Patents

US7598415: Process for the preparation of p-toluic acid by liquid phase oxidation of p-xylene in water

The 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 130-1900 C and pressure sufficient to keep water in liquid state. Oxidation step is followed by filtration 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.

Filing Date: 17-03-2006

Issue Date: 06-10-2009

Applicant: CSIR-Indian Institute of Petroleum (CSIR-IIP), Dehradun

Patent No: US7598415

Application No: 11/378055

Inventor(s): Mahendra Pratap Saxena; Ashok Kumar Gupta; Satish Kumar Sharma; Dinesh Prasad Bangwal; Krishan Kumar

IPC Classification: C07C51/265

Country: United States of America

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