Organic compounds -- part of the class 532-570 series – Organic compounds – Carboxylic acid esters
Patent
1986-11-10
1988-07-26
Lone, Werren B.
Organic compounds -- part of the class 532-570 series
Organic compounds
Carboxylic acid esters
203 38, 203 66, 562412, C07C 6748
Patent
active
047601655
ABSTRACT:
A method of recovering useful components at least containing dimethyl terephthalate from high-boiling byproducts occurring in the production of dimethyl terephthalate, which comprises oxidizing p-xylene and/or methyl p-toluate with a molecular oxygen-containing gas in the presence of a heavy metal oxidation catalyst, subjecting the resulting oxidation product to esterification with methanol, separating dimethyl terephthalate and esters having lower boiling points than dimethyl terephthalate from the esterification reaction product by distillation, and thereafter treating the distillation residue containing byproducts having higher boiling points than dimethyl terephthalate with methanol to recover at least dimethyl terephthalate from the treated product; wherein the treatment of the distillation residue with methanol is carried out at a temperature of 110.degree. to 240.degree. C. under a pressure sufficient to maintain methanol in the liquid phase.
REFERENCES:
patent: 4092481 (1978-05-01), Bunger
patent: 4096340 (1978-06-01), Fujii et al.
patent: 4126755 (1978-11-01), Bunger et al.
Fujii Takao
Hasegawa Hideo
Clarke Vera C.
Lone Werren B.
Teijin Petrochemical Industries Ltd.
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