沸石催化剂上乙苯及二乙苯歧化反应研究

The Disproportionation of Ethylbenzene and Diethylbenzene over Zeolite Catalysts

研究在ＦＸ系列催化剂上，１８０～２８０℃范围内，乙苯和二乙苯各自可能发生的反应及其与乙苯合成反应的主要杂质二甲苯生成之间的关系．结果表明，乙苯在１８０℃以下基本不反应，温度增加，歧化反应转化率增加；２７０～２８０℃以上有少量副产物甲苯和二甲苯生成；二乙苯在２２０℃以下易发生歧化反应，而乙苯在２２０℃以上易发生歧化反应；二乙苯的反应过程中基本不生成二甲苯．

FX-01 and FX-02 zeolite catalysts can be used as catalysts for the synthesis ofethylbenzene in a fixed bed reactor operated at the temperature range between 180～280℃ The disproportionation of ethylbenzene and diethylben zene over them wasstudied at the same temperature range. The results show that ethylbenzene is nearly notdisproportionated below 180℃,and the disproportionation is increased with temperature.At 270 ~280℃ a little xylene and toluene are formed. As for diethylbenzene,in thesame range of temperature there is no xylene and toluene formed. Below 220℃ morediethylbenzene is disproportionated than ethylbenzene, while above 220℃ the other wayround.