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考察了BaCrO4与NaHSO4制备Na2Cr2O7过程中搅拌速率、氢离子初始浓度、反应温度对BaCrO4转化率的影响,在机理分析基础上进行了宏观动力学研究.结果表明,该过程为BaCrO4溶于酸性水溶液生成BaCr2O7、BaCr2O7与NaHSO4反应生成BaSO4与Na2Cr2O7、BaSO4结晶析出三步,反应过程中应尽量升高反应温度,搅拌速率可固定为400r/min,而氢离子浓度应大于0.01mol/L且小于NaHSO4饱和时的浓度.经过对实验数据处理和分析,建立了宏观动力学模型,得出该反应为一级反应,求得活化能为41.029kJ/mol,频率因子为15978.51,相应的宏观动力学方程为-ln(1-XA)=15978.51exp[-41.029×103/(RT)]t.
The effects of stirring rate, initial concentration of hydrogen ion and reaction temperature on the conversion of BaCrO4 were investigated in the process of preparing Na2Cr2O7 from BaCrO4 and NaHSO4, and the macroscopic kinetics was also studied on the basis of mechanism analysis. The results show that BaCrO4 is soluble in acidic aqueous solution BaCr2O7, BaCr2O7 reacted with NaHSO4 to produce BaSO4 and Na2Cr2O7, BaSO4 crystallized out three steps, the reaction temperature should be increased as far as possible, the stirring rate can be fixed to 400r / min, while the hydrogen ion concentration should be greater than 0.01mol / L and less than NaHSO4 saturation After the experimental data processing and analysis, macroscopic kinetic model was established, the reaction was first-order reaction, the activation energy was 41.029kJ / mol, the frequency factor was 15978.51, the corresponding macroscopic kinetic equation -ln (1-XA) = 15978.51exp [-41.029 × 103 / (RT)] t.