对氯甲苯催化氯化反应动力学研究  被引量:2

Reaction Kinetics of the Catalytic Chlorination of p-Chlorotoluene

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作  者:何广科[1] 高华[2] 陈钟秀[1] 

机构地区:[1]浙江大学化学工程与生物工程学系,浙江杭州310027 [2]浙江交通职业技术学院,浙江杭州311112

出  处:《高校化学工程学报》2006年第6期1017-1021,共5页Journal of Chemical Engineering of Chinese Universities

摘  要:在温度为298.15-348.15K,采用SbCl3(质量分数为1.5%)为催化剂,将对氯甲苯(p-CT)催化氯化合成2,4-DCT和3,4-DCT。实验结果得出p-CT催化氯化的反应动力学方程式为:-d[p-CT]/dt=k[p-CT],k=8.969×10exp(-1575.451/T);并得出2,4-DCT和3,4-DCT的反应动力学方程,可分别表示为:d[2,4-DCT]/dt=[p-CT]0×[ka/(ka-kc)]×[ka exp(-kat)-kc exp(-kct)],d[3,4-DCT]/dt=[p-CT]0×[kb/(kb-kd)]×[kb exp(-kbt)-kd exp(-kdt)],其中:ka=9.558×10 exp(-1687.561/T),kb=9.757×exp(-1298.839/T,k=1.687×10^2 exp(-2378.880/T),kd=8.189×10^2 exp(-2184.041/T),结果表明p-CT催化氯化反应过程为一级平行反应。还考察了催化剂浓度对p-CT催化氯化合成DCT过程的反应速率常数的影响。Using SbCl3 (mass fraction: 1.5%) as catalyst, the catalytic chlorination ofp-chlorotoluene (p-CT) was conducted under the temperature range of 298.15-348.15K. According to the experimental data the kinetic equation of catalytic chlorination reaction for p-CT was obtained as follows: -d[ p-CT]/dt=k[p-CT]; k = 8.969-10exp(-1575.451/T). The kinetic equations of process producing 2,4-dichlorotoluene (2,4-DCT) and 3,4-dichlorotoluene (3,4-DCT) separately by chlorination were achieved too. The results show that the catalytic chlorination reaction of p-CT is a first-order parallel reaction. The effects of concentration of catalyst on reaction velocity were studied too for the processes of 2,4-DCT and 3,4-DCT preparations from p-CT via catalytic chlorination.

关 键 词:对氯甲苯 2 4-二氯甲苯 3 4-二氯甲苯 催化氯化 反应动力学 

分 类 号:TQ242.2[化学工程—有机化工] TQ203.9

 

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