CAJ | 학술논문

为了提高CO2分离膜的性能，将接枝了氨基的MCM-41分子筛（MCM-NH2）添加到聚乙烯基胺（PVAm）水溶液中配制涂膜液，并将PVAm-MCM-NH2涂膜液涂覆到聚砜（PSf）超滤膜上制备PVAm-MCM-NH2/PSf混合基质复合膜。复合膜分离层较薄，有利于CO2渗透速率的提高。接枝的胺基提高了分子筛与聚合物的相容性和膜内胺基含量，有利于膜渗透选择性能的提高。使用CO2/N2混合气（15% CO2+85% N2，体积分数）考察了不同MCM-NH2添加量的PVAm-MCM-NH2/PSf膜的渗透选择性能。当涂膜液中mMCM-NH2/mPVAm为0.2、湿涂层厚度为50μm，测试温度为22℃、进料气压力为0.11 MPa时，膜的CO2渗透速率可达4.66×10?7 mol·m?2·s?1·Pa?1， CO2/N2分离因子可达150。较高的CO2/N2分离性能表明PVAm-MCM-NH2/PSf膜在烟道气碳捕集领域具有良好的应用前景。此外，考察了湿涂层厚度、热处理、添加小分子胺等条件对膜渗透选择性能的影响。
위료제고CO2분리막적성능，장접지료안기적MCM-41분자사（MCM-NH2）첨가도취을희기알（PVAm）수용액중배제도막액，병장PVAm-MCM-NH2도막액도복도취풍（PSf）초려막상제비PVAm-MCM-NH2/PSf혼합기질복합막。복합막분리층교박，유리우CO2삼투속솔적제고。접지적알기제고료분자사여취합물적상용성화막내알기함량，유리우막삼투선택성능적제고。사용CO2/N2혼합기（15% CO2+85% N2，체적분수）고찰료불동MCM-NH2첨가량적PVAm-MCM-NH2/PSf막적삼투선택성능。당도막액중mMCM-NH2/mPVAm위0.2、습도층후도위50μm，측시온도위22℃、진료기압력위0.11 MPa시，막적CO2삼투속솔가체4.66×10?7 mol·m?2·s?1·Pa?1， CO2/N2분리인자가체150。교고적CO2/N2분리성능표명PVAm-MCM-NH2/PSf막재연도기탄포집영역구유량호적응용전경。차외，고찰료습도층후도、열처리、첨가소분자알등조건대막삼투선택성능적영향。
To improve the performance of CO2 separation membrane, MCM-41 modified by amines (MCM-NH2) was filled into polyvinylamine (PVAm) aqueous solution to fabricate PVAm-MCM-NH2 coating solutions. PVAm-MCM-NH2/polysulfone (PSf) mixed matrix composite membranes were prepared by coating PVAm-MCM-NH2 solutions on PSf ultrafiltration membranes. The separation layer of the composite membrane was very thin, which benefited the improvement of CO2 permeance. The amine groups grafted to MCM-41 facilitated the transport of CO2 through reversible reaction and simultaneously improved the filler-polymer interface compatibility. The separation performance of PVAm-MCM-NH2/PSf membranes with different MCM-NH2 content was tested using CO2/N2 mixed gas (15% (vol) CO2 + 85%(vol) N2). WhenmMCM-NH2/mPVAm in the coating solution was 0.2 at testing temperature of 22℃ and feed gas pressure of 0.11 MPa, the composite <br> membrane exhibited a CO2 permeance of 4.66×10?7 mol·m?2·s?1·Pa?1 and a CO2/N2 selectivity of 150. The high-performance PVAm-MCM-NH2/PSf membrane showed promising applications in CO2 capture from flue gas. Moreover, the effects of the wet coating thickness, the heat treatment and the introduction of the small molecule amines on the separation performance of PVAm-MCM-NH2/PSf membrane were investigated. The results indicated that the increase of wet coating thickness (from 50μm to 100μm) with heat treatment under 80℃ or the introduction of ethanediamine would lead to the improvement of the pressure stability, but the loss of CO2/N2 separation performance under low pressures.