| 摘要 |
<p>A process for the preparation of 4,4'-isopropylidene bis(2,6-dibromophenol), also known as tetrabrombisphenol A, that dramatically reduces the formation of alkyl bromide by-products. Bisphenol A is brominated with a C3 to C5 n-alcohol in a water mixture to suppress the formation of alkyl bromides. The bisphenol A is brominated between 15 °C and 25 °C and then heated at 55 °C to 70 °C to insure bromination is complete. The tetrabrombisphenol A is then filtered from the reaction mixture and dried. Tetrabromobisphenol A produced from this process typically has a melting point of 180 °C or higher, and is typically greater than 98 % pure. Hydrogen peroxide is optionally combined with the reactants to reduce the amount of added bromine necessary for the bromination of the tetrabromobisphenol A.</p> |
