混合溶剂制备醋酸纤维素膜及其性能

Preparation and Performance of Cellulose Acetate Membrane with Mixed Solvents

以醋酸纤维素、丙酮、N-甲基吡咯烷酮(NMP)和聚乙二醇400(PEG-400)为原料,采用相转化法制备醋酸纤维素膜,对其结构和形貌进行了表征;在室温、操作压力0.1 MPa下,用去离子水和500 mg/L PEG-600溶液分别测定膜的水通量和截留率,考察了混合溶剂中丙酮和NMP含量、反应温度和致孔剂PEG-400含量对醋酸纤维素膜性能的影响.结果表明,NMP含量60%(w)、丙酮含量22.5%(w)、反应温度60℃及PEG-400含量6%(w)条件下,所制醋酸纤维素膜表面光滑,孔径分布均匀,水通量达212.87 L/(m^2×h),截留率达87.67%.

Cellulose acetate（CA） membrane was prepared by liquid-solid phase inversion method with cellulose acetate, acetone, N-methylpyrrolidone（NMP） and polyethylene glycol 400（PEG-400） as raw materials. The structure and morphology of CA membrane were characterized. At room temperature, the prepared CA membrane was used to treat deionized water and 500 mg/L polyethylene glycol 600 under the pressure of 0.1 MPa in its water flux and rejection rate, respectively. The effects of mixed solvent content, reaction temperature and PEG-400 content on the separation properties of membrane were examined. The results showed that under the conditions of NMP and PEG-400 contents of 60% and 6%（ω）, and reaction temperature of 60 ℃, the prepared CA membrane surface was smooth and the pore size distribution uniform, its water flux was 212.87 L/（m^2·h）, and the rejection rate 87.67%.