The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Apr. 22, 2014
Filed:
Apr. 29, 2009
Thomas Haas, Muenster, DE;
Thomas Tacke, Alzenau, DE;
Achim Marx, Gelnhausen, DE;
Alexander Schraven, Issum, DE;
Olivier Zehnacker, Recklinghausen, DE;
Eva Maria Wittmann, Traunreut, DE;
Thomas Haas, Muenster, DE;
Thomas Tacke, Alzenau, DE;
Achim Marx, Gelnhausen, DE;
Alexander Schraven, Issum, DE;
Olivier Zehnacker, Recklinghausen, DE;
Eva Maria Wittmann, Traunreut, DE;
Evonik Roehm GmbH, Darmstadt, DE;
Abstract
A process for the preparation of free carboxylic acids including: A) preparation of carboxylic acid by a biological cell located in an aqueous medium with addition of an amine of formula (I) where R, Rand R, independently of one another, are identical or different, branched or unbranched, optionally substituted hydrocarbon radicals or H; B) for cases where the added amine A) is water-soluble, addition of a water-insoluble amine of formula (I), where, in A) or B), a multiphase system is obtained and the corresponding ammonium carboxylate is formed from the water-insoluble amine and the carboxylic acid; C) removal of the water-insoluble phase; and D) heating of the water-insoluble phase with release of free carboxylic acid.