Study on Stability of Ion-exchange Resin Catalysts:Ⅱ. Desulfonation during Isobutylene Dimerization

The performance of ion-exchange resin catalysts during isobutene (IB) dimerization was investigated under different IB contents,temperatures and liquid-volume hourly space velocity (LHSV) using a plug flow reactor in the absence of any selectivity enhancing component.High IB content and temperature resulted in a high conversion and C12 selectivity bu low C8 selectivity.The influence of LHSV was related with the IB content:LHSV had great effect at high IB content,while the performance of ion-exchange resin changed little with LHSV if IB content was low.The effect of water on the stability of resins was also studied.Desulfonation was observed during the C4 dimerization reaction when water was added to the feed.Chlorinated resin was more stable than conventional polystyrene-based resins during the test.

Study on the Stability of Ion-exchange Resin Catalysts:Ⅰ. TGA as a Rapid Evaluating Method

五商业离子交换树脂催化剂的热稳定性与不同的起始的水内容在 150 和 200 件树脂样品的范围在多达 600 的提高的温度和等温的温度借助于热 gravimetric 分析(TGA ) 被学习也被调查。学习显示了那 TGA，作为为塞子流动反应堆系统途径的一个补足的评估方法，能在离子交换树脂催化剂的热稳定性上为学习被用作一个快分析工具。等温地对待的树脂催化剂的 stoichiometric 计算基于 FTIR 分析和酸能力证实在 150 和 200 点的树脂的重量损失被 desulfonation 过程引起并且 desulfonation 主要在苯戒指的帕拉位置发生在树脂。H+ 离子和潮湿在 desulfonation 过程起了一个重要作用。