文献类型：期刊文献

英文题名：Kinetics of coupling cracking of butene and pentene on modified HZSM-5 catalyst

作者：Li, Jianwen[1];Li, Tao[1];Ma, Hongfang[1];Sun, Qiwen[2];Li, Chunzhong[3];Ying, Weiyong[1];Fang, Dingye[1]

机构：[1]East China Univ Sci & Technol, Engn Res Ctr Large Scale Reactor Engn & Technol, Minist Educ, State Key Lab Chem Engn, Shanghai 200237, Peoples R China;[2]State Key Lab Coal Liquefact & Coal Chem Technol, Shanghai 201203, Peoples R China;[3]East China Univ Sci & Technol, Key Lab Ultrafine Mat, Minist Educ, Sch Mat Sci & Engn, Shanghai 200237, Peoples R China

年份：2018

卷号：346

起止页码：397

外文期刊名：CHEMICAL ENGINEERING JOURNAL

收录：;EI(收录号：20181605031458);WOS:【SCI-EXPANDED(收录号:WOS:000432878400041)】；

基金：We are grateful to the financial support from the National Key Technology Program of China (No. 2006BAE02B02).

语种：英文

外文关键词：Butene; Pentene; HZSM-5; Catalytic cracking; Kinetic model

摘要：The cracking of butene and pentene is an effective route for MTO process to sufficiently utilize these olefin byproducts. Butene and pentene can be efficiently converted to propylene and ethylene over HZSM-5 catalyst modified by Fe and P. In the coupling cracking of butene and pentene, butene mainly cracked through bimolecular pathway, while pentene cracked via both monomolecular and bimolecular pathways. Moreover, propylene was an intermediate product and might involve other type reactions besides cracking. Based on the effect of operating conditions, a six-lump (butene, pentene, propylene, ethylene, C1-5 alkanes and C6+ hydrocarbons) kinetic model is proposed for the coupling cracking of butene and pentene. Different cracking mechanisms were taken into account, and different reaction orders were obtained for reaction steps in the kinetic model. The experimental data were measured in an isothermal fixed-bed reactor under a wide range of operating conditions (at 490-610 degrees C; space time of 0.93-4.67 (g of catalyst) h (mol CH2)(-1); steam ratio of 0.18-0.9 (g of steam) (g of feed)(-1) range), and the kinetic parameters were estimated through Levenberg-Marquardt algorithm. A good parity between calculated and experimental data was attained, indicating the applicability of the model to quantify the distribution of product lumps.