申请人:Great Lakes Chemical Corp.
公开号:US05475153A1
公开(公告)日:1995-12-12
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 C.sub.3 to C.sub.5 n-alcohol in a water mixture to suppress the formation of alkyl bromides. The bisphenol A is brominated between 15.degree. C. and 25.degree. C. and then heated at a 55.degree. C. to 70.degree. 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.degree. 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.
一种制备4,4'-异丙基亚甲基双(2,6-二溴苯酚)的方法,也称四溴双酚A,该方法显著减少了烷基溴副产物的形成。将双酚A与C.sub.3至C.sub.5的正链醇在水混合物中进行溴化,以抑制烷基溴的形成。将双酚A在15°C至25°C之间进行溴化,然后加热至55°C至70°C以确保溴化完成。然后从反应混合物中过滤出四溴双酚A并干燥。通过该方法生产的四溴双酚A通常具有180°C或更高的熔点,并且通常纯度大于98%。氢过氧化物可以与反应物结合,以减少溴化四溴双酚A所需的溴添加量。