Organic compounds -- part of the class 532-570 series – Organic compounds – Heterocyclic carbon compounds containing a hetero ring...
Patent
1982-07-01
1984-03-13
Raymond, Richard
Organic compounds -- part of the class 532-570 series
Organic compounds
Heterocyclic carbon compounds containing a hetero ring...
C07D30789
Patent
active
044369220
ABSTRACT:
A method for the manufacture of high-purity phthalic anhydride, which comprises exposing crude phthalic anhydride obtained by vapor-phase catalytic oxidation of ortho-xylene to contact with a gas containing molecular oxygen at an elevated temperature in the presence of an alkali metal salt of at least one carboxylic acid selected from the group consisting of maleic acid, succinic acid and benzoic acid, and optionally a manganese-containing alloy, and subsequently subjecting the resultant reaction mixture to distillation.
REFERENCES:
patent: 3201423 (1965-08-01), Landau et al.
patent: 4165324 (1979-08-01), Schroeder et al.
patent: 4234494 (1980-11-01), Schroeder et al.
Kita Yuichi
Sakamoto Kentaro
Sato Takahisa
Behr Omri M.
Nippon Shokubai Kagaku Kogyo & Co., Ltd.
Raymond Richard
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