Method of producing carboxylic acid
AssigneeToray Industries, Inc.
InventorsDaijiro Tsukamoto, Kenji Kawamura, Katsushige Yamada
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Abstract
Efficient production of a carboxylic acid is provided by a method of producing a carboxylic acid, which includes the following steps (A) and (B): (A) filtering a carboxylic acid-containing fermentation broth by passing said fermentation broth through a nanofiltration membrane, to obtain a carboxylic acid-containing filtrate from the permeate side of the membrane; and (B) extracting the carboxylic acid from the carboxylic acid-containing filtrate obtained in the step (A) using an extraction solvent which undergoes phase separation with the filtrate, and collecting a carboxylic acid extract phase-separated from the aqueous phase.
Claims4
A method of producing a carboxylic acid, comprising:
- (A′) removing insoluble substances from a carboxylic acid-containing fermentation broth;
- (A) filtering said insoluble substances-removed carboxylic acid-containing fermentation broth by passing said insoluble substances-removed carboxylic acid-containing fermentation broth through a nanofiltration membrane to obtain an aqueous carboxylic acid-containing filtrate that is free of organic solvent from a permeate side of said nanofiltration membrane and to accelerate phase separation between an aqueous phase and an organic phase in step (B);
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- (B) mixing said carboxylic acid-containing filtrate obtained in step (A) with an extraction solvent which undergoes the phase separation with said carboxylic acid-containing filtrate, and collecting a carboxylic acid extract phase-separated from the aqueous phase.
Dependencies are inferred from the claim text.