CN200580049288: 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.
Patent No:
CN200580049288
Application No:
200580049288
Filing Date:
26-09-2007
Issue Date:
11-07-2012
Applicant:
CSIR-Indian Institute of Petroleum (CSIR-IIP), Dehradun
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