铬酸钡与硫酸氢钠制备重铬酸钠的宏观反应动力学  

Reaction Macrokinetics for Preparation of Sodium Dichromate from Barium Chromate and Sodium Hydrogen Sulfate

作　　者：田颖[1,2] 王学魁[2] 高毅颖[1] 徐红彬[1] 沙作良[2] 

机构地区：[1]中国科学院过程工程研究所,北京100190 [2]天津科技大学海洋科学与工程学院,天津300457

出　　处：《过程工程学报》2012年第1期59-63,共5页The Chinese Journal of Process Engineering

基　　金：国家自然科学基金资助项目(编号:50904058)

摘　　要：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 macrokinetics on preparation of Na2Cr2O7 from BaCrO4 and NaHSO4 was studied. The effects of stirring rate, H＋ concentration and reaction temperature on BaCrO4 conversion rate were investigated. The results showed that the preparation of Na2Cr207 included that BaCrO4 was dissolved in an acidic aqueous solution to reactive formation of BaCr2O7, BaSO4 and Na2Cr207 formed from the reaction of BaCr2O7 with NaHSO4, and BaSO4 was crystallized to precipitation. The reaction temperature must be raised as high as possible, the stirring rate was kept at 400 r/min, the H＋ concentration must be more than 0.01 mol/L and less than the H＋ concentration when sodium hydrogen sulfate was in saturation. The parameters in the model were estimated, the activation energy was 41.029 kJ/mol, and the frequency factor 15978.51. The one-order kinetic model was obtained by analysis of experimental data, which was -In（ 1-XA）= 15978.51 exp[-41.029× 10^3/（RT）]t.

关 键 词：重铬酸钠 一级反应 反应速率常数 宏观动力学 动力学模型 

分 类 号：TQ136.1[化学工程—无机化工]