盐酸处理聚酰胺耐溶剂复合纳滤膜的性能研究  

Effect of hydrochloric acid treatment on properties of polyamide nanofiltration membrane with solvent resistance

作　　者：何晓 HE Xiao(School of Chemical Engineering,Tianjin University,Tianjin 300350,China)

机构地区：[1]天津大学化工学院,天津300350

出　　处：《化学工程》2018年第10期69-73,78,共6页Chemical Engineering(China)

摘　　要：随着有机溶剂在石油化工、精细化工以及制药工业领域的广泛应用,耐溶剂纳滤膜的发展显得日益重要。首先用对苯二甲胺(XDA)和乙二胺(EDA)的混合二胺交联聚醚酰亚胺(PEI)基膜,得到耐溶剂复合纳滤膜的支撑层。然后采用一步法,以1,2,4,5-均苯四甲酰氯(BTC)的正己烷溶液为油相单体与支撑层表面游离的端胺基界面聚合反应,得到耐溶剂复合纳滤膜的分离层。最后用盐酸处理复合膜表面,提高其分离性能,并用红外,XPS,SEM等表征手段对膜进行分析。对盐酸处理前后的复合膜进行孔径分布、分盐、稳定性对比实验,结果表明:经过盐酸处理,复合膜对N,N-二甲基甲酰胺(DMF)的通量增加1倍,对孟加拉红(RB)的截留率保持在95%以上。The development of solvent-resistant nanofiltration membranes has become increasingly important,with the wide application of organic solvents in the petrochemical,fine chemical and pharmaceutical industries.First,a crosslinked poly(ether imide)(PEI)material with solvent resistance was synthesized using mixed amines of ethylenediamine(EDA)and p-xylylenediamine(XDA)as support layer for solvent resistant composite nanofiltration membrane.Next,the separation layer of organic solvent nanofiltration(NF)membrane was prepared via the interfacial polymerization of the monomer 1,2,4,5-benzene tetracarbonyl chloride(BTC)and the amine terminals on the crosslinked PEI.Finally,the surface of the composite membrane was treated with hydrochloric acid to improve its separation performance and the membrane was analyzed with ATR-FTIR,XPS,SEM,etc.The pore size distribution,salt separation,and stability experiments were performed about the composite membranes before and after hydrochloric acid treatment.The results indicated that the permeance of composite membrane for N,N-dimethyl formamide(DMF)increased by 1 time,and the rejection of Red Bengal(RB)remained above 95%after hydrochloric acid treatment.

关 键 词：混合二胺 耐溶剂纳滤膜 盐酸 聚醚酰亚胺 

分 类 号：TQ31[化学工程—高聚物工业]