PVA／PAN渗透汽化膜分离乙酸乙酯-乙醇-水体系的研究

Study on PVA/PAN pervaporation membrane for the separation of ethyl acetate-ethanol-water system

采用相转化法制备了平板PAN超滤膜，并采用涂覆法制备了酒石酸交联的PVA／PAN复合膜．利用红外谱图和扫描电镜对复合膜表面化学组成及膜结构进行了分析和表征．同时，以乙酸乙酯-乙醇-水体系为研究对象，分别研究了交联剂的含量以及料液温度等对复合膜性能的影响．结果表明在同一温度下，交联剂含量增加，膜的溶胀度减小，渗透通量减小，选择性增高．随温度的升高，渗透通量增大，而选择性降低．在30～50℃的料液温度下，复合膜的总通量为30～150g／（m^2·h），分离因子可达480～29000．

PAN ultrafiltration membrane was prepared via phase inversion on the plate membrane machine. PVA solution was coated on PAN membrane and crosslinked using TAC as crosslinking agent to prepare PAN - PVA composite membrane. The ATR - FTIR spectra and SEM were carried out to analyze the surface chemical composition and morphology of the composite membranes. The effects of crosslinking agent content as well as feed temperature on PVA/PAN membrane performance were also studied on the pervaporation of ethyl acetate- ethanol-water. The experimental results showed that under the identical temperature, as crosslinking agent content increased, swell reduced as well as the pervaporation flux, but the selectivity increased; and as the increase of feed temperature, the pervaporation flux increased while the selectivity reduced. The composite membranes operated at 30-50 ℃ had a total flux of 30-150 g/（m^2·h） with a high selectivity between 480 and 29 000.