Council of Scientific and Industrial Research

Pratap Tukaram Patil

Mohan Keraba Dongare

Kusum Madhukar Malshe

A process for the preparation of crystalline microporous titanium silicates using ethylsilicate-40 and titanium peroxide as silicon and titanium sources respectively is described. The process permits a significant decrease in the production cost of titanium silicate containing higher amount of titanium (Si/Ti=20) because of cheaper raw materials as well as reduction in the quantity of tetarpropylammonium hydroxide (TPAOH) template (SiO:TPAOH=1:0.06&#x2013;0.1) required for preparation. The material obtained by the present invention is useful as an active catalyst in the reactions such as oxidation of hydrocarbons, alcohols, sulphides, and thioethers.

Process for preparing microporous crystalline titanium silicate

The present invention relates to the process for vapor phase nitration of o-xylene using dilute nitric acid over H-beta zeolite. More particularly it relates to the selective formation of 4-nitro o-xylene by vapor phase nitration of 0-xylene using dilute nitric acid over commercially available H-beta catalyst. The continuous process of nitration of o-xylene comprises of a reaction carried out in a downflow reactor using o-xylene and dilute nitric acid with mole ratio of 2:1 to 1:2 and WHSV of 0.1-0.5 at 100-250&deg; C. at atmospheric pressure.

Process for the preparation of 4-nitro-o-xylene

Nitration of benzene is an important reaction for the production of nitro benzene, which is an important intermediate in chemical and pharmaceutical industries. Conventionally nitrobenzene is produced by liquid phase reactions employing mixed acids. A sulfuric acid/nitric acid mixture is the most commonly used nitrating agent. Generation of large amount dilute sulfuric acid, organic wastes and products of their neutralization makes the benzene nitration a environmentally harmful process. The present process enables the preparation of nitrobenzene by vapor phase nitration of benzene over solid acid catalyst, MoO /SiO using nitric acid. This process is a clean and environment friendly process without use of sulphuric acid.

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Pratap Tukaram Patil