Council of Scientific and Industrial Research

Sopan T Chaudhari

Vasant Ramchandra Choudhary

Raghunath Vitthal Chaudhari

Chandrashekhar Vasant Rode

Subhash Dwarkanath Sansare

Rengaswamy Jaganathan

Meenakshi Y Pandit

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

This invention discloses an improved integrated two step process for conversion of methane to liquid hydrocarbons of gasoline range. The invention particularly comprises catalytic oxidative conversion of methane with free oxygen to ethylene and higher olefins containing gaseous product in the first step and catalytic conversion of the olefins from the product stream of the first step without separating them to liquid hydrocarbons of gasoline range in the second step, for the conversion of methane to liquid hydrocarbons. The process of the present invention could be used in the petroleum industry for the production of gasoline and liquid hydrocarbon fuels and aromatic hydrocarbons.

Integrated two step process for conversion of methane to liquid

A process for preparation of an improved Li-promoted MgO catalyst useful for oxidative coupling of methane to ethane and ethylene, in presence of free oxygen, which comprises (i) mixing thoroughly powdered magnesium acetate and lithium acetate, which are catalyst precursors, with Li/Mg mole ratio of 0.01-1.0 with or without water, the H.sub.2 O/magnesium acetate weight ratio being in the range of 0-5.0, (ii) heating the mixture, while stirring, to dryness at a temperature of about 60.degree.-300.degree.C., (iii) powdering and calcining the dried mixture at a temperature of about 500.degree.-1000.degree.C. in presence of air, O.sub.2, CO.sub.2, inert gas (like N.sub.2, He, Ar, etc.) or their mixture or under vacuum for about 1-100 h and (iv) making by known methods the pellets, extrudates or granules of the catalyst of required size.

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Maharashtra, India

Sopan T Chaudhari