双水相胶束萃取苯酚

根据胶束的加溶原理和非离子表面活性剂系统在浊点温度以上自动分相的现象 ,采用TritonX - 10 0胶束系统萃取苯酚 .结果表明 :苯酚的比胶束加溶量与其在水相的平衡浓度成比例关系 .测定了比例系数 ,即加溶平衡常数 .由此建立了数学模型 ,讨论了表面活性剂浓度、溶质浓度、pH值等因素对萃取率的影响 .模型计算结果和实验结果都说明 ,调节pH值可以反萃取苯酚的原因是苯酚电离改变了加溶平衡常数

EXTRACTION OF PHENOL WITH TRITON X-100 TWO-PHASE AQUEOUS MICELLAR SYSTEM

According to solubilization of surfactant micelle and phase-separation of nonionic surfactant aqueous system induced by temperature, extraction of phenol with Triton X-100 two-phase micellar system was carried out. The results indicated that specific solubilization of phenol in the surfactant-rich phase was directly proportional to its concentration in the aqueous phase. The proportional coefficient (the equilibrium constant) was determined. On the basis of experiments, a model was proposed, which predicated extraction yield as a function of surfactant concentration, solute concentration and pH of system. It also explained that back-extraction of phenol from surfactant-rich phase to aqueous phase by adjusting the pH of system resulted from the change of proportional coefficient by ionization of phenol.