Council of Scientific and Industrial Research

Sunil Sopana Tonde

Raghunath Vitthal Chaudhari

Ashutosh Anant Kelkar

Vilas Hari Rane

Sunil Sadashiv Divekar

Kalpendra Baburao Rajurkar

The present invention provides a liquid phase oxidation of toluene by using catalyst containing manganese (Manganese II acetate) in presence of Lewis acid (Stannous (II) chloride) and a bromide promoter (NaBr), at a temperature of 120&#xb0; C. and at a pressure of air in the range of 70-400 psig, in presence of carboxylic acid (acetic acid), as a solvent, to obtain high selectivity to benzaldehyde (76%). High activity was obtained with minimum byproducts such as benzoic acid, benzyl alcohol and benzyl acetate.

Process for the liquid phase oxidation of toluene to benzaldehyde

Methanol is reacted in presence of catalyst system comprising of an iron containing compound and a tin containing compound with or without an organic compound containing C, N, O, P, S, diamine, diketone, and or diphosphines as a ligand to produce acetic acid or methyl acetate. The reaction is effected in a solvent containing nitro or nitrite group.

Process for the preparation of acetic acid or methyl acetate

The present invention relates to a process for the preparation of a carboxylic acid by carbonylating the corresponding alcohol in carbon monoxide atmosphere and in the presence of water, a solvent, a palladium catalyst and a promoter system consisting of an organic or inorganic halide and an organic sulphonic acid, at a temperature in the range of 50-250&deg; C., at a pressure in the range of 50-2000 psig for 1 to 10 hours, the concentration of the catalyst being one mole of catalyst per every 50-50000 moles of the alcohol, the amount of the organic or inorganic halide being in the range of 5-500 moles per mole of the catalyst, and the amount of the organic sulphonic acid being in the range of 5-500 moles per mole of the catalyst, collecting the resulting product.

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Maharashtra, India

Sunil Sopana Tonde