Catalytic synthesis of linear alkylbenzene using supported heteropoly acid catalyst
ZHU Zuo-gang ZHANG Jin-chang LI Cheng-yue (The Key Laboratory of Science and Technology of Controllable Chemical Reactions, Ministry of Education, Beijing University of Chemical Technology, Beijing 100029, China)
The influences of molar ratios of benzene to dodecene on catalytically synthesizing linear alkylbenzene using supported heteropoly acid catalyst was investigated at a fixed bed reactor and certain reaction conditions. It is showed that the conversion ratio of dodecene and the selectivity of producing 2-alkylbenzene are slightly increased with increasing molar ratio of benzene to dodecene, respectively. The catalyst stability was also investigated at the following reaction conditions. The molar ratio of benzene to dodecene was 4∶1, total liquid space velocity 10?h -1 , and the reaction temperature 120?℃. The results show that the catalyst activity is obviously decreased after it is undergone continuously 70?h reaction at the fixed bed reactor. The deactivated catalyst was characterized by SEM, FT-IR and TG. The results show that the probably reason resulting in the catalyst losing its activity is the polymers, which was produced during the alkylation process, deposited on the catalytic sites.