不同结构聚砜超滤膜对聚乙二醇的过滤性能研究

第33卷第5期膜科学与技术Vol. 33 No. 52013年10月MEMBRANE SCIENCE AND TECHNOLOGYOct.2013不同结构聚砜超滤膜对聚乙二醇的过滤性能研究严昊，徐建，潘国元，张杨，郭敏，张龙贵，苗小培，刘轶群"(中国石油化工股份有限公司北京化工研究院材料科学研究所,北京100013)摘要:以N,N-二甲基甲酰胺(DMF)、N,N-二甲基乙酰胺(DMAc)、N-甲基吡咯烷酮(NMP)为溶剂,水为非溶剂,制备了不同结构的聚砜超滤膜,并考察其对超滤膜过滤性能测试体系一聚乙二醇水溶液的过滤性能.发现纯水通量主要是由超滤膜表面的孔结构所决定,孔径越大通量越高;聚乙二醇水溶液的过滤性能由膜表面的孔结构和截面结构所决定,膜表面的孔径越小、截面是海绵结构的超滤膜的截留率越高.并且通过理论模拟与动态激光光散射的数据比较,发现聚乙二醇的分子链在经过超滤膜时形态发生了明显变化.关键词:聚砜;超滤膜;通量;截留率中图分类号: TQ028. 8文献标志码: A文章编号: 1007 -8924(2013)05-0043-05聚砜是一种性能优良的高聚物,耐水解,很适合到了 ~些对分析聚砜超滤膜性能参数有指导意义的在工业上应用于膜材料的开发与应用.目前,过滤领结论.域主要在两大方向使用聚砜材料(-),一个是超滤膜1试验部分方向4],另一个是做复合纳滤和反渗透膜的支撑基膜[5].虽然这两种聚砜膜的制备工艺都是采用非溶1.1试验材料与仪器剂浸泡的相转化法,但是其对结构和性能的要求却聚砜: Solvay Udel3700; PEG10000: Alfa Aesar,不尽相同.其中超滤膜的研究方向主要是截留率与Mw = 100 000; PEG40000:Alfa Aesar,M =40 000;F、通量的调控,和抗污染性能的提高.而基膜主要研究DMAc、NMP均选自北京化学试剂厂,分析纯.的是其表面结构和界面聚合的匹配性,其本身截留美国Brookhaven公司的BI-200SM型动静态率和通量性能对最终复合膜的性能影响较小.对于激光光散射仪,532nm固体激光光源，BI-APD检测超滤膜而言,其过滤的主要是其他分离技术难以完器;日本日立公司的场发射扫描电镜S-4800;国产成的胶状悬浮液,大分子在溶剂中形态的复杂性造DKN-40型平板刮膜机;美国Amicon8200死端式成了超滤膜截留性能的不确定性，线性高分子如聚过滤单元.乙二醇的截留率往往低于相同分子量的球型蛋白高1.2聚砜超滤膜的制备分子[6].将18%聚砜分别溶于DMF .DMAc.NMP的3本工作采用了最常使用的超滤膜过滤性能测试种溶剂中,完全溶解后静置72h,并用真空烘箱脱体系-聚乙二醇(PEG)水溶液进行研究,通过动态泡15 min,之后使用平板膜刮膜机在无纺布上连续激光光散射(DLS)对其形态进行了表征.以DMF、刮涂厚度为250 pμm的高分子溶液，并立即浸人DMAc、NMP为溶剂,水为非溶剂，制备了不同结构20 C的水浴中成膜.的聚砜超滤膜,分别考察其对PEG水溶液的过滤性1.3纯水通和PEG截留率测试能根据实验结果探讨了不同溶剂对聚砜超滤膜结将制备好的聚砜超滤膜放置于死端式过滤单元构和性能的影响,并对实验数据进行了理论模拟,得中测试纯水通量和截留率.首先将超滤膜在0.2MPa收稿日期: 2012-12-17第- -作者简介:严昊(1984-), 男，安徽人,博士,工程师,主要研究方向为中国煤化工. *通讯作者，E-mail: liuyq. bjhy@sinopec. comMYHCNMH G第5期严吴等: 不同结构聚砜超滤膜对聚乙二醇的过滤性能研究effects of defects in ultrafiltration membranes on the[12] Kerry J, Mark M. Fouling of microfiltration and ultra-water flux and the molecular weight cut off[J]. Desali-filtration membranes by natural waters[J]. Environnation, 2002,149:485- 491.Sci Technol, 2002, 36(16):3571 - -3576.The Filtration Properties for PEG Solutions of Different StructuresPolysulfone Ultrafiltration MembranesYAN Hao, XU Jian, PAN Guoyuan, ZHANG Yang,GUO Min, ZHANG Longgui, MIAO Xiaopei ,LIU Yiqun(Division of Material Science, SINOPEC Beijing Research Institute ofChemical Industry, Bejjing 100013, China)Abstract: DMF、DMAc、NMP have been used as solvent for polysulfone, and water as non-solvent toproduce ultrafiltration membranes with different structures. The filtration properties have been tested withPEG Solutions. The results showed that the fluxes of pure water for these membranes are determined withthe holes' structures on surface, and it increased with enlarging holes diameter. The rejection data showedthat both screen and depth filter mechanism worked to PEG molecules, the rejection increased withdecreasing the holes diameter and the volume of finger structures. Combined with the theoretic analysisand the data from dynamic light scattering of PEG solutions, we found out that the shape of PEGmolecules changed dramatically near the holes on the surface of ultrafiltration membranes.Key words: polysulfone; ultrafiltration; flux; rejection(上接第18页)Analysis of membrane fouling and mechanism of proteinand Maillard products in fermentation brothLI Chunyan' , LI Xiaoqing', J IANG Mingzhang'，HONG Yubin', FANG Yongzheng2(1. College of Pharmacy, Fujian Medical University, Fuzhou 350004, China;2. Suntar Membrane Technology (Xiamen) Co. Ltd, Xiamen 361022, China)Abstract: In this paper, protein and Maillard products in a simulated fermentation broth on membranefouling of polyethersulfone Ultrafiltration membranes were studied, mainly studied the concentrations andoperating temperature and pressure on Membrane fouling. Five parts of membrane resistance and itsdistribution were analysised. It was found that, membrane flux decreased more quickly at higherconcentration, but membrane resistance increased quickly; rising the operating temperature and pressurecould increase the membrane flux，also increase resistances and the various parts of the resistance and itdistribution changed significantly. Membrane resistances increased and membrane fouling increasedobviously after adding the glucose into the protein and produce the Maillard reaction.Key words: Protein; maillard products; ultrafiltration; membrane f(中国煤化工ances; distri-bution of membrane resistancesHCNMHG