聚二甲基硅氧烷膜的制备、改性及脱硫性能研究

发布时间：2018-05-05 17:12

  本文选题：PDMS膜 + 渗透汽化　； 参考：《西北大学》2017年硕士论文

【摘要】：中国车用汽油中的有机硫化物75%以上来自催化裂化汽油(FCC)调和组分。有机硫化物燃烧后会产生SOx等有害物质,严重污染环境。因此,对FCC汽油进行深度脱硫迫在眉睫。渗透汽化膜法脱硫是一种新型的脱硫方法,分离效率高、能耗低、环境友好,膜法脱硫的核心是膜材料。聚二甲基硅氧烷(PDMS)是一种应用较广的渗透汽化膜材料,具有较好的脱硫性能。本文系统地研究了交联剂对PDMS膜脱硫性能的影响,在此基础上,通过填充CPO-27-Ni这种金属有机骨架(metal organic framework,MOF)材料,进一步提高了 PDMS膜的脱硫性能。本文首先制备了 3种不同交联剂交联的PDMS/PVDF复合膜。3种交联剂分别为3-氨丙基三甲氧基硅烷(APTMS)、3-缩水甘油基氧基丙基三甲氧基硅烷(GPTMS)和3-巯基丙基三甲氧基硅烷(MPTMS)。采用傅立叶红外光谱仪(FTIR-ATR),X射线光电子衍射(XPS),扫描电子显微镜(SEM),静态拉伸试验,溶胀实验和表面剥离实验对所制备的PDMS/PVDF膜进行系统分析、表征。研究结果表明A-PDMS具有最高的交联密度,极佳的抗溶胀性和与底膜良好的结合力;同时,系统考察了不同操作温度和有机硫化物含量对PDMS/PVDF膜脱硫性能的影响。渗透汽化实验结果表明:一、在45℃,A-PDMS膜的富硫因子最高,达到3.46;二、M-PDMS膜的渗透通量最高,达到 21.19 kg/(m2·h)。随后,将CPO-27-Ni颗粒填充到APTMS交联的PDMS基体中,制备出CPO-27-Ni填充的PDMS混合基质膜(mixed matrix membranes,MMMs)用于渗透汽化脱硫。采用SEM,X-ray粉末衍射(XRD)和N2吸脱附对CPO-27-Ni粒子进行结构表征;通过SEM,XRD,热重量分析(TGA)和溶胀实验对膜进行综合表征。随后,研究了不同CPO-27-Ni粒子填充量对PDMS膜渗透汽化脱硫性能的影响。实验发现,相比于PDMS膜,MOF/PDMS MMMs的渗透通量和富硫因子均显著增加。这主要是因为CPO-27-Ni粒子对噻吩的选择吸附性和其与PDMS膜基质的良好兼容性。当CPO-27-Ni粒子的填充量为6%时,富硫因子最高达到4.05,渗透通量为5.92 kg/(m2·h),与纯的PDMS膜相比,分别增加了 23.7%和68.7%。
[Abstract]:More than 75% of the organic sulfides in Chinese automotive gasoline come from FCC gasoline FCCs. SOx and other harmful substances will be produced after combustion of organic sulfides, which will seriously pollute the environment. Therefore, it is urgent to carry out deep desulfurization of FCC gasoline. Pervaporation membrane desulfurization is a new desulfurization method with high separation efficiency, low energy consumption and friendly environment. Membrane material is the core of membrane desulfurization. Polydimethylsiloxane (PDMS) is a widely used pervaporation membrane material with good desulfurization performance. In this paper, the influence of crosslinking agent on the desulfurization performance of PDMS membrane was systematically studied. On the basis of this, the desulfurization performance of PDMS membrane was further improved by filling CPO-27-Ni, a metal and organic framework metal organic frame work material. In this paper, three kinds of crosslinking agents of PDMS/PVDF composite membrane were prepared. The crosslinkers were 3- aminopropyl trimethoxy silane, 3- glycidyl oxy propyl trimethoxysilane) and 3-mercapto propyl trimethoxy silane, respectively. The PDMS/PVDF films were systematically analyzed and characterized by Fourier transform infrared spectroscopy (FTIR-ATR) X-ray photoelectron diffraction (XPS), scanning electron microscopy (SEM), static tensile test, swelling test and surface peeling test. The results showed that A-PDMS had the highest crosslinking density, excellent swelling resistance and good adhesion to the bottom film, and the effects of different operating temperature and organic sulfide content on the desulfurization performance of PDMS/PVDF membrane were systematically investigated. The results of pervaporation experiment showed that: first, the sulfur enrichment factor of the membrane was the highest (3.46) at 45 鈩，

本文编号：1848580