Abstract：A catalytic cracking process for production of propylene and ethylene from C5 hydrocarbon with a catalyst of the ZSM-5 molecular sieve was investigated, especially the influence of reaction temperature and dilution ratio on product distribution was researched. The results showed that conversion of both C5 alkane and C5 olefins increased constantly with reaction temperature increasing, while the conversion of C5 olefins was much higher than that of C5 alkane. The yield of propylene and ethylene increased continuously from 8.84 % and 2.38 % at 450 ℃ to 19.67% and 13.86 % at 620 ℃ under reaction conditions of weight hourly space velocity of 3.06 h-1 and reaction partial pressure of 23.24 kPa. On the other hand, the conversion of C5 olefins, yield of ethylene, propylene and butene all decreased with dilution ratio increasing, while the yield of C6 hydrocarbon increased continuously. The mechanism of C5 hydrocarbon catalytic cracking was discussed. It was assumed that direct cracking of C5 olefins into ethylene and propylene and dimerisation of C5 olefins to C10 intermediate proceeded simultaneously. Then the cracking was carried out from the C10 intermediate. The above-mentioned mechanism can be used to explain experimental data satisfactorily.
Liu Juntao,Teng Jiawei. Reaction Performance and Mechanism for Production of Propylene and Ethylene from C5 Hydrocarbon by Catalytic Cracking[J]. 化学反应工程与工艺, 2015, 31(3): 213-219.
