Council of Scientific and Industrial Research

Vilas Hari Rane

Raghunath Vitthal Chaudhari

Ashutosh Anant Kelkar

Chandrashekhar Vasant Rode

Vivek Vinayak Ranade

Anil Kisan Kinage

Savita Kiran Shingote

Lalita Sanjib Roy

Rengaswamy Jaganathan

Manisha Madhukar Telkar

Vasant Ramchandra Choudhary

Amarjeet M Rajput

Dhananjay Ravindra Mote

Raj Madhukar Deshpande

Sunil Sadashiv Divekar

Sunil Sopana Tonde

Raghunath Vittal Chaudhari

Amit Arwind Deshmukh

Nayana Tushar Nivangune

Vikas Shripat Kshirsagar

Kalpendra Baburao Rajurkar

The present invention discloses a process for recovery and regeneration of rare earth metals or salts thereof used as catalyst and which is conveniently integrated within the overall flow sheets of manufacturing dialkyl carbonates. Alkyl carbamate, alcohol and a rare earth metal salt as catalyst selected from the lanthanide series are added in a reactor to afford dialkyl carbonate. The rare earth metal catalyst is selected from samarium, cerium, lanthanum, neodymium, ytterbium, europium and gadolinium. Ammonia is added to a portion of the reaction mixture to precipitate the catalyst and the separated deactivated catalyst is dissolved in acid to afford regenerated catalyst, e.g., in triflic acid in the case of samarium triflate catalyst.

Process for recovery and regeneration of deactivated catalysts used in dialkyl carbonate synthesis

The present invention discloses a process for the synthesis of aromatic carbamates from amine with dialkyl carbonate in the presence of binary or ternary mixed metal oxide catalyst. The present invention further discloses the yield of said aromatic carbamate in the range of 60 to 99%. Further, the ratio of amine to dialkyl carbonate is in the range of 1:2 to 1:30.

Process for the synthesis of aromatic carbamates

The invention relates to synthesis of methyl carbamate (MC) and dimethyl carbonate (DMC) in presence of stripping inert gas or superheated methanol vapors using packed column reactor and bubble column reactor.

Synthesis of methyl carbamate and dimethyl carbonate (DMC) in presence of stripping with inert gas or superheated vapours and a reactor for the same

The present invention discloses an improved catalyst free process for synthesis of alkyl carbamates in an integrated system comprising a tubular reactor and a striper. The process comprises reacting urea and an alcohol in said tubular reactor under autogeneous pressure; wherein said process provides &#x3e;90% selectivity towards alkyl carbamate. The mixture of urea and alcohol is N fed to the tubular reactor at a particular feed rate. The tubular reactor is heated externally under autogeneous pressure to carry out a synthesis reaction producing alkyl carbamate and ammonia. The ammonia is removed from the tubular reactor by the striper. The tubular reactor and the stripper are arranged in series to reduce the equilibrium limitations of the reaction and drive the reaction in forward direction.

Configuration and its use in process for synthesis of alkyl carbamates from alkyl alcohol and urea in a tubular reactor

The patent discloses a process for the synthesis of dialkyl carbonates catalyzed by a catalyst composition AB oxides, wherein A and B are rare earth metals or A and B are combination of rare earth and transition metals with ratios ranging from 0.5:10 to 10:0.5.

Process for the synthesis of dialkyl carbonates

The invention relates to synthesis of methyl carbamate (MC) and dimethyl carabonate (DMC) in presence of stripping inert gas or superheated methanol vapors using packed column reactor and bubble column reactor.

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

The present invention provides a process for the production of a mixture of alcohols and ketones by the liquid phase oxidation of higher alkanes using a catalyst system consisting of transition group metal such as palladium and support such as alumina, silica, carbon, preferably carbon in the presence of alkyl hydroperoxide as oxygen carrier, under stirring conditions at a temperature range of 10&#xb0;&#x2013;120&#xb0; C. and at atmospheric pressure in a stirred glass reactor for a period of 1&#x2013;30 h. The present invention produces a mixture of alcohols and ketones with high selectivity (preferably 60&#x2013;90%) along with other byproducts such as diketones and acids.

Process for preparation of a mixture of alcohols and ketones by liquid phase oxidation of higher alkanes

The present invention provides an improved process for the liquid phase oxidation of toluene to benzaldehyde with high selectivity and good activity in an organic acid medium using a catalyst system consisting of transition metal/metals and bromide as a promoter in the presence of lean oxygen.

Selective liquid phase oxidation of toluene to benzaldehyde

The present invention provides an improved process for preparation of 2-phenyl ethanol. More specifically, the present invention relates to a process for preparing 2-phenyl ethanol by catalytic transfer hydrogenation of styrene oxide, in the presence of a supported transition metal catalyst. The catalyst system comprises of a palladium supported on silica, alumina, clay or charcoal.

Process for preparation of 2-phenyl ethanol

A hydrogenation catalyst of the general formula AB(y)C(z) wherein A is a support comprising of a salt of a Group II A metal or zeolite, B is a noble metal selected from Pt or Pd, y&equals;0.2 to 10%, C is nickel and z&equals;0 to 15.0%, with the proviso that when B is Pt, z&equals;0.

Noble metal containing hydrogenation catalyst for selective hydrogenation of 1, 4 butynediol to 1, 4 butenediol, and a process for the preparation thereof

The present invention relates to a process for the conversion of 1,4 butynediol to 1,4 butanediol or a mixture of 1,4 butanediol and 1,4 butenediol comprising hydrogenating an aqueous solution of 1,4 butynediol using platinum supported CaCO catalyst at a temperature in the range of 20-190&deg; C. under a hydrogen pressure in the range between 5-100 bar and collecting the product by any known method.

Process for the conversion of 1, 4 butynediol to 1, 4 butanediol, or a mixture of 1, 4 butenediol and 1,4 butanediol

A process for the preparation of 1,4 butenediol comprising hydrogenating an aqueous solution of 1,4 butynediol under stirring conditions over a supported platinum or palladium and nickel catalyst in basic medium at a temperature in the range of 20-110&deg; C. and pressure in the range between 200-700 psig till the reaction is completed, cooling the reaction mixture to room temperature and separating the catalyst by known methods to obtain 1,4 butenediol.

Process for the conversion of 1,4 butynediol to 1,4 butenediol

A process for the production of propylene and ethylene by non-catalytic oxidative conversion of propane by allowing the endothermic hydrocarbon cracking reaction to occur simultaneously with the exothermic hydrocarbons oxidative conversion reactions in an empty tubular reactor is disclosed. The process comprises mixing of oxygen and propane at ambient temperatures, mixing of sulfur compound with steam, admixing the mixture of steam and sulfur compound and the mixture of oxygen and propane and preheating the resulting admixture, passing said mixture through an empty tubular reactor, cooling and separating the components of effluent product gases by known methods and recycling the unconverted reactants, if required.

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Vilas Hari Rane