1,2-二氯-4-硝基苯催化合成反应动力学

The Kinetics of Synthesis 1,2-Dichloro-4-Nitrobenzene in Tower Chlorinator

在塔式氯化器中,以路易氏酸作催化剂,氯气氯化对硝基氯苯,合成1,2-二氯-4-硝基苯。根据亲电取代机理和连串反应特征,提出了塔式氯化器中对硝基氯苯间歇氯化的宏观动力学模型,并通过实验确定了该模型参数。结果表明,对硝基氯苯氯化为一典型的连串反应,对反应物氯气浓度和对硝基氯苯浓度均表现为一级反应;在90～105℃,m(催化剂)/m(对硝基氯苯)为6%,氯气流量3.5～4.5 mL/s条件下,反应的表观活化能分别为69.8kJ/mol和93.3kJ/mol。

1, 2~dichloro-4-nitrobenzene (D) was prepared in a tower chlorinator for which 1-chloro-4-nitrobenzene(P) reacted with chlorine in presence of Lewis acid catalyst. According to the characteristics of consecutive reaction, the chlorinating kinetics model was set up. The experiments were operated under the reaction conditions of 90~105 ℃, m (catalyst)/m (P) 6%. It was experimentally showed that it was first order for P and chlorine. Under 90~105 ℃, m(catalyst)/m(P) 6%, chlorine flow 3. 5-4. 5 mL/s, the pre-exponential factors of apparent reaction rate coefficient of the consecutive reactions were 1. 25×107 and 2.12×109 respectively, and the apparent activation energy of the consecutive reactions were 69. 8 kJ/mol and 93. 3kJ/mol respectively.