation; Use of additives
47by solid-liquid treatment; by chemisorption
Applicants
  • DAICEL CHEMICAL INDUSTRIES, LTD. [JP]/[JP] (AllExceptUS)
  • YAMASHITA, Akira [JP]/[JP] (UsOnly)
  • KOUNO, Mitsuhiro [JP]/[JP] (UsOnly)
Inventors
  • YAMASHITA, Akira
  • KOUNO, Mitsuhiro
Agents
  • GOTO, Yukihisa
Priority Data
10/27565829.09.1998JP
Publication Language Japanese (ja)
Filing Language Japanese (JA)
Designated States
Title
(EN) PROCESS FOR THE PREPARATION OF SORBIC ACID OR SALTS THEREOF
(FR) PROCEDE DE PREPARATION D'ACIDE SORBIQUE OU DE SELS D'ACIDE SORBIQUE
Abstract
(EN) A process for the preparation of sorbic acid or salts thereof by decomposing a polyesther prepared from ketene and crotonaldehyde, which comprises the step of subjecting a solution of sorbic acid or a salt thereof as formed by the decomposition to treatment with a chemical-activated carbon. This treatment is conducted under the conditions of, e.g., pH 5.8-7.5 and 30-80 °C. This process permits efficient removal of colored substances, thus giving high-quality sorbic acid excellent in hue easily and in a high yield.
(FR) L'invention concerne un procédé de préparation d'acide sorbique ou de sels d'acide sorbique, par décomposition d'un polyester préparé à partir d'un cétène et d'un crotonaldéhyde. Le procédé consiste à soumettre une solution d'acide sorbique ou sel d'acide sorbique provenant de cette décomposition à un traitement effectué avec un carbone activé chimiquement. Ce traitement est réalisé dans des conditions de pH compris entre 5,8 et 7,5 et de température comprise entre 30 et 80 °C. Ce procédé permet de retirer efficacement des substances colorées, et donc de produire facilement un acide sorbique de haute qualité ayant une excellente teinte et un haut rendement.
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