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Title: Purification of carboxylic acids by complexation with selective solvents

Abstract

A method and apparatus for purifying carboxylic acids is disclosed. A mixture containing crude carboxylic acid is contacted with a selective crystallization solvent to form a slurry of a salt complex of the carboxylic acid and the selective crystallization solvent. The salt complex is recovered and optionally processed to recover the free carboxylic acid. The method and apparatus of the invention is particularly suitable for purifying aromatic dicarboxylic acids such as terephthalic acid. The present invention also reduces contamination by carboxybenaldehyde isomers in crude phthalic acids by oxidizing the carboxybenzaldehyde to the corresponding phthalic acid.

Inventors:
;
Issue Date:
Research Org.:
GTC Technology, Inc., Houston, TX (United States)
Sponsoring Org.:
USDOE
OSTI Identifier:
1531544
Patent Number(s):
7,307,188
Application Number:
11/102,242
Assignee:
GTC Technology Inc. (Houston, TX)
DOE Contract Number:  
FC36-011D14085
Resource Type:
Patent
Resource Relation:
Patent File Date: 2005-04-08
Country of Publication:
United States
Language:
English

Citation Formats

Wytcherley, Randi Wright, and Chou, Tai-Li. Purification of carboxylic acids by complexation with selective solvents. United States: N. p., 2007. Web.
Wytcherley, Randi Wright, & Chou, Tai-Li. Purification of carboxylic acids by complexation with selective solvents. United States.
Wytcherley, Randi Wright, and Chou, Tai-Li. Tue . "Purification of carboxylic acids by complexation with selective solvents". United States. https://www.osti.gov/servlets/purl/1531544.
@article{osti_1531544,
title = {Purification of carboxylic acids by complexation with selective solvents},
author = {Wytcherley, Randi Wright and Chou, Tai-Li},
abstractNote = {A method and apparatus for purifying carboxylic acids is disclosed. A mixture containing crude carboxylic acid is contacted with a selective crystallization solvent to form a slurry of a salt complex of the carboxylic acid and the selective crystallization solvent. The salt complex is recovered and optionally processed to recover the free carboxylic acid. The method and apparatus of the invention is particularly suitable for purifying aromatic dicarboxylic acids such as terephthalic acid. The present invention also reduces contamination by carboxybenaldehyde isomers in crude phthalic acids by oxidizing the carboxybenzaldehyde to the corresponding phthalic acid.},
doi = {},
journal = {},
number = ,
volume = ,
place = {United States},
year = {2007},
month = {12}
}

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Works referenced in this record:

Method and apparatus for preparing purified terephthalic acid
patent, November 1998


Method and apparatus for preparing purified terephthalic acid and isophthalic acid from mixed xylenes
patent, April 2000


Method for purifying isophthalic acid prepared from metaxylene
patent, October 2000


Method of recovering carboxylic acids from dilute solutions
patent, February 1996


Method and apparatus for preparing purified terephtalic acid
patent, June 1998


Method to reduce carboxybenzaldehyde isomers in terephthalic acid or isophthalic acid
patent, July 1999


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