本文選題：PDMS膜 + 滲透汽化��； 參考：《西北大學(xué)》2017年碩士論文

【摘要】：中國車用汽油中的有機(jī)硫化物75%以上來自催化裂化汽油(FCC)調(diào)和組分。有機(jī)硫化物燃燒后會產(chǎn)生SOx等有害物質(zhì),嚴(yán)重污染環(huán)境。因此,對FCC汽油進(jìn)行深度脫硫迫在眉睫。滲透汽化膜法脫硫是一種新型的脫硫方法,分離效率高、能耗低、環(huán)境友好,膜法脫硫的核心是膜材料。聚二甲基硅氧烷(PDMS)是一種應(yīng)用較廣的滲透汽化膜材料,具有較好的脫硫性能。本文系統(tǒng)地研究了交聯(lián)劑對PDMS膜脫硫性能的影響,在此基礎(chǔ)上,通過填充CPO-27-Ni這種金屬有機(jī)骨架(metal organic framework,MOF)材料,進(jìn)一步提高了 PDMS膜的脫硫性能。本文首先制備了 3種不同交聯(lián)劑交聯(lián)的PDMS/PVDF復(fù)合膜。3種交聯(lián)劑分別為3-氨丙基三甲氧基硅烷(APTMS)、3-縮水甘油基氧基丙基三甲氧基硅烷(GPTMS)和3-巰基丙基三甲氧基硅烷(MPTMS)。采用傅立葉紅外光譜儀(FTIR-ATR),X射線光電子衍射(XPS),掃描電子顯微鏡(SEM),靜態(tài)拉伸試驗,溶脹實驗和表面剝離實驗對所制備的PDMS/PVDF膜進(jìn)行系統(tǒng)分析、表征。研究結(jié)果表明A-PDMS具有最高的交聯(lián)密度,極佳的抗溶脹性和與底膜良好的結(jié)合力;同時,系統(tǒng)考察了不同操作溫度和有機(jī)硫化物含量對PDMS/PVDF膜脫硫性能的影響。滲透汽化實驗結(jié)果表明:一、在45℃,A-PDMS膜的富硫因子最高,達(dá)到3.46;二、M-PDMS膜的滲透通量最高,達(dá)到 21.19 kg/(m2·h)。隨后,將CPO-27-Ni顆粒填充到APTMS交聯(lián)的PDMS基體中,制備出CPO-27-Ni填充的PDMS混合基質(zhì)膜(mixed matrix membranes,MMMs)用于滲透汽化脫硫。采用SEM,X-ray粉末衍射(XRD)和N2吸脫附對CPO-27-Ni粒子進(jìn)行結(jié)構(gòu)表征;通過SEM,XRD,熱重量分析(TGA)和溶脹實驗對膜進(jìn)行綜合表征。隨后,研究了不同CPO-27-Ni粒子填充量對PDMS膜滲透汽化脫硫性能的影響。實驗發(fā)現(xiàn),相比于PDMS膜,MOF/PDMS MMMs的滲透通量和富硫因子均顯著增加。這主要是因為CPO-27-Ni粒子對噻吩的選擇吸附性和其與PDMS膜基質(zhì)的良好兼容性。當(dāng)CPO-27-Ni粒子的填充量為6%時,富硫因子最高達(dá)到4.05,滲透通量為5.92 kg/(m2·h),與純的PDMS膜相比,分別增加了 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，

本文編號：1848580