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研究了Ｈ２ＳＯ４对壳聚糖（ＣＳ）膜醇水分离性能的影响．结果表明，Ｈ２ＳＯ４使ＣＳ上的—ＮＨ２质子化为—ＮＨ＋３，降低了极性较差的乙醇分子进入膜内的能力，提高了膜对水分子的吸附选择性．又因为ＳＯ２－４可以与２个—ＮＨ＋３作用，使部分ＣＳ链产生交联，缩小了分子透过的通道．由于乙醇分子比水分子大，故大大提高了膜对水的渗透选择性．所以，Ｈ２ＳＯ４能提高ＣＳ膜的醇水分离性能是以上两种因素综合作用的结果．
The effect of H2SO4 on the separation of chitosan (CS) film from alcohol and water was studied. The results showed that H2SO4 protonated -NH2 on CS to -NH + 3, which reduced the ability of ethanol molecules with poorer polarity to enter into the membrane and increased the selectivity of membrane to water molecules. And because SO2-4 with two -NH +3 role, so that part of the CS chain cross-linked, reducing the passage of molecules through. As ethanol molecules than water molecules, it greatly improves the membrane permeability of water selectivity. Therefore, H2SO4 can improve the performance of alcohol-water CS membrane separation is the result of the combined effect of the above two factors.