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:
Aug. 19, 2014
Filed:
Feb. 01, 2010
Alexander Schraven, Issum, DE;
Thomas Tacke, Alzenau, DE;
Thomas Haas, Muenster, DE;
Christoph Kobler, Alzenau, DE;
Dieter Buss, Aschaffenburg, DE;
Axel Ronneburg, Erlensee, DE;
Olivier Zehnacker, Recklinghausen, DE;
Alexander Schraven, Issum, DE;
Thomas Tacke, Alzenau, DE;
Thomas Haas, Muenster, DE;
Christoph Kobler, Alzenau, DE;
Dieter Buss, Aschaffenburg, DE;
Axel Ronneburg, Erlensee, DE;
Olivier Zehnacker, Recklinghausen, DE;
Evonik Degussa GmbH, Essen, DE;
Abstract
The invention relates to an improved method for releasing an organic acid, preferably a carbon, sulfone or phosphone acid, particularly an alpha or beta hydroxycarbon acid, from the ammonia salt thereof by releasing and removing ammoniac and simultaneous extraction of the released acid, having an amine as a suitable extraction means from the aqueous phase. This method corresponds to a reactive extraction. The reactive extraction of an organic acid from the aqueous ammonia salt solution thereof can be significantly improved by the use of a strip medium or carrier gas, such as nitrogen, air, water vapor or inert gases such as argon. The released ammoniac is removed from the aqueous solution by the continuous gas flow and can be resupplied into a production process. The free acid can be obtained by a method such as distillation, rectification, crystallization, reextraction, chromatography, adsorption or by a membrane method from the extraction means.