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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。
Polyimide and sulfonated poly (arylene ether sulfone) were used to modify the hollow fiber membrane. The dehumidification performance of compressed air under different operating conditions was studied and used as the purge gas source. The experimental results show that the dehydration performance of the membrane is related to the hydrophilicity of the membrane material. Controlling the blending ratio can obtain the gas dehydration membrane with excellent comprehensive performance. During compressed air dewetting, it is advantageous to increase the operating pressure and the air sweeper ratio to reduce the dew point of the product gas at a pressure of 0.35 MPa at which product air having a dew point below -25 ° C can be obtained. In the gas phase dehydration of ethanol, it is necessary to increase the water / alcohol separation factor by using a dry purge gas stream and increasing the purge gas flow rate. When suitable operating conditions are used, the modified polyimide hollow fiber membrane Water / alcohol separation factor of up to 150 ~ 200.