中空纤维 NaA 分子筛膜对乙醇蒸汽渗透深度脱水

This work investigated the deep dehydration process of ethanol solvent by vapor permeation technique of hollow fiber supported NaA zeolite membrane using the combined operations of N₂ sweeping and vacuum suction. The results indicated sweeping gas plays a dominant role in the deep dehydration of ethanol. Compared with the case without any sweeping (under an operation temperature of 100 ℃ and a feeding liquid flow rate of 30 mL·min^-1), the N₂ sweeping with a flow rate of 60 mL·min^-1 could promote the membrane dehydration efficiency by several folds, where the production efficiency was enhanced by 43% to obtain the ethanol with ultra-low water content of 0.04%. For a higher operation temperature of 120 ℃, the water content in ethanol could be further reduced to 0.068% when the feeding liquid flow rate increased to 50 mL·min^-1, where the harvest percentage was high up to 99.86%.