二氧化氮氧化二甲基硫醚宏观反应动力学

Macrokinetics of Dimethyl Sulfide Oxidation with Nitrogen Dioxide

用NO_2氧化二甲基硫醚(DMS)是合成二甲基亚砜(DMSO)的主要方法,反应过程受气液相传质影响很大．采用反应体积为120 mL的连续搅拌釜式反应器,对该反应的宏观动力学进行了研究．在温度为30～60℃、NO_2 和DMS进料流量分别为0．01～0．10 mol／min和0．005～0．05 moL／min的范围内,考查了反应速率的变化,并测定了不同温度下NO_2在DMSO中的饱和浓度．在热力学和动力学分析的基础上,推导出反应宏观动力学模型,由实验数据拟合出模型中的各参数．结果表明,该反应的活化能为21．64 kJ／mol,液相组成变化时反应速率存在极大值,且模型计算值与实验值相吻合．

Dimethyl sulfide （DMS） oxidation with NO2, which is a primary technique for the production of dimethyl sulfoxide （DMSO）, is influenced intensively by mass transfer of gas-liquid phase. The reaction rates of this reaction were investigated in a 120 mL continuous stirred tank reactor at reaction temperature of 30-60 ℃ ,with NO2 and DMS feeding flow rates of 0.01-0.10 mol/min and 0. 005-0.05 mol/min respectively.The concentrations of saturated NO2 in DMSO at various temperatures were also measured. Based on thermodynamic and kinetic analyses, a macrokinetic model was established and its parameters were obtained from experimental data by using fitting method. Results show that the activation energy of the reaction is 21.64 kJ/mol, the reaction rates calculated from the model agree with the experimental values and have a maximum value when the liquid compositions are changed.