摘要
用恒界面池法研究了硫酸盐介质中P204钠皂萃取Mn(II)的动力学.考察了搅拌速度、温度、界面面积、P204钠皂浓度、水相Mn(II)浓度对其萃取速率的影响.Mn(II)萃取速率随搅拌速度增大而增大,当搅拌速度大于104r/min后,萃取速率不再受搅拌速度影响;Mn(II)萃取速率随温度升高和界面面积增大而增大.P204钠皂萃取Mn(II)的表观活化能为23.50kJ/mol.P204钠皂萃取Mn(II)为界面化学反应控制过程.Mn(II)萃取速率随P204钠皂浓度和水相Mn(II)浓度增大而增大,且前者对萃取速率的影响大于后者.在界面面积为21.19cm2、温度为18℃条件下,P204钠皂萃取Mn(II)的界面反应动力学速率方程为r=2.06×10-2[NaA](O)1.35[Mn2+]0.41.
The extraction kinetics of Mn（II） from sulfate medium by the sodium salt of P204 （Na-P204） was studied using a modified Lewis cell.The effects of stirring speed,temperature,interfacial area,and concentrations of Na-P204 and of Mn（II） on the extraction rate of Mn（II） were investigated.The extraction rate increased with increasing of stirring speed,temperature and interfacial area.The extraction rate remained constant with further increase of stirring speed when it was above 104 r/min.The apparent activation energy of Mn（II） extraction by Na-P204 was 23.50 kJ/mol.The rate determining step of Mn（II） extraction by Na-P204 was chemical reaction at the interface.The extraction rate was proportional to the concentrations of Mn（II） in the aqueous phase and Na-P204 in the organic phase.The effect of concentration of Mn（II） on the extraction rate is less pronounced than that of Na-P204.The extraction rate could be represented by the following equation under the conditions of 18℃ and interfacial area 21.19 cm2：r 2.06 10-2[NaA]（O）1.35[Mn2＋]0.41.
出处
《过程工程学报》
CAS
CSCD
北大核心
2011年第1期61-64,共4页
The Chinese Journal of Process Engineering
基金
国家重点基础研究发展规划(973)基金资助项目(编号:2007CB613505)
国家自然科学基金资助项目(编号:50674014)
