溶剂固定化聚砜微胶囊的制备及其稳定性

Preparation and stability of polysulfone microcapsules with organic solvent

为解决液液萃取过程中溶剂损失及两相返混问题 ,研究了相转化法溶剂固定化的制备技术。借鉴已有的微胶囊技术 ,选用聚砜 (PS)为膜材料、磷酸三丁酯 (TBP)为芯材的体系 ,用锐孔 -凝固浴法制备出球腔内包覆溶剂 TBP的聚砜微胶囊。讨论了聚合物溶液组成、过孔速度等因素对微胶囊的形态及结构的影响 ,并根据传质实验讨论其稳定性。结果表明 :聚砜质量分数在 10 %～ 15 %、 TBP质量分数为聚砜的 1.2～ 2倍的配比下 ,过孔速度控制在 3 m L.min-1左右 ,体积比为 1:1的乙醇 -水溶液为凝固浴制得的溶剂固定化微胶囊 ,其传质稳定性优于浸渍 TBP的 PS中空微球 。

Solvent loss and phase mixing require solvent immobilization. This paper studies the stability of solvent immobilized microcapsules prepared using the phase inversion method with tributyl phosphate (TBP) as the organic solvent and polysulfone (PS) as the membrane material. The effects of polymer composition and feed velocity in the process were investigated. The results show that with a solvent mass fraction, w PS , 10%~15%, a TBP mass fraction 1.2~2 times that of w PS , a solvent cross velocity of about 3 mL·min -1 , and an ethanol solvent volume ratio of 1∶1 as the solidification medium, the microcapsules' mass transfer stability is superior to that of solvent soaked hollow PS microspheres.