PVA、PVP和β -CD改性再生纤维素膜的制备及渗透汽化分离己内酰胺水溶液

江汉大学学报（自然科学版） ›› 2014, Vol. 42 ›› Issue (6): 27-34.

PVA、PVP和β -CD改性再生纤维素膜的制备及渗透汽化分离己内酰胺水溶液

朱天容，李忠铭，刘继延，王亮，胡思前^*，唐开

江汉大学化学与环境工程学院，湖北武汉 430056

出版日期:2014-12-25 发布日期:2014-12-26
通讯作者: 胡思前
作者简介:朱天容（1985—），女，讲师，博士，研究方向：高分子薄膜材料。
基金资助:
湖北省教育厅科学研究计划项目（B 2014066）；江汉大学博士科研启动经费项目（2012021）

Preparation of PVA ，PVP and β -CD Modified Regenerated Cellulose Membrane and Pervaporation Separation of Caprolactam- Water Mixtures

ZHU Tianrong，LI Zhongming，LIU Jiyan，WANG Liang ，HU Si qian^* ，TANG Kai

School of Chemistry and Enviromental Engineering，Jianghan University，Wuhan 430056，Hubei，China

Online:2014-12-25 Published:2014-12-26

摘要/Abstract

摘要： 己内酰胺（CPL）是重要的有机化工原料，对CPL脱水是除杂工艺中最后一步。然而，CPL是热敏性物质，为防止CPL高温分解，重点研究了渗透汽化膜分离技术对CPL脱水。以棉短绒为制膜原料，采用碱溶解方法，通过相转变制备了再生纤维素（RC）膜。研究了铸膜液浓度对膜结构的影响。铸膜液的最佳浓度为4 wt %，RC膜表面平滑、无孔，可作为渗透汽化膜，但纯RC膜的通量较小。因此，选取了聚乙烯醇（PVA）、聚乙烯吡咯烷酮（PVP）和β-环糊精（β-CD）分别对RC膜共混改性，考察了改性膜的溶胀度、接触角和渗透汽化膜分离性能。RC-PVA膜的机械强度、通量和分离因子均优于纯RC膜。β-CD提高了膜的分离因子，对通量影响较小。

关键词: 渗透汽化, 己内酰胺/水, 再生纤维素膜, 共混

Abstract: Caprolactam（C6H11NO）is one of the most important material in the polymer industry, dehydration is the most important edulcoration technology in the final caprolactam purification. However ，caprolactam is heat-sensitive substance, for prevention of degradation under high temperature, the dehydration of caprolactam with pervaporation (PVP) is studied. Cotton as membrane material and is firstly dessloved in the alkaline solution, then the regenerated cellulose（RC）is prepared by phase inversion method. The influence of concentration of casting solution on the membrane structure is investigated. The results show that the 4 wt % cellulose concentration is suitable to prepare the PV membrane. But the flux and separation factor of pure RC membrane are not ideal. Therefore ，polyvinyl alcohol（PVA ），Polyvinyl-Py-rrolidone（PVP ）and β -cyclodextrin （β-CD ）are selected to modify the RC membrane. The degree of swelling ，contact angle and PV performance of the modified membranes are tested. RC-PVA has better properties and the strength ，the flux and the separation factor are improved. With the addition of β -CD ， the separation factor of membrane is enhanced, and it has a little influence on flux.

Key words: pervaporation , caprolactam-water mixtures , regeneration cellulose membrane , blend

中图分类号:

TQ341

朱天容，李忠铭，刘继延，王亮，胡思前，唐开. PVA、PVP和β -CD改性再生纤维素膜的制备及渗透汽化分离己内酰胺水溶液[J]. 江汉大学学报（自然科学版）, 2014, 42(6): 27-34.

ZHU Tianrong，LI Zhongming，LIU Jiyan，WANG Liang ，HU Si qian ，TANG Kai. Preparation of PVA ，PVP and β -CD Modified Regenerated Cellulose Membrane and Pervaporation Separation of Caprolactam- Water Mixtures[J]. Journal of Jianghan University(Natural Science Edition), 2014, 42(6): 27-34.

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