ECO-friendly method of preparation of high purity tetrabromobisphenol-A

Abstract

This invention relates to an Eco-friendly method of preparation of high purity tetrabromobisphenol-A through the bromination of bisphenol-A (BPA) with a combination of bromide and bromate ions in organic solvent and water, reacting bromide salt of alkali or alkaline earth metal / hydrobromic acid and bromate as alkali / alkaline earth metal salt, optionally adding 12 N hydrochloric acid in case of metal bromide or equivalents in case of hydrobromic acid, adding alkyl sulfate salts having C6-C18 carbon chain as a surfactant at 5 to 45 DEG C over a period of 4 to 5 h under stirring, separating the crystalline (50-70 %) product; washing and drying of the product at 100 DEG C, and charging the organic layer containing un-reacted bisphenol-A, mono-, di- and tri-bromo derivatives and TBBPA with additional bisphenol-A and repeating the above process to yield 95-100 % of TBBPA in the subsequent batches.

Description

technical field

[0001] The invention relates to a preparation method of high-purity tetrabromobisphenol-A which does not harm the ecological environment. Background of the invention

[0002] Tetrabromobisphenol-A, (CH 3 ) 2 C(C 6 h 2 Br 2 Oh) 2 (TBBPA, 79-94-7) is an important substance among various brominated compounds. It is a brominated derivative of bisphenol-A (BPA). The high stability and adaptability as an additive and reactive compound make it useful as a flame retardant, which accounts for more than one-third of the total brominated flame retardants. TBBPA is also used in the preparation of acrylonitrile butadiene styrene (ABS) polymers and in the preparation of epoxy and polycarbonate resins. These resins are widely used in the manufacture of electronic equipment, especially computer printed circuit boards. Since TBBPA's high activity allows it to be used at relatively low loadings, the resin is also used as a flame retardant in the manufacture of coating...