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    • 9. 发明授权
    • Process for preparing bisphenol-A
    • 制备双酚A的方法
    • US5146007A
    • 1992-09-08
    • US715954
    • 1991-06-17
    • Michael J. Cipullo
    • Michael J. Cipullo
    • C07C37/20
    • C07C37/20
    • In the preparation of bisphenol-A by condensation of phenol with acetone in the presence of an acidic ion-exchange resin catalyst, pretreatment of the catalyst to render it anhydrous comprises two steps to minimize resin degradation. In the first step, from 25 to 90 percent by weight of the resin associated water is removed by vaporization, and in the second step dehydration is completed by saturating the partially dehydrated catalyst with phenol. The advantage of the improvement in the process resides in a more efficient drying, requiring less time and minimal degradation of the resin structure.
    • 在酸性离子交换树脂催化剂存在下,通过苯酚与丙酮的缩合制备双酚A,催化剂无水预处理包括使树脂降解最小化的两个步骤。 在第一步中,通过蒸发除去25〜90重量%的树脂相关水,在第二步中,通过用苯酚使部分脱水的催化剂饱和来完成脱水。 该方法的改进的优点在于更有效的干燥,需要更少的时间和最小的树脂结构的降解。