金属离子负载聚醚共聚乙酰胺（PEBAX）膜的制备及渗透汽化分离噻吩研究

发布时间：2018-07-09 16:21

  本文选题：金属离子 + PEBAX膜　； 参考：《广西大学》2015年硕士论文

【摘要】：近年来,环境污染的加重及环保意识的提高,使得研发出经济有效的汽油脱硫方法迫在眉睫,渗透汽化脱硫技术越来越得到重视。本研究选择聚醚共聚乙酰胺(PEBAX2533)作为膜的分离层材料,以聚丙烯腈超滤膜(PAN)为支撑层,分别以纳米气相SiO2(n-SiO2)、微米固体SiO2(μ-SiO2)以及Ag+修饰的微米固体SiO2(Ag+SiO2)颗粒作为填充材料,制备填充型复合膜；并采用浸渍法制备了Ag+、Mn2+负载复合膜。分别进行了溶胀和渗透汽化实验,旨在分离模拟汽油正庚烷/噻吩中的噻吩。利用FTIR、XRD以及SEM,对μ-SiO2和Ag+-SiO2颗粒的形貌特征进行了表征,FTIR和XRD分析结果表明：Ag+成功负载于μ-SiO2颗粒上,SEM分析显示所制备的颗粒为形状规则的球体,直径约为200nm。膜的SEM结果显示,颗粒均匀分散于膜的分离层中,无团聚现象,复合膜的分离层与支撑层相容性良好,结合紧密。负载实验证明了Ag+、Mn2+成功负载于PEBAX/PAN复合膜上。溶胀实验结果显示,填充型复合膜及Ag+、Mn2+负载复合膜对噻吩都具有良好的溶解、吸附能力,膜的溶胀度与料液温度、噻吩含量以及填充量有关,溶胀度随着温度的升高及噻吩含量的增高而增大；当Ag+-SiO2颗粒填充量为8wt%时,填充型复合膜的溶胀度达到最大。渗透汽化实验对膜分离噻吩的能力进行了考察,结果表明：随着料液温度及噻吩含量的增加,总渗透通量增大,分离因子下降；在30℃、待分离液噻吩浓度为1000}μg·g-1条件下,Ag+-SiO2填充型复合膜的填充量为8wt%时,分离效果最好,总渗透通量为5.627kg·m-2·h-1,对应的分离因子为3.78；Ag+和Mn2+负载复合膜的通量分别为7.5kg·m-2·h-1、7.7kg·m-2·h-1,相应的分离因子都为3.7。综上所述,Ag+SiO2填充型复合膜和Ag+、Mn2+负载复合膜,有效改善了膜的分离效果。其中,同等实验条件下,Mn2+负载复合膜的分离效果最优。
[Abstract]:In recent years, with the aggravation of environmental pollution and the improvement of environmental awareness, it is urgent to develop an economical and effective desulfurization method for gasoline, and more attention has been paid to the technology of osmotic vaporization desulfurization. Polyether copolymerization acetamide (PEBAX2533) was used as the separation layer, polyacrylonitrile ultrafiltration membrane (pan) was used as the supporting layer, and nano-gas phase Sio _ 2 (n-SiO _ 2), micron solid Sio _ 2 (渭 -SiO _ 2) and Ag modified micron solid Sio _ 2 (Ag Sio _ 2) particles were used as filling materials, respectively. The filled composite membrane was prepared, and Ag mn 2 loaded composite membrane was prepared by impregnation method. The experiments of swelling and pervaporation were carried out to separate thiophene from n-heptane / thiophene. The morphologies of 渭 -SiO _ 2 and Ag -SiO _ 2 particles were characterized by FTIR XRD and SEM. The results of FTIR and XRD showed that the particles deposited on 渭 -SiO _ 2 particles were characterized by SEM, and the diameter of the particles was about 200 nm. The SEM results showed that the particles were uniformly dispersed in the separation layer without agglomeration. The separation layer of the composite membrane had good compatibility with the supporting layer and its binding was tight. The loading experiment proved that Ag / mn _ 2 was successfully loaded on PEBAX / pan composite film. The swelling test results show that both the filled composite membrane and the Ag / Mn2 supported composite membrane have good solubility and adsorption ability to thiophene, and the swelling degree of the film is related to the temperature of the feed solution, the content of thiophene and the filling amount. The swelling degree increases with the increase of temperature and thiophene content, and the swelling degree of the filled composite film reaches the maximum when the content of Ag -SiO 2 particles is 8 wt%. The capability of membrane separation of thiophene was investigated by pervaporation experiment. The results showed that the total permeation flux increased and the separation factor decreased at 30 鈩，

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