摘要
采用聚酰亚胺和磺化聚芳醚砜共混改性的中空纤维膜，研究了在不同操作条件下对压缩空气的脱湿性能，并以此作为吹扫气源，研究了在气流吹扫操作方式下蒸汽渗透法乙醇气相脱水过程，实验结果表明，膜的脱水性能与膜材料的亲水性有关，控制共混比例可以得到综合性能优良的气体脱湿膜。在压缩空气脱湿过程中，提高操作压力和气流回扫比对降低产品气的露点是有利的，在０．３５ＭＰａ的操作压力下，可得到露点低于－２５℃的产品空气。在乙醇气相脱水过程中，采用干燥的吹扫气流并增加吹扫气流的速率对提高水／醇分离系数是十分必要的，当采用合适的操作条件时，改性聚酰亚胺中空纤维膜的水／醇分离系数可达１５０～２００。
The hollow fiber membranes were prepared from polyimide and its blend with solfonated vapor permeation. The experimental results indicated that the dehydration property of membranes is relative with the hydrophilicity of membrane materials and good performance of membrane can be obtained by using appropriate blend ratio. In the dehumidification of air, elevated operation pressure and higher back sweep ratio are advantageous to the production of dry air. The product air with the dew point below -25 ℃ can be obtained under the operation pressure of 0.35 MPa. In the dehydration of ethanol, a dry sweep airflow with high velocity is necessary for enhancement of the water/ethanol separation coefficient. Under appropriate operation condition, the water/ethanol seperation coefficient about 150-200 can be obtained for the modified polyimide hollow fiber membranes.
出处
《功能高分子学报》
CAS
CSCD
1999年第1期61-64,共4页
Journal of Functional Polymers
基金
国家自然科学基金
关键词
蒸汽渗透
乙醇
气相脱水
聚酰亚胺
中空纤维膜
dehumidification of gas
vapor permeation
gas phase dehydration of ethanol
polyimide hollow fiber
