【摘要】 研究了聚丙烯中空纤维膜萃取二(2乙基己基)膦酸(D2EHPA)水溶液中铜离子的工艺条件.结果表明,两相流速、膜面积对萃取率基本无影响;而水溶液的pH值和有机相初始铜离子浓度的改变使萃取率在40%—99%之间变化.整个萃取过程的传质阻力主要来源于D2EHPA和Cu2+的界面配位络合反应阻力,铜浓度比较高时,传质阻力与铜浓度无关;而当铜浓度降低时,传质阻力随着铜浓度的降低而增大.更多还原

【Abstract】 Processing conditions and mass transfer performance were studied for the system of Cu 2+/ D2EHPA kerosene using hydrophobic polypropylene hollow fiber membrane modules.Experiment results showed that the extraction efficiency were independent of flow rates of two phases and the areas of membrane extraction.However, pH of aqueous phase and the initial concentration of copper ions in organic phase have direct relation with extraction efficiency. The total mass transfer resistance was controlled by interfacial complexation reaction. The mass transfer resistance was independent of Cu 2+ at high copper ions concentration; but at low copper ions concentration, the mass transfer resistance increased as Cu 2+ concentration reduced.更多还原