Council of Scientific and Industrial Research

General Electric Company

Huntsman International LLC

Ashutosh Anant Kelkar

Raghunath Vitthal Chaudhari

Vilas Hari Rane

Vivek Vinayak Ranade

Anil Kisan Kinage

Lalita Sanjib Roy

Savita Kiran Shingote

Sunil Sadashiv Divekar

Sunil Purushottam Gupte

Shrikant Kulkarni

Sunil Sopana Tonde

Subbareddiar Kanagasabapathy

Dhananjay Ravindra Mote

Eric James Pressman

Swaminathan Sivaram

Bahram Moasser

Rengaswamy Jaganathan

Paresh Laxmikant Dhepe

Chilukuri Ver Avadhani

Raghunath Vittal Chaudhari

Bhalchandra Mahadeo Bhanage

Sunil Shankar Joshi

Sunil Purushotham Gupte

Kausik Mukhopadhyay

Babasaheb Mansub Matsagar

Devidas S Kolhe

Devidas S Kolhe, Deceased

Subramaniam Radhakrishnan

Mohammed Shadbar Qureshi

Nandkumar Manikrao Patil

Subramanian Ganapathy

Rashmi Chansarkar

Sandip Kumar Singh

Nayana Tushar Nivangune

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 discloses a process for depolymerization of lignin to yield substituted phenolic monomers using Br&#xf6;nsted ionic liquid as catalyst under mild reaction conditions to obtain an overall yield of monomers up to 97%.

Process for depolymerization of lignin

The present invention relates to a process for the preparation of esters of hydroxy tiglic aldehydes which are the key intermediates for Vitamin-A acetate synthesis and various perfumistic products, said process relates to the hydroformylation of biscarboxylic esters of but-2-ene-1,4-diol, followed by deacetoxylation of its hydroformylation compound, in the presence of heterogeneous catalyst having rhodium complex entrapped, anchored or teethered on the acidic support, said acidic support causes deacetoxylation in the reaction mixture immediately after hydroformylation, to give 100% selectivity to the carboxylic esters of hydroxyl tiglic aldehydes in a single step.

Process for preparation of esters of hydroxy tiglic Aldehydes

Process for the synthesis of polyurethane derivatives from aromatic polyamine compounds. The method involves the reaction of an aromatic polyamine compound with CO and Oin the presence of a catalyst comprising a Group VIII or lanthanide metal on a solid support and a halogenide promoter.

Process for the synthesis of polycarbamates

The present invention provides a process for the preparation of arylamines comprises reacting aryl halide and aryl amine/heterocyclic amine. The said process is carried out in the presence of a solvent, catalyst and a base.

Process for the preparation of arylamines

The present invention provides an improved process for the production of carboxylic acids by the carbonylation of alcohol. The process involves contacting an alcohol with carbon monoxide in the presence of a nickel compound, a heterocyclic organic compound and an iodide promoter to produce the corresponding carboxylic acid. The improvement relates to the use of heterocyclic organic compound as a promoter containing at least two heteroatoms of which at least one is selected independently from S or N, which provides an inexpensive and stable catalyst system.

Process for the preparation of carboxylic acids from aliphatic alcohols

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

A process for preparation of alternating polyesteramides comprises reacting carbon monoxide, an aminohydroxy compound and an aromatic polyhalide having at least two halide atoms covalently bonded to an aromatic ring. The said process is conducted in the presence of a solvent, a catalyst and a base.

Process for the preparation of a polyesteramide

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.

Process for the preparation of a carboxylic acid

Polyesters may be prepared by reacting an amyl diiodide, an aliphatic or aryl diol and carbon monoxide in presence of a catalyst and an organic base. The process is preferentially carried out in a solvent. The catalyst is a heterogeneous catalyst containing a metal selected from a group containing Palladium, Platinum, Nickel and Cobalt. Following the formation of polyester, the catalyst can be easily separated and efficiently recycled.

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Maharashtra, India

Ashutosh Anant Kelkar