Recovery of dimethyl terephthalate and intermediates from the ta

Details Recovery of dimethyl terephthalate and intermediates from the ta Recovery of dimethyl terephthalate and intermediates from the ta

1978-10-13

1980-10-07

Myers, Jane S.

Organic compounds -- part of the class 532-570 series

Organic compounds

Carboxylic acid esters

560 78, C07C 6982

Patent

active

042270103

ABSTRACT:
Disclosed is a process for recovering dimethyl terephthalate and intermediate products from the tarry fraction of the residue generated in the production of dimethyl terephthalate from p-xylene and methanol by the cooxidation procedure. In the process the tarry fraction is established in admixture with a catalytic quantity of alkali metal material, examples of which are sodium and potassium carbonate, at about 200.degree.-350.degree. C., and the resulting reaction mixture is maintained in this temperature range until at least a substantial quantity of dimethyl terephthalate has formed. Generally, dimethyl terephthalate and intermediate products are separated from the reaction mixture. The separation in preferred embodiments is by distillation.

REFERENCES:
patent: 3914287 (1975-10-01), Takeda et al.
Groggins, Unit Processes in Organic Synthesis, pp. 616-618, (1952).

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