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首页> 外文期刊>Journal of Applied Polymer Science >Evaluation of strongly acidic ion-exchange catalysts and the desulfonation study in the isobutylene dimerization reaction
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Evaluation of strongly acidic ion-exchange catalysts and the desulfonation study in the isobutylene dimerization reaction

机译：异丁烯二聚反应中强酸性离子交换催化剂的评价及脱硫研究

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摘要

Three commercial ion-exchange resin based catalysts were compared under different temperature and liquid-volume hourly space velocity (LHSV) in the isobutene (IB, C4) dimerization reaction using a plug flow reactor in the absence of any selectivity enhancing component. High IB conversion for all catalysts was obtained at or higher than 50°C. But, diisobutene (DIB, C8) selectivity decreased with the increase of temperature. High C8 selectivity was observed with LHSV higher than 1.5 at 50°C. The best catalytic performance of the three resins did not show obvious differences. The effect of the selectivity enhancers on the stability of the resins was also studied. Desulfonation was observed in the C4 dimerization reaction when water or the commonly used enhancer tert-butyl alcohol (TBA) was added to the feed. The deactivation of catalyst resulted in decrease of both IB conversion and C8 selectivity. Fourier Transform Infrared spectroscopy showed that desulfonation happened in both para and ortho positions of the sulfonated benzene rings.
机译：在不存在任何选择性增强组分的情况下，使用活塞流反应器在异丁烯（IB，C4）二聚反应中，在不同的温度和液体体积时空速（LHSV）下，比较了三种市售的基于离子交换树脂的催化剂。在50°C或更高的温度下，所有催化剂的IB转化率都很高。但是，二异丁烯（DIB，C8）的选择性随温度的升高而降低。在50°C下，LHSV高于1.5时，观察到高C8选择性。三种树脂的最佳催化性能未显示明显差异。还研究了选择性增强剂对树脂稳定性的影响。将水或常用的增强剂叔丁醇（TBA）添加到进料中时，在C4二聚反应中观察到脱硫。催化剂的失活导致IB转化率和C8选择性的降低。傅里叶变换红外光谱表明，磺化苯环的对位和邻位都发生了脱硫。

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