TiCl_4高温气相氧化过程的动力学研究

Oxidation Kinetics of Titanium Tetrachloride in Vapor Phase

采用积分线性回归法和多元线性回归法研究了TiCl4氧化过程的动力学,建立了氧化过程的动力学方程。两种方法得到的表观活化能分别为97.39和80.01 kJ.mol-1,频率因子分别为1.0487×104s-1和2.09×102mg.Pa-2.min-1。实验考察了反应温度和TiCl4流量对反应速率的影响,结果表明在1000℃以上时,反应速率随温度升高迅速增加,反应速率与TiCl4流量基本呈线性关系。通过对氧化过程的机制分析表明,在反应初期及中期,反应速率常数取决于TiCl4浓度;在反应末期,反应速率常数取决于氧气浓度。

The oxidation kinetics of titanium tetrachloride to produce titanium dioxide was studied to provide an understanding of the TIC14 oxidation reaction. The kinetics equations were obtained through integral linear regression method and multivariate linear regression method. The apparent activation energy and pre- exponential factor were 97.39 kJ· mol^-1 and 1. 0487 × 10a^4 s^- 1 determined by the former method, while 80.01 kJ·mol^-1 and 2.09 ×10^2 mg·Pa^-2.min^-1 by the latter. The influences of reactor temperature and the flowrate of TiCl4 on the reaction rate were investigated by experiments. The results showed that reaction rate ac- celerated with the increase of temperature and the re- action rate was related linearly with the flow rate of TiCL above 1000 ~C. By analysis of mechanism of oxidation process, the reaction rate constant depended on the concentration of TiCl4 in the initial and middle stages of reaction, as well as on the concentration of oxygen in the last stage.