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:
Jul. 14, 2015
Filed:
Oct. 12, 2012
Uop Llc, Des Plaines, IL (US);
Boreskov Institute of Catalysis, Novosibirsk, RU;
Alakananda Bhattacharyya, Glen Ellyn, IL (US);
Nina Kuznetsova, Novosibirsk, RU;
Bair S. Bal'zhinimaev, Novosibirsk, RU;
UOP LLC, Des Plaines, IL (US);
BORESKOV INSTITUTE OF CATALYSIS SIBERIAN BRANCH OF THE RUSSIAN ACADEMY OF SCIENCES, Novosibirsk, RU;
Abstract
A process for oxidizing solid crude terephthalic acid is described. The process includes contacting solid crude terephthalic acid with a solvent comprising a carboxylic acid and one or more of an ionic liquid or ammonium acetate; a bromine source; a catalyst; and an oxidizing agent to produce solid purified terephthalic acid at a temperature of about 100 to about 210° C., and a pressure of about 2 to about 4.5 MPa, for a time of about 5 to about 60 min, and recovering the solid purified terephthalic acid.