铝酸钠溶液分解反应研究  

The Studies of Decomposition Reaction of Sodium Aluminate Solution

作　　者：方敬东[1] 吴素芳[1] 王樟茂[1] 

机构地区：[1]浙江大学化学工程与生物工程学系,浙江杭州310027

出　　处：《高校化学工程学报》2002年第1期33-37,共5页Journal of Chemical Engineering of Chinese Universities

摘　　要：为了研究氧化铝生产过程中铝酸钠溶液的分解反应动力学方程及反应器的优化操作设计, 首先用络合滴定法测定了氧化铝在氢氧化钠溶液中在50~65℃范围内的溶解度, 它为研究动力学提供了基础数据, 并得出溶解度方程为:在温度精度控制在±0.1℃的间歇釜式玻璃反应器中,在温度为50~60℃、氧化钠浓度为110g(L(1和起始铝酸钠浓度为1.92mol(L(1的条件下,进行了65~84h的铝酸钠溶液的分解反应动力学实验.通过关联实验结果确定了反应动力学方程为:该方程计算值与实验值的相对误差≤5%.将溶解度方程与动力学方程进一步应用于反应器的优化操作设计,计算表明:采用动力学方程提供的铝酸钠最优操作过程,铝酸钠的分解率能提高4%左右.The decomposition reaction of sodium aluminate solution and reactor optimum design of the Al2O3 producing process were studied in detail. At first the Al2O3 solubility in the pure NaOH in the temperature range of 50~65℃ were measuremented to provide the foundamental data of the kinetics. The equation of the solubility was obtained as: Tc/4.221857.10ln-=*. In a batch glass reactor the kinetic experiments were carried out under the following conditions: reaction temperature 50~60℃, NaOH concentration 110g·L-1, starting sodium aluminate solution concentration 1.92mol·L-1, reaction time 65~84 hr. Based on the experimental results, the kinetic model was drawn as follows:)/)(()/10043.83exp(101664.1312**--=-cccARTrttA. Compared the kinetic results calculated by the kinetic model with the experiment results , the relative calculation error was less than 5%. The kinetic model was also applied in optimum design of the batch reactor. The calculation results showed that the decomposition ratio of the sodium aluminate solution could be increased 4% when using the operation condition designed by the presented kinetic model. This result is very important for the modification the equipment and technology of the industrial producing Al2O3.

关 键 词：铝酸钠溶液 氢氧化铝 分解反应 动力学 分解率 反应器 优化设计 

分 类 号：TQ133.1[化学工程—无机化工] TQ013.2