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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.:

US 5169977 B1

PDFFull Text
Date of Patent:
Dec. 08, 1992

Filed:

Mar. 14, 1991

Process for purifying dimethyl-2,6-naphthalene dicarboxylate

Applicant:
Inventors:

Toru Tanaka, Okayama, JP;

Masami Matsumoto, Okayama, JP;

Atsushi Ozaki, Okayama, JP;

Hideaki Fujita, Okayama, JP;

Assignee:

Mitsubishi Gas Chemical Company, Inc., Tokyo, JP;

Attorney:

Browdy and Neimark

Primary Examiner:

Jose G Dees

Assistant Examiner:

Vera C Clarke

Int. Cl.
CPC ...
C07C / ;
U.S. Cl.
CPC ...
560 78 ; 562486 ; 562487 ;
Abstract

A process for purifying crude 2,6-naphthalene dimethyl dicarboxylate (hereinunder referred to as 2,6-NDM) which comprises dissolving the crude 2,6-NDM into a C.sub.6 -C.sub.9 aromatic hydrocarbon, then contacting the solution of 2,6-NDM and the hydrocarbon with an hydrotalcite-like laminar crystalline compound and activated carbon, then carrying out thermal filtration of the solution, and then cooling the solution to separate 2,6-NDM crystal from the solution is disclosed.

Find Patent Forward Citations

Tanaka, Toru. (1992). Process for purifying dimethyl-2,6-naphthalene dicarboxylate (U.S. Patent No. 5169977). U.S. Patent and Trademark Office. https://idiyas.com/patent/badge/5169977

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