摘要
用Flory-Huggins溶液模型加Langmuir吸附模型的双重模式理论关联了前文测得的乙醇和水在聚酰亚胺膜中的平衡溶解度,根据吸收/解吸数据求取了扩散系数,溶解度系数及渗透率;用无限稀释理想分离因子评价渗透蒸发膜的分离性能.结果表明,聚酰亚胺中加入交联剂后,乙醇和水的扩散系数和渗透率都有明显的减小,但其无限稀释理想分离因子有所提高,分离性能有较大的改善.
The equilibrium solubility of alcohol and water in two polyimide membranes measured in a previous work is correlated by the dual - mode theory with Flory-Huggins solution model and Langmuir adsorption model. Diffusion coefficient - concentration relations are evaluated from experimental sorption and desorption curves. Solubility coefficients, permeabilities are then obtained. The infinite dilution ideal separation factor is used for the appraisal of separation performance of pervaporation membrane. It is shown that the diffusion coefficients and permeabilities of alcohol and water in the membrane containing crosslinking agent are less than in that without crosslinking agent. However, the infinite dilution ideal separation factors in the former are larger than that in the latter. The results indicate that the crosslinking agent can improve the performance of polyimide membrane for the separation of alcohol and water.
出处
《化工学报》
EI
CAS
CSCD
北大核心
1997年第5期524-531,共8页
CIESC Journal
基金
国家自然科学基金资助项目(No.29506044)
关键词
聚酰亚胺
溶解
渗透
蒸发
膜分离
乙醇
水
polyimide membrane
diffusion coefficient
penneability
solubility
pervaporation
