Organic compounds -- part of the class 532-570 series – Organic compounds – Carboxylic acids and salts thereof
Patent
1992-11-30
1994-09-06
Dees, Jose
Organic compounds -- part of the class 532-570 series
Organic compounds
Carboxylic acids and salts thereof
562412, C07C 5143
Patent
active
053449690
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.
REFERENCES:
patent: 2849483 (1958-08-01), Ham
patent: 2949483 (1960-08-01), Ham
Iwane Hiroshi
Shirasaki Miwa
Sugawara Takahiro
Clarke Vera C.
Dees Jose
Mitsubishi Petrochemical Co. Ltd.
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