Patent ID: 6545180
Filing Date: 2003-04-08
Classification: C07C

Abstract:
A batch process for producing sorbic acid comprising the step of decomposing a polyester at temperatures of 100Â° C. or less by action of hydrochloric acid, said polyester being obtained from ketene and crotonaldehyde, whereina peak temperature in the polyester decomposition step is controlled in a range of 80Â° C. to 100Â° C. and an aging procedure is performed at a temperature in a range from 75Â° C. to the peak temperature for 30 minutes to 2 hours after the reaction temperature reaches the peak temperature by adding a hydrochloric acid having a temperature lower than that of the polyester decomposition reaction mixture, said hydrochloric acid having a concentration of 24 to 30% by weight being added in an amount of 100 to 500 parts by weight relative to 100 parts by weight of the polyester to the reaction mixture after the initiation of the polyester decomposition reaction.