动态法制备内皮层中空纤维优先透醇渗透汽化复合膜的研究
发布时间：2018-10-08 18:56
【摘要】： 在能源危机的冲击下,世界各国都在加速新能源的开发和利用,燃料乙醇作为一种高效,清洁的可再生能源得到广泛关注。随着膜分离技术的发展,渗透汽化法作为一种高效、节能膜分离技术受到广泛的关注。而优先透醇渗透汽化膜被认为是未来制取燃料乙醇的关键技术之一。目前对于优先透醇膜的研究仍然以板式膜为主,但是中空纤维渗透汽化膜组件具有装填密度高、自支撑结构,成本低等优势,具有较大的潜在应用价值。 鉴于此,本文以聚砜超滤膜为基膜,通过动态加压复合聚二甲基硅氧烷(PDMS)试制内皮层式中空纤维PDMS/PS优先透醇渗透汽化膜。实验首先对不同成膜方式下的渗透汽化透醇性能进行比较,得出倒向动态复合法可以获得较好的分离效果。在此基础上,考察了动态过滤时间,PDMS聚合物浓度,交联剂TEOS浓度等因素对PDMS/PS复合膜的渗透汽化透醇性能的影响。得出制备的适宜条件为：动态过滤时间60min；聚合物PDMS浓度22.8wt%；交联剂TEOS浓度1.5wt%。对复合前后中空纤维膜的内表面进行电镜,原子力显微镜,接触角的分析表征,证实了致密分离层的形成。在50℃时,该复合膜对8wt.%乙醇／水体系的分离因子可达6.4,渗透通量约265 g/m2.h。进一步测定了复合膜对不同醇／水体系渗透汽化透醇性能,发现在相同的复合条件下,该复合膜对异丙醇／水体系的分离因子可达10.1,渗透通量为(50℃)。 本文还进一步在PDMS溶液中加入改性后的沸石分子筛,动态加压法制备了内皮层中空纤维PDMS-Silicalite/PS优先透醇渗透汽化膜。实验考察了分子筛添加量,超声时间等因素对PDMS-Silicalite/PS复合膜的渗透汽化透醇性能的影响。得出在硅铝比为500条件下,超声10h,分子筛添加量为0.15wt.%,时对8wt.%的乙醇／水体系分离因子能达到10.0,渗透通量为1076g/m2.h。实验还比较了不同硅铝比对PDMS-Silicalite/PS复合膜的渗透汽化透醇性能的影响,得出：硅铝比越高,渗透汽化分离性能越好。对分子筛改性前后进行红外光谱等的表征证实了改性后分子筛分子结构的变化,对复合前后中空纤维膜的内表面进行电镜,原子力显微镜,接触角的分析,证实了疏水致密杂化分离层的形成。
[Abstract]:Under the impact of energy crisis, every country in the world is speeding up the development and utilization of new energy. Fuel ethanol, as a kind of efficient and clean renewable energy, has received extensive attention. With the development of membrane separation technology, pervaporation as a kind of high efficiency and energy-saving membrane separation technology has received extensive attention. The preferential pervaporation membrane is considered as one of the key technologies for the preparation of fuel ethanol in the future. At present, the research on preferential permeable alcohol membrane is still focused on the plate membrane, but the hollow fiber pervaporation membrane module has the advantages of high filling density, self-supporting structure and low cost, so it has great potential application value. In view of this, the endothelial layer hollow fiber PDMS/PS was preferentially permeated into alcohol pervaporation membrane by using polysulfone ultrafiltration membrane as the base membrane and dynamic pressure composite polydimethylsiloxane (PDMS). In this experiment, the pervaporation of alcohol pervaporation under different membrane formation methods was compared, and it was concluded that the reverse dynamic composite method could obtain a better separation effect. On this basis, the effects of dynamic filtration time, polymer concentration and crosslinking agent TEOS concentration on the pervaporation and alcohol permeability of PDMS/PS composite membrane were investigated. The optimum conditions were obtained as follows: the dynamic filtration time was 60 min, the concentration of polymer PDMS was 22.8wt, the concentration of crosslinking agent TEOS was 1.5wt. The formation of dense separation layer was confirmed by electron microscope atomic force microscope and contact angle analysis on the inner surface of hollow fiber membrane before and after composite. At 50 鈩，
本文编号：2257902
[Abstract]:Under the impact of energy crisis, every country in the world is speeding up the development and utilization of new energy. Fuel ethanol, as a kind of efficient and clean renewable energy, has received extensive attention. With the development of membrane separation technology, pervaporation as a kind of high efficiency and energy-saving membrane separation technology has received extensive attention. The preferential pervaporation membrane is considered as one of the key technologies for the preparation of fuel ethanol in the future. At present, the research on preferential permeable alcohol membrane is still focused on the plate membrane, but the hollow fiber pervaporation membrane module has the advantages of high filling density, self-supporting structure and low cost, so it has great potential application value. In view of this, the endothelial layer hollow fiber PDMS/PS was preferentially permeated into alcohol pervaporation membrane by using polysulfone ultrafiltration membrane as the base membrane and dynamic pressure composite polydimethylsiloxane (PDMS). In this experiment, the pervaporation of alcohol pervaporation under different membrane formation methods was compared, and it was concluded that the reverse dynamic composite method could obtain a better separation effect. On this basis, the effects of dynamic filtration time, polymer concentration and crosslinking agent TEOS concentration on the pervaporation and alcohol permeability of PDMS/PS composite membrane were investigated. The optimum conditions were obtained as follows: the dynamic filtration time was 60 min, the concentration of polymer PDMS was 22.8wt, the concentration of crosslinking agent TEOS was 1.5wt. The formation of dense separation layer was confirmed by electron microscope atomic force microscope and contact angle analysis on the inner surface of hollow fiber membrane before and after composite. At 50 鈩，
本文编号：2257902
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