Process for preparation of non-hazardous brominating agent
AssigneeCouncil of Scientific and Industrial Research
InventorsRamachandraiah Gadde, Pushpito Kumar Ghosh, Adimurthy Subbarayappa, Ashutosh Bedekar, Dipak Balvantrai Shukla
Life of this patent
Estimating the term…
Abstract
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.
Claims7
A process for preparing a brominating reagent by the oxidation of a source of bromide ions to bromate ions, comprising
- (i) dissolving an alkali in de-ionized water to form an alkali solution
- (ii) mixing a source of bromide ions with the alkali solution to form a reaction mixture
- (iii) purging the reaction mixture with chlorine gas or flue chlorine gas at a rate of 100 to 1000 ml per minute for 6 to 8 hours to provide a purged reaction mixture
- (iv) diluting the purged reaction mixture with 2 to 3 times v/v of the source of bromide ions to provide a diluted purged reaction mixture
- (v) evaporating water from the diluted purged reaction mixture to obtain a solid brominating reagent and drying the solid brominating reagent at a temperature in the range of 55 to 80° C.
Dependencies are inferred from the claim text.