摘要 |
<p>The present invention relates to a method to obtain polycarbonate-grade Bisphenol A. The Bisphenol A product is obtained by condensation of phenol with acetone in the presence of an acid ion-exchange resin catalyst in three steps in a single reactor and then Bisphenol A is separated from the resulting post-reaction mixture by way of a one-step or two-step suspension crystallization, adduct decomposition, and distilling off of phenol, and acetone is added to the obtained phenol and other phenolic fractions to obtain a concentration in the range 3-10% and contacted at a temperature in the range 50-870C with an acid ion exchange resin after part of its sulfonic groups have been neutralized with 2,2-dimethylthiazolidine or cysteamine, and is sent to the first or second step of suspension crystallization. In one of the embodiments of the invention, the resulting Bisphenol A is subjected to falling-film fractional crystallization.</p> |
申请人 |
INSTYTUT INZYNIERII MATERIALOW POLIMEROWYCH I BARWNIKOW;PRZEDSIEBIORSTWO WIELOFUNKCYJNE CHEMWIK SP. Z O.O.;KIEDIK, MACIEJ;SOKOLOWSKI, ADAM;KUBICA, STEFAN;BASTA, ADAM;MROZ, JERZY;HRECZUCH, WIESLAW;KALEDKOWSKA, MALGORZATA |
发明人 |
KIEDIK, MACIEJ;SOKOLOWSKI, ADAM;KUBICA, STEFAN;BASTA, ADAM;MROZ, JERZY;HRECZUCH, WIESLAW;KALEDKOWSKA, MALGORZATA |