摘要
高纯次磷酸铝可以利用次磷酸钠和硫酸铝的复分解反应来合成,为了获得该过程的优化操作条件,对相关体系的热力学和反应动力学进行了研究,结果如下：a.确定了50℃次磷酸铝的成盐相区边界,获得了50℃最大收率的最佳配料及最小加水量;b.根据次磷酸铝的成盐相区特征判定影响次磷酸铝产品质量的杂质主要是硫酸钠或硫酸钠铝复盐;c.多温反应平衡表明,温度在40℃以上,温度对产品收率略有影响,在70~80℃可获得最大收率;d.多温反应动力学研究获得了50~100℃范围反应速率方程,其中反应级数为0.8,指前因子为2.024×104 1/s,反应活化能为3.850×10~4 kJ/kmol;e.反应温度对反应速率影响很大,70、80、90及100℃的反应完成时间分别为183、127、84和64min,综合考虑反应收率和时间,反应温度控制在90℃以上。
High-purity Al（H2 PO2 ）3 can be synthesized by re- placement reaction between sodium hypophosphite and aluminium sulfate. To optimize the process design and control of synthesis of Al（H2 PO2 ）3, this study focuses on the related thermodynamics reactive dynamics with its results as follows： a. Al（H2 PO2 ）3 salt-forming region at 50 ℃ was determined and the best ratio of raw materials and minimum water amount was obtained, b. The fea- tures of Al（H2 PO2 ）3 salt-forming region showed that the main impurity of Al（H2 PO2 ）3 product would he sodium sulfate or com- plex salt of sodium-aluminium sulfate, c. The reaction equilibrium at multi-temperatures showed that the product yield was slightly influenced by temperature at great than 40℃ and the maximum yield of 98.7% was obtained at 70-80 ℃. d. The reaction rate e- quation suitable for 50×100 ℃ was determined with reaction order n of 0.8, pre-exponential factor k 0of 2. 024 × 104 1/s and reaction activation energy E of 3. 850 × 104 kJ/kmol, e. The reaction rate was significantly influenced by reaction temperature and the reac- tion completion time at 0 ℃, 80℃, 90 ℃and 100 ℃was 183, 127, 84 and 64 minutes respectively. Considering the product yield and the reaction time, the reaction temperature was controlled to be great than 90℃.
出处
《化工矿物与加工》
CAS
北大核心
2016年第1期10-14,共5页
Industrial Minerals & Processing
基金
国家自然科学基金(No.21176189,No.U1407204)
关键词
次磷酸铝
次磷酸钠
硫酸铝
反应合成
过程优化
aluminium hypophosphite
sodium hypophosphite
a-luminium sulfate
reactive synthesis
process optimization
