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    • 3. 发明授权
    • Method for continuous production of dihydroxydiarylalkanes
    • 连续生产二羟基二芳基烷烃的方法
    • US06307111B1
    • 2001-10-23
    • US09423702
    • 1999-11-12
    • Gerhard FennhoffHans-Josef BuyschGerd Fengler
    • Gerhard FennhoffHans-Josef BuyschGerd Fengler
    • C07C3916
    • C07C37/84C07C37/20Y02P20/127C07C39/16
    • The present invention relates to a process for the continuous production of dihydroxydiarylalkanes (bisphenols) by the reaction of fresh phenol, phenol and isoalkenylphenol from the decomposition of by-products, and ketone. In this process the bulk of the bisphenol is recovered from the reaction mixture by crystallization and the mother liquor obtained is freed from phenol by distillation. The phenol is returned to the reaction and the bottoms obtained during the distillation are decomposed in a reactive rectification after addition of a basic catalyst. The phenol and isoalkenylphenol leaving at the top are led back into the reaction; the bottoms from the first reactive column are acidified and in a second reactive rectification, in the presence of an acid catalyst, are further decomposed into phenol, which distils off and is reused in the reaction, and bottoms, which are disposed of.
    • 本发明涉及通过副产物分解与酮的新鲜酚,苯酚和异烯基苯酚的反应连续制备二羟基二芳基烷烃(双酚)的方法。 在该方法中,通过结晶从反应混合物中回收大部分双酚,所得到的母液通过蒸馏除去苯酚。 苯酚回到反应中,并且在加入碱性催化剂之后,在蒸馏期间获得的塔底物在反应性精馏中分解。 离开顶部的苯酚和异烯基苯酚被引回到反应中; 在第一反应性柱的底部被酸化,并且在第二反应性精馏中,在酸催化剂的存在下,进一步分解成苯酚,其被蒸发并在反应中重新使用,并且被处理的塔底物。