| abstract |
The invention relates to a process for the preparation of free carboxylic acids comprising the process steps A) preparation of carboxylic acid by a biological cell located in an aqueous medium with addition of an amine of the general formula (I) (see formula I) where R1, R2 and R3, independently of one another, are identical or different, branched or unbranched, optionally substituted hydrocarbon radicals or H, B) for cases where the added amine in process step A) is water-soluble, addition of a water-insoluble amine of the general formula (I), where, in process step A) or B), a multiphase system is obtained and the corresponding ammonium carboxylate is formed from the water-insoluble amine and the carboxylic acid, and C) removal of the water-insoluble phase and D) heating of the water-insoluble phase with release of free carboxylic acid. |