METHOD FOR MANUFACTURING HIGH-PURITY TETRACHLOROPHTHALIC ANHYDRIDE

METHOD FOR MANUFACTURING HIGH-PURITY TETRACHLOROPHTHALIC ANHYDRIDE

PROBLEM TO BE SOLVED: To provide a method for industrially manufacturing a high-purity tetrachlorophthalic anhydride whose HCB content is reduced as low as possible. SOLUTION: The method for manufacturing a high-purity tetrachlorophthalic anhydride comprises manufacturing tetrachlorophthalic anhydri...

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Bibliographische Detailangaben
Hauptverfasser: TAKASHIMA CHIHIRO, HAMABE NOBUHIKO, NOMOTO EIGO
Format: Patent
Sprache:eng
Schlagworte:
APPARATUS THEREFOR
CHEMISTRY
GENERAL METHODS OF ORGANIC CHEMISTRY
HETEROCYCLIC COMPOUNDS
METALLURGY
ORGANIC CHEMISTRY
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Zusammenfassung:PROBLEM TO BE SOLVED: To provide a method for industrially manufacturing a high-purity tetrachlorophthalic anhydride whose HCB content is reduced as low as possible. SOLUTION: The method for manufacturing a high-purity tetrachlorophthalic anhydride comprises manufacturing tetrachlorophthalic anhydride by subjecting phthalic anhydride to a nuclear chlorination reaction using chlorine gas in the presence of iodine or iodine chloride in a chlorosulfonic acid solvent. In the reaction, the reaction temperature is controlled at 50-150 deg.C, and the thermal point of the reaction is controlled at a degree of chlorination of 3.90-3.98.