Recovering useful components at least containing dimethyl terephthalate from high-boiling byproducts occurring in the production of dimethyl terephthalate
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United States of America Patent
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Jul 26, 1988
Grant Date -
N/A
app pub date -
Nov 10, 1986
filing date -
Nov 13, 1985
priority date (Note) -
Expired
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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.
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