高等学校化学学报 ›› 1988, Vol. 9 ›› Issue (6): 601.

• 论文 • 上一篇    下一篇

在阴离子交换树脂催化剂上合成二丙酮醇的动力学研究

方延铨, 张书笈, 邢晓东, 石会占, 赵维君   

  1. 南开大学化学系
  • 收稿日期:1986-11-11 出版日期:1988-06-24 发布日期:1988-06-24
  • 通讯作者: 方延铨
  • 基金资助:

    中国石化总公司发展部资助课题

The Kinetics Study on Synthesis of Diacetone Alcohol on Basic Ion Exchange Resin Catalyst

Fang Yanquan, Zhang Shuji, Xing Xiaodong, Shi Huizban, Zhao Weijun   

  1. Chemistry Department, Nankai University, Tianjin
  • Received:1986-11-11 Online:1988-06-24 Published:1988-06-24

摘要: 动力学研究表明,在碱性树脂催化剂上丙酮缩合制二丙酮醇是一个1-1级可逆反应,本文对此多相催化的反应机理进行了探讨。

关键词: 动力学, 碱性离子交换树脂, 缩合, 二丙酮醇

Abstract: This paper studies on a basic ion exchange resin catalyst that was used in condensation reaction of acetone to prepare diacetone alcohol and find it having good activity and selectivity. The life time of this catalyst is long,and the method of regeneration of deactivated catalyst is easy. The kinetics experiments on preparation of diacetone alcohol from acetone on this resin catalyst show that the condensation reaction is obviously reversible. The forward and reverse reaction are first-order reaction for concentration of acetone and diacetone res-peptively. This reaction is fond to obey the following rate equation.-dCacetone/dt=k+Cacetone-k_Cdiacetone The apparent activation energy of forward and reverse reaction can be obtained from each rate constant k+ arid k_ and according to this activation energy theheat of the condensation reaction can be given also. It is - 24kJ/mol. On the basis of the kinetics experiments we suggest that acetone was adsorpted onto theactive site of the resin catalyst first and secondly the adsorpted molecular of acetone decompose to form acetonyl. Then the acetonyl reacts with another molecule of acetone forming diacetone and regenerating catalyst again.The second step is the rate-control step. We also estimate the heat of the reaction by calculating the bond energies of the compounds which were involved in. the condensation reaction. The values of the heat of reaction between the calculating . result and kinetics experiment are very close.

Key words: Kinetics, Basic ion exchange resin, Condensation, Diacetone alcohol

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