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. 06, 2009
Filed:
Mar. 17, 2006
Mahendra Pratap Saxena, Uttaranchal, IN;
Ashok Kumar Gupta, Uttaranchal, IN;
Satish Kumar Sharma, Uttaranchal, IN;
Dinesh Prasad Bangwal, Uttaranchal, IN;
Krishan Kumar, Uttaranchal, IN;
Mahendra Pratap Saxena, Uttaranchal, IN;
Ashok Kumar Gupta, Uttaranchal, IN;
Satish Kumar Sharma, Uttaranchal, IN;
Dinesh Prasad Bangwal, Uttaranchal, IN;
Krishan Kumar, Uttaranchal, IN;
Council of Scientific & Industrial Research, New Delhi, IN;
Abstract
The present invention provides a process for the preparation of p-toluic acid by liquid phase oxidation of p-xylene using oxygen or air as oxidant in the presence of p-toluic acid, water as solvent and cobalt salt or its combinations with salts of Ce, Mn as catalyst. Oxidation is carried out at 130-190° C. and pressure sufficient to keep water in liquid state. Oxidation step is followed by filteration to obtain p-toluic acid as major product. Untreated p-xylene is recovered and recycled and the catalyst is recovered from aqueous phase and is recycled.