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:
Sep. 10, 2002
Filed:
Aug. 22, 2000
Keith Michael Kreitman, Houston, TX (US);
Steve Edward Brewer, Houston, TX (US);
John Bernard Rodden, Houston, TX (US);
Robert Lawrence Blackbourn, Houston, TX (US);
Thomas Fairchild Brownscombe, Houston, TX (US);
James Laurel Buechele, Houston, TX (US);
Ye-Mon Chen, Sugar Land, TX (US);
Zaida Diaz, Houston, TX (US);
Donn Anthony DuBois, Houston, TX (US);
Raymond Lawrence June, Singapore, SG;
Brendan Dermot Murray, Houston, TX (US);
Michael Wayne Potter, Sugar Land, TX (US);
Mossi & Ghisolfi Overseas, S. A., Luxembourg, LU;
Abstract
Disclosed is an integrated process for producing 2,6-naphthalene dicarboxylicacid comprising oxidizing a methylnaphthalene feedstock, hydrodebrominating the crude naphthoic acid product under conditions different from any work known in the art, forming a potassium salt of the acid; disproportionating the potassium salt to produce 2,6 potassium salts of NDA; selectively precipitating K NDA; selectively precipitating the monopotassium salt of 2,6 NDA(KHNDA); disproportionating the KHNDA into 2,6 NDA and K2NDA; further reacting the 2,6 NDA in a pipe reactor; and drying the product 2,6 NDA by conventional means or directly slurrying directly into a PEN process. The process can tolerate impurities in the economical methylnaphthalene feed and the resulting 2,6 NDA is of high quality with <50 ppm potassium.