摘要
用石英弹簧法测定了298.15 K、308.15 K和313.15 K下乙醇和水在聚酰亚胺膜中的吸收平衡数据和吸收解吸动力学数据,结果表明乙醇和水在聚酰亚胺膜中以吸附态和溶解态两种形式存在;乙醇和水在膜中的传质过程比较复杂,既有费克扩散类型也有非费克扩散类型;含交联剂的聚酰亚胺膜对水有溶解选择性,乙醇的解吸速度受交联剂的影响较大,表明交联剂的加入有利于提高聚酰亚胺膜的分离性能。
The equilibrium solubility and sorption/desorption curves for alcohol and water in a kind of polyimide membrane with and without crosslinking agent at 298. 15 K, 308. 15 K and 313. 15 K are measured by quartz-springs weighing method. Results show that both adsorbed and dissolved states of alcohol and water exist in this kind of polyimide membrane. Fickian diffusion or anomalous diffusion are found under different conditions. Crosslinking agent added to membrane can enhance the solubility of water and decrease the desorption rate of alcohol. It is shown that the crosslinking agent can improve the separation properties of polyimide membrane.
出处
《化工学报》
EI
CAS
CSCD
北大核心
1997年第5期517-523,共7页
CIESC Journal
基金
国家自然科学基金资助项目(No.29506044)
关键词
膜分离
渗透
蒸发
聚酰亚胺
吸收
解吸
乙醇
水
membrane separation, pervaporation, polyimide, sorption, desorption, diffusion
