Council of Scientific and Industrial Research

Manisha Madhukar Telkar

Raghunath Vitthal Chaudhari

Chandrashekhar Vasant Rode

Vilas Hari Rane

Rengaswamy Jaganathan

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 an improved process for the preparation of 2-phenyl ethanol [CAS 60-12-8] by catalytic hydrogenation of styrene oxide [CAS 96-09-3] with supported platinum group metal catalysts in the presence of an organic as well as inorganic base as a promoter, using alcohol as a solvent. The reaction is carried out at a temperature ranging between 40-120.degree. C. and the hydrogen pressure of 50-800 psig, under stirring conditions. After the reaction is complete, the reaction mixture is cooled to room temperature, catalyst is separated from the product by conventional methods like filtration. This invention is particularly useful as an alternative to the conventional methods like Grignard synthesis and Friedel-Craft alkylation for manufacture of 2-phenyl ethanol. This invention eliminates the handling of dangerous diethyl ether solvent, ethylene oxide and the use of AlCl.sub.3 which poses serious effluent problems. The proposed invention produces 2-phenyl ethanol selectively with highest purity via the catalytic hydrogenation of styrene oxide.

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Manisha Madhukar Telkar