离子液体支撑液膜的制备及气体分离性能的研究
发布时间：2018-08-27 14:57
【摘要】：随着工业化快速的发展,能源消耗的持续增长,以煤和石油为主的能源在燃烧过程中排放出大量的二氧化碳、二氧化硫、氮氧化物等造成了环境污染。对污染性气体进行分离与纯化是治理气体污染的重要途径。膜分离具有高效、节能、环保的优点,它基于膜材料的选择性来实现对不同组分的分离、提纯,已被广泛应用于化工、冶金、能源等领域。近年来,特别是随着气体分离膜、渗透气化膜的相继出现,为气体分离工艺开辟了新的途径。本文研究了离子液体支撑液膜分离混合气体。分别以PVDF和PSF为基膜,用非溶剂致相分离法制备聚合物微孔膜。利用分子模拟计算[BMIM][CH3CH2COO]、[BMIM][CH3COO]、[BMIM][SCN]、[BMIM][CF3CO O]、[BMIM][CH3C6H4SO3]等离子液体与气体分子形成配位化合物的最优构型和配位化合物的最低配位能,来预测离子液体的气体选择性。合成上述的离子液体,并制备出离子液体支撑液膜,测定在一定的进气压力下不同温度时支撑液膜对N2、H2、CO2等气体的渗透速率及支撑液膜对CO2/N2、CO2/H2、N2/H2的分离效率。实验结果表明:PVDF型离子液体支撑液膜对气体的渗透系数P维持在10-10[m3(STP)·m/m2·s·atm]数量级,PVDF-[BMIM][CH3C6H4SO3]支撑液膜对CO2/N2分离因子在30℃达到最高为10.86,对CO2/H2分离因子30℃达到最高为7.12,低温环境有利于PVDF型离子液体支撑液膜的气体分离;而PSF离子液体支撑液膜的气体渗透系数维持在10-9[m3(STP)·m/m2·s·atm]数量级,PSF-[BMIM][C3H8O2]支撑液膜对N2/CO2分离因子在50℃时达到最大值为4.17。
[Abstract]:With the rapid development of industrialization and the continuous increase of energy consumption, coal and petroleum energy sources emit a lot of carbon dioxide, sulfur dioxide and nitrogen oxides in the process of combustion, resulting in environmental pollution. The separation and purification of polluting gases is an important way to control gas pollution. Membrane separation has the advantages of high efficiency, energy saving and environmental protection. It is based on the selectivity of membrane materials to achieve the separation and purification of different components. It has been widely used in chemical, metallurgical, energy and other fields. In recent years, especially with the gas separation membrane, permeable gasification membrane appeared one after another, which opened up a new way for gas separation process. The separation of mixed gases by ionic liquid supported liquid membrane has been studied in this paper. Polymer microporous membranes were prepared by non-solvent phase separation using PVDF and PSF as base membranes respectively. The optimum configuration of [BMIM] [CH3CH2COO], [BMIM] [CH3COO], [BMIM] [SCN], [BMIM] [CF3CO O], [BMIM] [CH3C6H4SO3] plasma liquids to form coordination compounds with gas molecules were calculated by molecular simulation to predict the gas selectivity of ionic liquids. The above ionic liquids were synthesized and the ionic liquid supported liquid membranes were prepared. The permeation rate of the supported liquid membranes to the gases such as N _ 2H _ 2O _ 2 and the separation efficiency of the supported liquid membranes for CO2/N2,CO2/H2,N2/H2 were measured at different temperatures under a certain inlet pressure. The experimental results show that the permeation coefficient of the support liquid membrane P to the gas is 10-10 [m3 (STP) m/m2 s atm] order of magnitude. The maximum separation factor for CO2/N2 is 10.86 at 30 鈩，
本文编号：2207628
[Abstract]:With the rapid development of industrialization and the continuous increase of energy consumption, coal and petroleum energy sources emit a lot of carbon dioxide, sulfur dioxide and nitrogen oxides in the process of combustion, resulting in environmental pollution. The separation and purification of polluting gases is an important way to control gas pollution. Membrane separation has the advantages of high efficiency, energy saving and environmental protection. It is based on the selectivity of membrane materials to achieve the separation and purification of different components. It has been widely used in chemical, metallurgical, energy and other fields. In recent years, especially with the gas separation membrane, permeable gasification membrane appeared one after another, which opened up a new way for gas separation process. The separation of mixed gases by ionic liquid supported liquid membrane has been studied in this paper. Polymer microporous membranes were prepared by non-solvent phase separation using PVDF and PSF as base membranes respectively. The optimum configuration of [BMIM] [CH3CH2COO], [BMIM] [CH3COO], [BMIM] [SCN], [BMIM] [CF3CO O], [BMIM] [CH3C6H4SO3] plasma liquids to form coordination compounds with gas molecules were calculated by molecular simulation to predict the gas selectivity of ionic liquids. The above ionic liquids were synthesized and the ionic liquid supported liquid membranes were prepared. The permeation rate of the supported liquid membranes to the gases such as N _ 2H _ 2O _ 2 and the separation efficiency of the supported liquid membranes for CO2/N2,CO2/H2,N2/H2 were measured at different temperatures under a certain inlet pressure. The experimental results show that the permeation coefficient of the support liquid membrane P to the gas is 10-10 [m3 (STP) m/m2 s atm] order of magnitude. The maximum separation factor for CO2/N2 is 10.86 at 30 鈩，
本文编号：2207628
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