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. 23, 2013
Filed:
Nov. 21, 2005
Philip O. Nubel, Naperville, IL (US);
Muin S. Haddad, Naperville, IL (US);
Jeffrey J. Foster, Sr., Bolingbrook, IL (US);
Ricky L. Wittman, Aurora, IL (US);
Philip O. Nubel, Naperville, IL (US);
Muin S. Haddad, Naperville, IL (US);
Jeffrey J. Foster, Sr., Bolingbrook, IL (US);
Ricky L. Wittman, Aurora, IL (US);
BP Corporation North America Inc., Houston, TX (US);
Abstract
Impure aromatic carboxylic acids such as are obtained by liquid phase oxidation of feed materials comprising aromatic compounds with substituent groups oxidizable to carboxylic acid groups, or comprising aromatic carboxylic acid and one or more aromatic carbonyl impurities that form hydrogenated species more soluble in aqueous solvents or with less color or color-forming tendencies than the aromatic carbonyl impurity, are purified to an aromatic carboxylic acid product with lower levels of impurities by a process comprising contacting an aqueous solution comprising the impure aromatic carboxylic acid with hydrogen at elevated temperature and pressure with an attrition-resistance, acid stable catalyst composition comprising at least one hydrogenation catalyst metal and a support comprising relatively high surface area silicon carbide.