Kinetic Analysis of Aluminum Isopropoxide Hydrolysis-Condensation
1. Liaoning Key Laboratory for Fabrication and Application of Superfine Inorganic Powders, Dalian Jiaotong University,
Dalian 116028, China;
2. Department of Materials Science and Engineering, Yingkou Institute of Technology, Yingkou 115014, China;
3. Shanghai Institute of Ceramics, Chinese Academy of Sciences, Shanghai 200050, China
Abstract Aluminum isopropoxide hydrolysis-condensation kinetics was studied by method of combining the experiment of water content on-line determination with computer simulation. The rate constants and activation energy of hydrolysis, dehydration and dealcoholization of aluminum isopropanol were obtained respectively by nonlinear fitting method of the curve of water content via time which based on different Al(OR)3/H2O mole ratio and different temperatures. Based on the experimental results and the established kinetic model, the relationship between the concentration of functional groups and the reaction termination time under different reaction temperatures and initial reactants concentration ratios was obtained by Runge-Kutta method. Thus, the equation of reaction time, reaction temperature, and concentration of aluminum isopropanol and molar ratio of aluminum isopropanol to water were obtained. The results provided a valuable reference for preparation of high purity alumina.
