O,O-二甲基硫代磷酰氯氨解反应动力学

Ammonolysis of O,O-Dimethylphosphorochloridothioate and its Reaction Kinetics

根据卤素氨解反应机理,提出了O,O-二甲基硫代磷酰氯液相非催化氨解的反应历程,并建立了相应的拟均相反应动力学模型.在消除传质的影响下,由实验确定了模型参数.模型表明:在反应前期,O,O-二甲基硫代磷酰氯浓度对速率影响很小,反应速率呈拟一级反应特征;但在反应后期,反应速率呈明显的二级反应特征.氨与O,O-二甲基硫代磷酰氯的起始摩尔比以及氨浓度对反应速率影响显著.

A reaction pathway for ammonolysis of O, O-dimethylphosphorochloridothioate without catalyst was proposed, based on the reaction mechanism of acyl halide ammonolysis, and the pseudo-homogeneous reaction kinetics were founded. The model parameters were estimated from the measured data without the effect of mass transfer. The model showed that the effects of the initial mole ratio between ammonia and acyl chloride, concentration of ammonia and temperature on the reaction rate were very obvious. In addition, the effect of concentration of acyl chloride on the rate of ammonolysis was very small. The reaction rate demonstrated the pseudofirst order to ammonia during the earlier period of reaction and the second order to ammonia and acyl halide during the later period.