文献类型：期刊文献

中文题名：混合丁烯/异丁烷硫酸烷基化反应动力学

英文题名：Alkylation kinetics of mixed butenes/isobutane by sulfuric acid

作者：李迪[1];孙伟振[1];奚桢浩[1];张明华[1];赵玲[1]

机构：[1]华东理工大学化学工程联合国家重点实验室,上海200237

年份：2015

卷号：66

期号：2

起止页码：584

中文期刊名：化工学报

外文期刊名：CIESC Journal

收录：CSTPCD;;EI(收录号：20151100647005);Scopus;北大核心:【北大核心2014】；CSCD:【CSCD2015_2016】；

基金：国家自然科学基金联合基金项目(U1162202);高等学校学科创新引智计划项目(B08021);中国博士后科学基金面上项目(2012M512055);宁夏自然科学基金项目(NZ13259)~~

语种：中文

中文关键词：烷基化;混合丁烯;反应动力学;碳正离子;动力学模型;参数估值

外文关键词：alkylation; mixed butenes; reaction kinetics; carbocation; kinetics modeling; parameter estimation

摘要：以硫酸为催化剂,间歇实验研究了276.2-285.2 K温度范围内混合丁烯/异丁烷烷基化反应动力学。实验结果表明,随着反应温度的降低,主产物三甲基戊烷（TMPs）生成量和烷基化油整体辛烷值增大,副产物二甲基己烷（DMHs）变化较小,高碳组分（HEs）的生成量降低明显。采用基于碳正离子反应机理建立的烷基化动力学模型对TMPs、DMHs、HEs 3类组分进行了计算分析,模拟计算结果表明,动力学模型对实验数据的拟合效果良好。链引发步骤异丁烯加氢离子反应表现出反Arrhenius行为,其本身及逆反应的活化能分别为45.14 k J·mol^-1和41.44 k J·mol^-1,增加对链传递部分C8正碳离子形成步骤的速率常数计算,部分涉及链传递和链终止反应步骤反应速率常数与文献值保持一致。
The alkylation kinetics of isobutane with mixed butenes using sulfuric acid as catalyst was investigated by batch experiments at temperatures from 276.2 K to 285.2 K under the conditions of industrial interest. With the decrease of reaction temperature, both the production of main product trimethylpentanes（TMPs） and RON of alkylates increased, and byproducts dimethylhexanes（DMHs） changed a little, but heavy ends components（HEs） reduced significantly. By using the alkylation kinetics model based on the classic carbonium ion mechanism, the concentration profiles with time regarding three groups of key alkylates, including TMPs, DMHs, and HEs, were compared against experiments. The regression results showed that the kinetics model fitted experimental data very well. An anti-Arrhenius behavior was found in the chain initiation step of the addition reaction of H＋ to isobutene, and the apparent activation energies of itself and the reverse reaction were 45.14 k J·mol^-1 and 41.44 k J·mol^-1. The calculation of reaction rates of the TMPs^＋ and DMHs^＋ forming steps was added, and most of the reaction rates of chain transfer and chain termination reactions remained the same as those in literature.