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研究了聚丙烯中空纤维膜接触萃取器中二(2-乙基已基)膦酸萃取金属铜离子的工艺条件以及溶剂夹带,分析了原料的pH值、两相流速、有机相初始铜离子浓度以及萃取膜面积对萃取效率的影响,结果表明,两相流速、萃取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。这主要是由于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,当铜浓度比较高时,传质阻力或传质系数与铜浓度无关,其值基本不变;而当铜浓度降低时,传质阻力随着铜浓度的降低而增大,传质系数则随着铜浓度的降低而减小。
The technological conditions and solvent entrainment of copper (Ⅱ) with di (2-ethylhexyl) phosphonic acid in polypropylene hollow fiber membrane contact extractor were studied. The effects of pH value, two-phase flow rate, initial copper ion concentration The results showed that the two-phase flow rate and the extraction membrane area had almost no effect on the extraction rate, while the pH value of the aqueous solution and the change of the initial copper ion concentration in the organic phase led to the extraction rate of 40% -99% Change between. This is mainly due to the fact that the mass transfer resistance of the whole extraction process is mainly derived from the complexing reaction resistance at the interface of D2EHPA and Cu2 +. When the copper concentration is relatively high, the mass transfer resistance or mass transfer coefficient has nothing to do with the copper concentration, When the copper concentration decreased, the mass transfer resistance increased with the decrease of copper concentration and the mass transfer coefficient decreased with the decrease of copper concentration.