Council of Scientific and Industrial Research

Rengaswamy Jaganathan

Raghunath Vitthal Chaudhari

Chandrashekhar Vasant Rode

Vilas Hari Rane

Manisha Madhukar Telkar

Ashutosh Anant Kelkar

Sopan T Chaudhari

Raghunath Vittal Chaudhari

Devidas S Kolhe

The present invention provides a process for the preparation of an improved copper chromite catalyst for the hydrogenation of diethyl maleate to tetrahydrofuran with very high selectivity. This invention particularly relates to a process for the preparation of an improved copper chromite catalyst with specific composition and physical properties containing copper, chromium, zinc and aluminium as catalyst components in order to achieve selective production of tetrahydrofuran via single step hydrogenation of diethyl maleate. The calcination procedure has also been described to achieve the best activity. The catalyst has a life of more than 630 hours with constant activity. The used catalyst can also be regenerated to match the original hydrogenation activity.

Process for the preparation of copper chromite catalyst

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

The present invention provides a process for the preparation of an improved nickel-containing catalyst suitable for the conversion of alcohols to the corresponding carboxylic acid which involves combining a nickel compound, an N-containing organic compound and an iodine promoter, bringing the combination in contact with an alcohol in the presence of carbon monoxide and subjecting the mixture to a temperature and pressure sufficient to initiate carbonylation of the alcohol. The process is characterized in that the N-containing organic compound is isoquinoline or a derivative thereof.

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Pune, India

Rengaswamy Jaganathan