P84共聚聚酰亚胺-聚乙烯吡咯烷酮/聚丙烯腈复合膜的制备及其渗透汽化分离甲醇/四氢呋喃

doi:10.16085/j.issn.1000-6613.2018-0056

化工进展 ›› 2019, Vol. 38 ›› Issue (02): 971-978.DOI: 10.16085/j.issn.1000-6613.2018-0056

P84共聚聚酰亚胺-聚乙烯吡咯烷酮/聚丙烯腈复合膜的制备及其渗透汽化分离甲醇/四氢呋喃

戚律(),周元冲,徐荣,张琪,钟璟()

常州大学石油化工学院，江苏省绿色催化材料与技术重点实验室，江苏常州213164

收稿日期:2018-01-05 修回日期:2018-03-25 出版日期:2019-02-05 发布日期:2019-02-05
通讯作者: 钟璟
作者简介:<named-content content-type="corresp-name">戚律</named-content>（1983—），男，博士，讲师。E-mail：<email>qilv1983@cczu.edu.cn</email>。|钟璟，教授，主要从事膜分离和分子模拟等研究。E-mail：<email>zjwyz@cczu.edu.cn</email>。
基金资助:
中国石油化工股份有限公司科技项目(216078);常州大学校基金(zmf15020101);江苏省先进催化与绿色制造协同创新中心项目(常州大学)

Preparation of P84 copolyimide-polyvinylpyrrolidone/polyacrylonitrile composite membranes for separation of methanol/tetrahydrofuran by pervaporation

Lü QI(),Yuanchong ZHOU,Rong XU,Qi ZHANG,Jing ZHONG()

Jiangsu Key Laboratory of Advanced Catalytic Materials and Technology, School of Petrochemical Engineering, Changzhou University, Changzhou 213164, Jiangsu, China

Received:2018-01-05 Revised:2018-03-25 Online:2019-02-05 Published:2019-02-05
Contact: Jing ZHONG

摘要/Abstract

摘要：

通过聚乙烯吡咯烷酮（PVP）与P84共聚聚酰亚胺（P84）共混，以聚丙烯腈（PAN）超滤膜为支撑层，制备了不同PVP含量的P84-PVP/PAN复合膜。采用傅里叶红外光谱（FTIR）、X射线衍射（XRD）、扫描电镜（SEM）、差示扫描量热仪（DSC）和接触角（CA）测量等方法对复合膜进行表征。FTIR分析表明，PVP与P84为物理共混。DSC结果显示共混物存在单一玻璃化转变温度，具有良好相容性。此外，水接触角测试显示PVP引入提高了膜亲水性。XRD结果表明，随着PVP含量的增加，共混物分子链平均间距增大，膜内自由体积增大。考察了PVP含量、操作温度及料液浓度对渗透汽化分离甲醇/四氢呋喃性能的影响。结果表明，随着共混物中PVP质量分数增加至20%，膜渗透通量逐渐增大，分离因子先增加（PVP质量分数≤ 10%）而后迅速降低。当PVP质量分数为10%、进料温度为20℃时，复合膜对于质量分数30%甲醇/四氢呋喃有最优的分离性能，其渗透通量为259g/(m²?h)，分离因子为41。

关键词: 聚酰亚胺, 聚乙烯吡咯烷酮, 共混膜, 渗透汽化

Abstract:

Polyvinylpyrrolidon （PVP）-P84 copolyimide（P84） / polyacrylonitrile（PAN） composite membranes were prepared via blending of PVP into P84 matrix. Membranes were characterized by Fourier transform infrared（FTIR），X-ray diffraction（XRD），scanning electron microscopy（SEM），differential scanning calorimeter（DSC） and contact angle（CA） metering. FTIR analysis indicated that PVP and P84 were physically blended. DSC results showed that the P84-PVP blends possessed a single glass-transition temperature， indicating a good miscibility of blend. The contact angle test demonstrated that the hydrophility of membranes was improved with the incorporation of PVP. XRD results indicated that d-spacing in the P84-PVP blend was increased when the PVP loading amount was increased. The effect of PVP loading，operating temperature and feed composition on the pervaporation performance of the composite membranes was examined. When PVP content was enhanced to 20%， the total permeation flux was increased. Meanwhile，the separation factor was first increased with the PVP content≤ 10%，and then decreased quickly. The composite membrane with a PVP loading amount of 10% exhibited the best performance with a total flux of 259g/(m²?h) and a separation factor of 41 using a feed of methanol（30%）/tetrahydrofuran at 20℃.

Key words: co-polyimide, polyvinylpyrrolidone, blend membrane, pervaporation

中图分类号:

TQ028.8

戚律, 周元冲, 徐荣, 张琪, 钟璟. P84共聚聚酰亚胺-聚乙烯吡咯烷酮/聚丙烯腈复合膜的制备及其渗透汽化分离甲醇/四氢呋喃[J]. 化工进展, 2019, 38(02): 971-978.

Lü QI, Yuanchong ZHOU, Rong XU, Qi ZHANG, Jing ZHONG. Preparation of P84 copolyimide-polyvinylpyrrolidone/polyacrylonitrile composite membranes for separation of methanol/tetrahydrofuran by pervaporation[J]. Chemical Industry and Engineering Progress, 2019, 38(02): 971-978.

图/表 14

参考文献 29

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膜编号	溶胀度/%	接触角/（°）
P84-PVP-0	8.4	71
P84-PVP-5	12.2	65
P84-PVP-10	13.6	54
P84-PVP-15	15.6	48
P84-PVP-20	18.2	42

膜编号	溶胀度/%	接触角/（°）
P84-PVP-0	8.4	71
P84-PVP-5	12.2	65
P84-PVP-10	13.6	54
P84-PVP-15	15.6	48
P84-PVP-20	18.2	42

膜种类	甲醇质量分数	温度/℃	渗透通量/g·m^-2·h^-1	膜厚/μm	分离因子	参考文献
PVA-CA膜	甲醇（15%）/MTBE	45	76	40	564	[3]
CS交联膜	甲醇（20%）/MTBE	25	2351	0.4	9	[6]
CA膜	甲醇（30%）/MTBE	30	44	25	553	[5]
PVA-PVP共混膜	甲醇（20%～80%）/四氢呋喃	20	253～2458	30	38～16	[4]
P84-PVP/PAN复合膜	甲醇（5%～40%）/四氢呋喃	20	98～291	35	110～32	本文

膜种类	甲醇质量分数	温度/℃	渗透通量/g·m^-2·h^-1	膜厚/μm	分离因子	参考文献
PVA-CA膜	甲醇（15%）/MTBE	45	76	40	564	[3]
CS交联膜	甲醇（20%）/MTBE	25	2351	0.4	9	[6]
CA膜	甲醇（30%）/MTBE	30	44	25	553	[5]
PVA-PVP共混膜	甲醇（20%～80%）/四氢呋喃	20	253～2458	30	38～16	[4]
P84-PVP/PAN复合膜	甲醇（5%～40%）/四氢呋喃	20	98～291	35	110～32	本文

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P84共聚聚酰亚胺-聚乙烯吡咯烷酮/聚丙烯腈复合膜的制备及其渗透汽化分离甲醇/四氢呋喃

Preparation of P84 copolyimide-polyvinylpyrrolidone/polyacrylonitrile composite membranes for separation of methanol/tetrahydrofuran by pervaporation

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