摘要
将钯炭(Pd/C)催化剂应用到苯酚加氢制环己酮反应中,选择苯作为溶剂,通过控制变量法考察了压力、温度、氢气与苯酚物质的量之比、苯酚的质量空速等反应条件对反应的影响;建立了本征动力学模型,利用25组正交试验数据进行参数估值,并对动力学模型进行了检验。结果表明,Pd/C催化剂用于苯酚加氢制备环己酮时,适宜的反应条件为:反应温度175~205℃,反应压力0.1 MPa,氢气与苯酚物质的量之比约为4,苯酚质量空速0.2~0.4 h^(−1)。经检验,本征动力学模型可靠性良好。
Cyclohexanone,a widely used organic chemical raw material,plays a very important role in industrial production.Hydrogenation of phenol to cyclohexanone has the advantages of mild reaction conditions,few by-products,and environmental friendliness.Pd/C catalyst was used for the hydrogenation of phenol to cyclohexanone.After comparing the dichloromethane,cyclohexane,ethanol,and benzene,benzene was selected as the solvent.At the reaction temperature 160—250℃,the reaction pressure 0.1—2.0 MPa,the weight hourly space velocity of phenol 0.2—1.0 h^(−1),the molar ratio of hydrogen to phenol 2—12,the influence of reaction conditions on the hydrogenation of phenol was investigated.A fixed bed tubular reactor charged with 80—100 mesh(150—180μm)Pd/C catalyst was developed.Eliminating the influence of internal and external diffusion,25 groups of experimental data were measured by changing the temperature,pressure and molar ratio of hydrogen to phenol.An intrinsic kinetic model was established based on the ideal adsorption model.The optimal reaction parameters were determined using 25 sets of orthogonal experimental data,and the dynamics model was also examined.The results show that the suitable reaction conditions are as follows:reaction temperature 175—205℃,reaction pressure 0.1 MPa,the molar ratio of hydrogen to phenol about 4,and the weight hourly space velocity of phenol 0.2—0.4 h^(−1).After statistical test and residual analysis,the established intrinsic kinetic model is applicable and has good reliability.
作者
王鹏
李涛
张海涛
房鼎业
WANG Peng;LI Tao;ZHANG Haitao;FANG Dingye(School of Chemical Engineering,East China University of Science and Technology,Shanghai 200237,China)
出处
《华东理工大学学报（自然科学版）》
CAS
CSCD
北大核心
2021年第3期255-261,共7页
Journal of East China University of Science and Technology
关键词
PD/C催化剂
苯酚加氢
环己酮
本征动力学
参数估值
Pd/C catalyst
phenol hydrogenation
cyclohexanone
intrinsic kinetics
parameter estimation
