Council of Scientific and Industrial Research

Dipak Balvantrai Shukla

Pushpito Kumar Ghosh

Raksh Vir Jasra

Ramachandraiah Gadde

Ashutosh Vasant Bedekar

Rajesh J Tayade

Anjani K Bhatt

Adimurthy Subbarayappa

The present invention provides a process for photocatalytically treating stains of chilly and turmeric caused on kitchen tiles and platforms by coating a thin film of photocatalyst made of a semiconductor such as titanium dioxide uniformly dispersed in dilute silica sol thereon and using a light source such as a fluorescent lamp to irradiate and photoexcite the photo catalytic thin film by the small amount of UV radiation included in the fluorescent light, resulting in photo decomposition and auto-cleaning of the stains.

Photocatalytic auto-cleaning process of stains

A cost-effective process is described for the preparation of a stable and non-hazardous brominating reagent containing 2:1 stoichiometric ratio of alkali bromide to alkali bromate. The process comprises of reacting alkaline bromine intermediate mixture, obtained from bromine recovery plant, with chlorine gas in the presence of a strong alkali to oxidize the bromide ions to bromate ions. This brominating reagent is useful for the bromination of aromatic compounds by substitutions.

Process for preparation of non-hazardous brominating agent

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Bhavnagar, India

Dipak Balvantrai Shukla