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    • 9. 发明授权
    • Method for recovering methanol solvent
    • 甲醇溶剂回收方法
    • US5395994A
    • 1995-03-07
    • US245949
    • 1994-05-19
    • Robert E. WilliamsWilliam J. Cranston, III
    • Robert E. WilliamsWilliam J. Cranston, III
    • C07C29/80C07C37/62C07C39/367C07C27/26C07C29/74C07C37/68
    • C07C29/80C07C37/62
    • This invention provides an environmentally acceptable method for recovery of phenolic and brominated phenolic compounds, alcohol solvent, and bromide values from the a reaction medium liquid mixture formed in the production of a tetrabromobisphenol-A predominant product. The process comprises (a) separating the tetrabromobisphenol-A predominant product and alkyl bromide from the reaction medium thereby forming a liquid mixture containing alcohol, phenolic and brominated phenolic compounds, HBr, and water; (b) treating the liquid mixture with a sufficient amount of alkaline or alkaline earth metal hydroxide so as to form a treated aqueous mixture having a pH in the range of from about 9.5 to about 14.0, and containing MBr.sub.n, water, alcohol, and soluble salts of the phenolic and brominated phenolic compounds, wherein M is an alkaline or alkaline earth metal ion, and n is the valence of M; (c) distilling alcohol from the treated aqueous mixture of (b); (d) acidifying the treated aqueous mixture from (c) subsequent to distillation with a sufficient amount of acid to precipitate the phenolic and brominated phenolic compounds therefrom; and (e) separating the precipitated phenolic and brominated phenolic compounds from the acidified aqueous mixture of (d).
    • 本发明提供了一种用于从生产四溴双酚A主要产物中形成的反应介质液体混合物回收酚类和溴化酚类化合物,醇溶剂和溴化物值的环境可接受的方法。 该方法包括(a)从反应介质中分离出四溴双酚A主要产物和烷基溴,从而形成含有醇,酚和溴化酚化合物HBr和水的液体混合物; (b)用足量的碱金属或碱土金属氢氧化物处理液体混合物,以形成pH在约9.5至约14.0范围内的处理过的水性混合物,并含有MBrn,水,醇和可溶的 酚类和溴化酚类化合物的盐,其中M是碱金属或碱土金属离子,n是M的化合价; (c)从经处理的(b)水混合物中蒸馏出醇; (d)用(c)在蒸馏后用足够量的酸酸化经处理的含水混合物以从其中沉淀酚类和溴化酚类化合物; 和(e)从(d)的酸化含水混合物中分离出沉淀的酚类和溴化酚类化合物。
    • 10. 发明授权
    • Process for high purity tetrabromobisphenol-A
    • 高纯度四溴双酚A的工艺
    • US5283375A
    • 1994-02-01
    • US990414
    • 1992-12-15
    • Bonnie G. McKinnieGary L. SharpRobert E. Williams
    • Bonnie G. McKinnieGary L. SharpRobert E. Williams
    • C07C37/62C07C37/68C07C37/70C07C37/82C07C39/367C07C39/38
    • C07C37/70C07C37/62C07C37/685C07C37/86C07C39/367
    • This invention relates to a process for preparing a flame retardant product predominant in tetrabromobisphenol-A. The process comprises: (a) dissolving bisphenol-A in a methanol solvent containing up to about 5 weight percent water, wherein the ratio of methanol to bisphenol-A ranges from about 25 to about 43 moles of methanol per mole of bisphenol-A based on the total amount of methanol used and the total amount of bisphenol-A to be brominated; (b) adding to the solution in (a) from about 3.9 to about 4.2 moles of bromine per mole of bisphenol-A to be brominated while maintaining a reaction temperature in the range of from about 0.degree. to about 40.degree. C.; (c) after the bromination is substantially complete, adding water to precipitate the tetrabromobisphenol-A thus formed; and (d) purifying the precipitated tetrabromobisphenol-A so as to obtain a product predominant in tetrabromobisphenol-A containing less than about 20 ppm total ionic impurity.
    • 本发明涉及一种主要用于四溴双酚A的阻燃剂的制备方法。 该方法包括:(a)将双酚-A溶解在含有至多约5重量%水的甲醇溶剂中,其中甲醇与双酚A的比例为约25至约43摩尔甲醇/摩尔双酚A基 关于所用甲醇的总量和要被溴化的双酚A的总量; (b)在(a)中加入约3.9至约4.2摩尔溴/摩尔待溴化双酚A,同时保持反应温度在约0℃至约40℃的范围内; (c)在溴化基本完成后,加入水以沉淀由此形成的四溴双酚A; 和(d)纯化沉淀的四溴双酚A以获得在四溴双酚A中占优势的产物,其含有小于约20ppm的总离子杂质。