METHOD FOR REFINING TEREPHTHALIC ACID

PROBLEM TO BE SOLVED: To reduce combustion loss of acetic acid when producing crude terephthalic acid and enable reuse of water when refining the crude terephthalic acid. SOLUTION: The refining method comprises dissolving crude terephthalic acid in water at high temperature under pressure, oxidizing...

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Bibliographische Detailangaben
Hauptverfasser:	ONO TATSUYA, NAKAO FUJIMASA
Format:	Patent
Sprache:	eng
Schlagworte:	ACYCLIC OR CARBOCYCLIC COMPOUNDS APPARATUS THEREFOR CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOIDCHEMISTRY CHEMISTRY CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION ORPROCESSING OF GOODS GENERAL METHODS OF ORGANIC CHEMISTRY GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS METALLURGY ORGANIC CHEMISTRY PERFORMING OPERATIONS PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINSTCLIMATE CHANGE THEIR RELEVANT APPARATUS TRANSPORTING
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Beschreibung
Zusammenfassung:	PROBLEM TO BE SOLVED: To reduce combustion loss of acetic acid when producing crude terephthalic acid and enable reuse of water when refining the crude terephthalic acid. SOLUTION: The refining method comprises dissolving crude terephthalic acid in water at high temperature under pressure, oxidizing an impurity in the crude terephthalic acid with an oxygen-containing gas in the presence of a metal oxide catalyst, subsequently hydrogenating the treated impurity with a hydrogen-containing gas in the presence of a noble metal-based catalyst and crystallizing terephthalic acid by depressing pressure and carrying out solid-liquid separation of the crystal. COPYRIGHT: (C)2007,JPO&INPIT