| PDMS动力粘度对PDMS/PVDF复合渗透汽化膜形貌及优先透醇性能影响 |
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| 引用本文： | 吴珍,田继兰,黄鲸慧,何欣平,李继定.PDMS动力粘度对PDMS/PVDF复合渗透汽化膜形貌及优先透醇性能影响[J].石油学报(石油加工),2021,37(2):345-351. |
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| 作者姓名： | 吴珍 田继兰 黄鲸慧 何欣平 李继定 |
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| 作者单位： | 1. 鄂尔多斯应用技术学院 化学工程系， 内蒙古 鄂尔多斯 017000；
2. 鄂尔多斯市紫荆创新研究院，内蒙古 鄂尔多斯 017000；
3. 清华大学 化学工程系 化学工程国家重点联合实验室，北京 100084 |
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| 基金项目： | 国家自然科学基金项目（21736001，21776153）, 内蒙古自治区科技计划项目(8262)，内蒙古自治区高等学校科学研究项目（NJZY19259）和内蒙古自治区自然科学基金项目（2019MS02029）资助 |
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| 摘 要： | 通过改变聚二甲基硅氧烷(PDMS)动力黏度，考察了PDMS/聚偏氟乙烯(PVDF)复合膜的表面及断面形貌及渗透汽化优先透醇性能。结果表明：随着PDMS动力黏度的减小，光滑的复合膜表面变得粗糙，褶皱内出现错杂的纹路，且由于涂膜液流动性增强，渗透至基膜孔中的涂膜液量增大，分离膜厚度减小。相比动力黏度(20 ℃)分别为2000和20000 mPa·s的PDMS制备得到的复合膜(PDMS/PVDF-2000和PDMS/PVDF-20000)，动力黏度(20 ℃)分别为5000和10000mPa·s的PDMS制备得到的PDMS/PVDF复合膜(PDMS/PVDF-5000和PDMS/PVDF-10000)表现出更高的分离因子和更大的渗透通量。随着操作温度的升高，PDMS/PVDF-5000和PDMS/PVDF-10000优先透醇分离因子先增大后减小，当操作温度为53 ℃时分离因子最大，分别达到10.47和10.23；渗透通量则呈现出随温度线性增长的趋势，在操作温度为69 ℃时，渗透通量最高分别达到3600.57和3845.76g/(m2·h)
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| 关 键 词： | 二甲基硅氧烷（PDMS）/聚偏氟乙烯（PVDF）复合膜 渗透汽化 优先透醇 表面形貌 分离因 渗透通量 |
| 收稿时间： | 2020-04-02 |
Effect of PDMS Dynamic Viscosity on Morphology and Ethanol Separation of PDMS/PVDF Composite Membrane |
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| WU Zhen,TIAN Jilan,HUANG Jinghui,HE Xinpin,LI Jiding.Effect of PDMS Dynamic Viscosity on Morphology and Ethanol Separation of PDMS/PVDF Composite Membrane[J].Acta Petrolei Sinica (Petroleum Processing Section),2021,37(2):345-351. |
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| Authors: | WU Zhen TIAN Jilan HUANG Jinghui HE Xinpin LI Jiding |
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| Affiliation: | 1. Department of Chemical Engineering, Ordos Institute of Technology, Erdos 017000, China;
2. Redbud Innovation Institution of Erdos, Erdos 017000, China;
3. The State Key Laboratory of Chemical Engineering, Department of Chemical Engineering, Tsinghua University, Beijing 100084, China |
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| Abstract: | The morphology of polydimethylsiloxane
(PDMS)/polyvinylidene fluoride (PVDF) composite membranes and their permeation
performance were investigated using various PDMS with different dynamic
viscosities. Experimental results showed that, for PDMS with lower dynamic
viscosity, smooth composite membrane surface could become rough, and intricate
lines appeared in the folds. In addition, due to enhanced fluidity of the
coating solution, pore penetration could increase and the thickness of
separation membrane reduced. PDMS/PVDF composite membranes prepared from PDMS
with dynamic viscosity (20 ℃) of 5000 mPa·s (PDMS/PVDF-5000) or 10000
mPa·s (PDMS/PVDF-10000)
indicated higher separation factor and larger osmotic flux than those prepared
from PDMS with dynamic viscosity (20 ℃) of 2000 mPa·s (PDMS/PVDF-2000) or 20000
mPa·s (PDMS/PVDF-20000). With
operation temperature going up, the separation factor of PDMS/PVDF-5000 and
PDMS/PVDF-10000 first increased and then declined with temperature. It was
found that, for PDMS/PVDF-5000 and PDMS/PVDF-10000, the largest separation
factor appeared at the operation temperature of 53 ℃ with separation factor
values of 10.47 and 10.23, respectively. However, the permeate flux increased
linearly with temperature. At operation temperature of 69 ℃, PDMS/PVDF-5000 and
PDMS/PVDF-10000 could reach the maximum permeation flux of 3600.57 and 3845.76
g/(m2·h), respectively. |
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| Keywords: | polydimethylsiloxane/polyvinylidene fluoride composite membrane pervaporation ethanol separation surface morphology separation factor permeation flux |
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