C4烯烃组成变化对烷基化反应热力学行为的影响  

Impact of C olefins composition changes on thermodynamic behavior of alkylation

作　　者：凌洁[1] 曹潘 李阔 温立宪 仵嘉玲 孟凡 黎小辉 LING Jie;CAO Pan;LI Kuo;WEN Li-xian;WU Jia-ling;MENG Fan;LI Xiao-hui(College of Coal and Chemical Industry,Shaanxi Energy Institute,Xianyang 712000,China;College of Chemistry&Chemical Engineering,Xi'an Shiyou University,Xi'an 710065,China;Gas production technology research institute of the first gas production plant of Changqing Oilfield Company,Jingbian 718500,China)

机构地区：[1]陕西能源职业技术学院煤炭与化工产业学院,陕西咸阳712000 [2]西安石油大学化学化工学院,陕西西安710065 [3]长庆油田分公司第一采气厂采气工艺研究所,陕西靖边718500

出　　处：《现代化工》2020年第11期150-154,共5页Modern Chemical Industry

基　　金：陕西省教育厅自然科学专项(19JK0194);陕西省教育厅专项科研计划项目(18JK0605);国家级大学生创新创业训练计划资助项目(201910705042)。

摘　　要：针对丁烯资源中异丁烯体积分数增加、烷基化C4原料组成变化引起生产波动的现状,借助热力学方法对1-丁烯、2-丁烯、异丁烯与异丁烷在-10~50℃内液相烷基化反应特征进行分析。结果表明,烷基化反应为不可逆放热反应,放热量随温度升高略增大,生成目的产物放热量略大于生成副产物放热量,异丁烯烷基化反应放热量最小;不同丁烯烷基化反应平衡转化率均在99.9%以上,异丁烯烷基化平衡转化率略低于其他2种烯烃,主、副反应平衡转化率均随温度升高略降低;辛烷值较高的TMP的选择性随温度升高而降低,而副产物DMH、MH选择性增加。随着C4原料中异丁烯体积分数的增加,烷基化目的产物的选择性略降,且随着温度的升高降低趋势增强,温度对烷基化产物辛烷值影响敏感,有效控制并稳定反应温度可弥补烷基化产品质量的损失。In the light of the production fluctuation caused by the increasing isobutylene content in butene resources and the change of C4 raw material compositions for alkylation,the liquid phase alkylation characteristics of 1-butylene,2-butylene,isobutylene and isobutane in the range of-10℃-50℃are analyzed by means of thermodynamic method.Results show that alkylation reactions are all irreversible exothermic reactions,the heat release increases slightly with the higher temperature,heat release for target product is slightly greater than that for by-product,and the alkylation reaction of isobutylene release the least heat.The equilibrium conversion rates of different butylenes are all above 99.9%,and that of isobutylene are slightly lower than other two butylenes.The equilibrium conversion rates of main and side alkylation reactions all drop slightly when the temperature goes up.The selectivity of TMP with higher octane number decreases with the increasing temperature,while that of DMH and MH increases with higher temperature.With the increase of isobutylene content in C4 raw materials,the selectivity of alkylation target products decreases slightly,and the decreasing trend enhances with the increasing temperature.Temperature can generate sensitive influence on octane number of alkylation products,and the effective control and stability of reaction temperature can make up for the loss in quality of alkylation products.

关 键 词：烷基化 热力学 C4烯烃 异丁烯 产率 

分 类 号：TQ201[化学工程—有机化工]