The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Oct. 07, 1980
Filed:
Oct. 13, 1978
Horace E Hood, Cecil County, MD (US);
Hercofina, Wilmington, NC (US);
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.