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:
Jul. 10, 2006
Filed:
Sep. 06, 1999
James L. Gaddy, Fayetteville, AR (US);
Edgar C. Clausen, Fayetteville, AR (US);
Ching-whan Ko, Fayetteville, AR (US);
Leslie E. Wade, Pearland, TX (US);
Carl V. Wikstrom, Benton, AR (US);
James L. Gaddy, Fayetteville, AR (US);
Edgar C. Clausen, Fayetteville, AR (US);
Ching-Whan Ko, Fayetteville, AR (US);
Leslie E. Wade, Pearland, TX (US);
Carl V. Wikstrom, Benton, AR (US);
Bioengineering Resources, Inc., Fayetteville, AR (US);
Celanese International Corporation, Dallas, TX (US);
Abstract
A modified water-immiscible solvent useful in the extraction of acetic acid from aqueous streams is a substantially pure mixture of isomers of highly branched di-alkyl amines. This solvent is substantially devoid of mono-alkyl amines and alcohols. Solvent mixtures formed of such a modified solvent with a desired cosolvent, preferably a low boiling hydrocarbon which forms an azeotrope with water are useful in the extraction of acetic acid from aqueous gaseous streams. An anaerobic microbial fermentation process for the production of acetic acid employs such solvents, under conditions which limit amide formation by the solvent and thus increase the efficiency of acetic acid recovery. Methods for the direct extraction of acetic acid and the extractive fermentation of acetic acid also employ the modified solvents and increase efficiency of acetic acid production. Such increases in efficiency are also obtained where the energy source for the microbial fermentation contains carbon dioxide and the method includes a carbon dioxide stripping step prior to extraction of acetic acid in solvent.