海藻酸钠-醋酸纤维素复合薄膜的制备及除湿性能测试

发布时间：2018-05-30 09:16

  本文选题：复合材料 + 膜　； 参考：《化工学报》2017年01期

【摘要】：为提高膜式全热交换器的除湿效率,以海藻酸钠为表面活性层,醋酸纤维素膜为支撑层,氯化锂为亲水添加剂制备了一种新型除湿复合膜。测试了复合膜的水蒸气透过量和水溶性,对薄膜结构进行表征及分析了应用复合膜的全热交换器的传质系数。研究结果表明:复合膜的水蒸气透过量随氯化锂含量增加而高达4.42×10~(-5)g·m~(-2)·s~(-1)·Pa~(-1),是无氯化锂复合膜的1.56倍,商用纸膜的2.63倍。表面活性层水溶性介于18.29%~28.55%之间,具有一定的防水耐水性。热重曲线表明通入55℃干燥空气复合膜可实现再生,红外光谱图显示出海藻酸钠为复合膜引进大量亲水性羟基。最后,将复合膜应用到全热交换器中,并与商用纸膜换热器在传质系数上进行了分析比较。
[Abstract]:In order to improve the dehumidification efficiency of membrane heat exchanger, a new dehumidifying composite membrane was prepared with sodium alginate as surface active layer, cellulose acetate membrane as supporting layer and lithium chloride as hydrophilic additive. The water vapor transmittance and water solubility of the composite membrane were measured. The structure of the film was characterized and the mass transfer coefficient of the total heat exchanger using the composite membrane was analyzed. The results show that the water vapor transmittance of the composite membrane is as high as 4.42 脳 10 ~ (-5) g / m ~ (-1) Li ~ (-1) Pao ~ (-1) with the increase of lithium chloride content, which is 1.56 times of that of non-lithium chloride composite membrane and 2.63 times of commercial paper film. The water solubility of the surface active layer is between 18.29% and 28.55%. The thermogravimetric curves show that the composite membrane can be regenerated by dry air at 55 鈩，

本文编号：1954752