Process for purification of naphthalenedicarboxylic acid
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United States of America Patent
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Sep 6, 1994
Grant Date -
N/A
app pub date -
Nov 30, 1992
filing date -
Dec 3, 1991
priority date (Note) -
Expired
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Abstract
A process for purifying a crude naphthalenedicarboxylic acid containing impurities and coloring substances obtained by the oxidation of a di-substituted naphthalene, dispense with the use of a large amount of alkali or acid, and producing a naphthalenedicarboxylic acid having a high purity and good color effectively and in a high recovery is disclosed, which comprises dissolving the crude naphthalenedicarboxylic acid in a mixed solvent comprising an amine compound and an alcohol and conducting crystallization.
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