发明名称 |
Process for high purity tetrabromobisphenol-A |
摘要 |
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 degrees to about 40 degrees 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.
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申请公布号 |
US5283375(A) |
申请公布日期 |
1994.02.01 |
申请号 |
US19920990414 |
申请日期 |
1992.12.15 |
申请人 |
ETHYL CORPORATION |
发明人 |
MCKINNIE, BONNIE G.;SHARP, GARY L.;WILLIAMS, ROBERT E. |
分类号 |
C07C37/62;C07C37/68;C07C37/70;C07C37/82;C07C39/367;(IPC1-7):C07C39/38 |
主分类号 |
C07C37/62 |
代理机构 |
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代理人 |
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主权项 |
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地址 |
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