发明名称 |
Process for the purification of crude 2,2-bis-(3,5-dimethyl-4-hydroxyphenyl)-propane |
摘要 |
Crude 2,2-bis-(3,5-dimethyl-4-hydroxyphenyl)propane (=tetramethyl-bisphenol A=TMBPA) can be purified by recrystallization, if C1-C4-monoalcohols with a water content of 2 to 40% by weight relative to the total weight of alcohol and water are used in an amount of 70 to 250% by weight, relative to the amount of TMBPA and the recrystallization is carried out at a temperature of 65 DEG to 150 DEG C.
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申请公布号 |
US4990686(A) |
申请公布日期 |
1991.02.05 |
申请号 |
US19890457419 |
申请日期 |
1989.12.27 |
申请人 |
BAYER AKTIENGESELLSCHAFT |
发明人 |
RAUCHSCHWALBE, GUENTER;BLANK, HEINZ-ULRICH;HANDSCHUH, VOLKMAR |
分类号 |
C07C37/84;C07C39/16 |
主分类号 |
C07C37/84 |
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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