Recovery of dimethyl terephthalate and intermediates from the tarry fraction of cooxidation process residue
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United States of America Patent
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Oct 7, 1980
Grant Date -
N/A
app pub date -
Oct 13, 1978
filing date -
Oct 13, 1978
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Expired
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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.
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