Organic compounds -- part of the class 532-570 series – Organic compounds – Carboxylic acids and salts thereof
Reexamination Certificate
2007-03-27
2007-03-27
Lilling, Herbert J. (Department: 1657)
Organic compounds -- part of the class 532-570 series
Organic compounds
Carboxylic acids and salts thereof
C435S140000, C210S511000, C210S634000
Reexamination Certificate
active
10839663
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. Solvent mixtures formed of such a modified solvent with a desired co-solvent, preferably a low boiling hydrocarbon, 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.
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Clausen Edgar C.
Gaddy James L.
Ko Ching-Whan
Wade Leslie E.
Wikstrom Carl V.
Bioengineering Resources, Inc.
Celanese International Corporation
Howson & Howson LLP
Lilling Herbert J.
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