微反应器内对甲砜基甲苯硝化反应动力学研究  

Kinetics of p-Methylsulfonyl Toluene Nitration in Microreactor System

作　　者：杨兰雪 邱滔[1] YANG Lanxue;QIU Tao(School of Petrochemical Engineering,Changzhou University,Changzhou 213164,China)

机构地区：[1]常州大学石油化工学院,江苏常州213164

出　　处：《化学反应工程与工艺》2023年第6期511-518,共8页Chemical Reaction Engineering and Technology

摘　　要：对甲砜基甲苯硝化反应由于反应迅速、高放热和非均相等特性,难以获得较为准确的动力学数据。以硝硫混酸为硝化试剂,在微反应器内对对甲砜基甲苯均相硝化反应动力学进行研究,构建包含微混合器、毛细管微反应器、毫秒级在线淬火模块的连续流微反应系统,测定了均相硝化反应动力学参数。在质量分数为88%的硫酸、温度为10~25℃、停留时间为1~5 s的条件下,确定该反应是二级反应,指前因子为7.16×10^(12)L/(mol·s),活化能为50.65 kJ/mol。同时在实验研究范围内对建立的动力学模型进行验证,结果表明,实测值与拟合计算值吻合良好,模型具有有效性,对工业设计和安全控制具有重要意义。It is difficult to get more accurate kinetic data for the nitration of p-methylsulfonyl toluene because of its fast,high exothermic,and heterogeneous characteristics.The kinetics of homogeneous nitration of p-methylsulfonyl toluene was studied in a microreactor using mixed acid as nitrifying reagent,and a continuous flow microreactor containing micro-mixer,capillary reactor,and millisecond on-line quenching module was built,and the kinetic parameters of homogeneous nitrification were determined.Under the conditions of 88%sulfuric acid,temperature 10-25℃,and residence time 1-5 s,the reaction was determined to be a second-order reaction,the pre-exponential factor was 7.16×10^(12)L/(mol·s),and the activation energy was 50.65 kJ/mol.At the same time,the dynamic model established within the scope of the experimental study was tested.The results showed that the measured values were in good agreement with the fitted calculated values,and the model was effective,which was of great significance for industrial design and safety control.

关 键 词：微反应器 均相反应 硝化反应 动力学 

分 类 号：TQ052.5[化学工程] O643[理学—物理化学]