细菌纤维素膜渗透汽化分离二元有机物水溶液

Pervaporation of binary organic aqueous solution based on bacterial cellulose membrane

采用动静结合的方式制备出了细菌纤维素膜。以乙醇水溶液、丙酮水溶液、乙酸水溶液为研究对象,研究了渗细菌纤维素膜的吸附性能,并讨论了透汽化过程中原料液浓度、温度对分离效果的影响及渗透汽化过程中可能的分离机理。结果表明,细菌纤维素膜能够优先透水,在渗透汽化分离乙醇和丙酮时,渗透通量随浓度的上升呈下降的趋势,温度对渗透通量的影响基本符合Arrhenius方程渗透汽化分离二者时,分离因子随浓度的增加先增加后减小。渗透汽化分离乙酸时,渗透通量随浓度的上升呈先上升后下降的趋势,分离因子变化不明显,温度对渗透通量的影响偏离Arrhenius方程较明显。

Bacterial cellulose（ BC） membrane were prepared by means of dynamic and static combination.The effects of feed concentration and feed on flux and selectivity of BC pervaporation membrane for separating ethanol,acetone,acetic acid from ethanol / water,acetone / water,acetic acid / water were investigated. The swelling properties of BC membrane in ethanol,acetone,acetic acid were also examined. The results indicated that the permeation flux decreased with the increasing of feed concentration,the separation factor increased first and then decreased,temperature and separation flux conforms to Arrhenius equation when separating ethanol or acetone. When separating acetic acid,separation flux increased first and then decreased with the increasing of feed concentration,the separation factor changed unobvious,temperature and separation flux deviated from Arrhenius equation obviously.