Patent ID: 6528668
Filing Date: 2003-03-04
Classification: C07C,C07D

Abstract:
A method for separating and recovering an &ohgr;-hydroxy-(&ohgr;-3)-ketoaliphatic acid represented by the general formula (10) and an alkaline metal salt of long-chain dicarboxylic acid represented by the general formula (8) comprising adjusting the pH value of a mixture containing an alkaline metal salt of &ohgr;-hydroxy-(&ohgr;-3)-ketoaliphatic acid represented by the general formula (5) and the alkaline metal salt of long-chain dicarboxylic acid represented by the general formula (8) to 5 to 7 with a mineral acid: wherein n is an integer of 7 to 13 and M is an alkaline metal salt; wherein n is an integer of 7 to 13 and M is an alkaline metal salt; wherein n is an integer of 7 to 13.