高校化学工程学报
高校化學工程學報
고교화학공정학보
JOURNAL OF CHEMICAL ENGINEERING OF CHINESE UNIVERSITIES
2009年
6期
1030-1037
,共8页
聚酰胺%聚乙烯醇%界面缩聚%膜%交替复合%渗透汽化
聚酰胺%聚乙烯醇%界麵縮聚%膜%交替複閤%滲透汽化
취선알%취을희순%계면축취%막%교체복합%삼투기화
polyamide%polyvinyl alcohol%interfacial polycondensation%membrane
以工业应用的反渗透(RO)聚酰胺(PA)复合膜为支撑膜,通过组合浸涂法和界面缩聚(IP)法的两步成膜工艺,制备了分离层为交替复合的聚酰胺/聚乙烯醇/聚酰胺(PA/PVA/PA)多层复合膜(MLCM).用扫描电子显微镜(SEM)和原子力显微镜(AFM)分析了PA/PVA/PA MLCM的结构特征.结果表明,浸涂和IP的工艺条件是影响MLCM的分离性能以及微结构的主要因素.优化工艺制成的PA/PVA/PA MLCM,在实验温度20℃和下游真空度小于1000 Pa时,渗透汽化(PV)分离异丙醇(IPA)浓度为87.8%的水混合物,渗透通量(J)为60～80 g·m~(-2)·h~(-1),渗透物中水含量(CC_(p-H_2O))达99%以上.不同材料制成的多层交替复合的分离层具有显著的微结构形态和独特的双重选择性分离功能,其纳米-亚微米级厚度的多层结构强化了复合膜的水渗透性.
以工業應用的反滲透(RO)聚酰胺(PA)複閤膜為支撐膜,通過組閤浸塗法和界麵縮聚(IP)法的兩步成膜工藝,製備瞭分離層為交替複閤的聚酰胺/聚乙烯醇/聚酰胺(PA/PVA/PA)多層複閤膜(MLCM).用掃描電子顯微鏡(SEM)和原子力顯微鏡(AFM)分析瞭PA/PVA/PA MLCM的結構特徵.結果錶明,浸塗和IP的工藝條件是影響MLCM的分離性能以及微結構的主要因素.優化工藝製成的PA/PVA/PA MLCM,在實驗溫度20℃和下遊真空度小于1000 Pa時,滲透汽化(PV)分離異丙醇(IPA)濃度為87.8%的水混閤物,滲透通量(J)為60～80 g·m~(-2)·h~(-1),滲透物中水含量(CC_(p-H_2O))達99%以上.不同材料製成的多層交替複閤的分離層具有顯著的微結構形態和獨特的雙重選擇性分離功能,其納米-亞微米級厚度的多層結構彊化瞭複閤膜的水滲透性.
이공업응용적반삼투(RO)취선알(PA)복합막위지탱막,통과조합침도법화계면축취(IP)법적량보성막공예,제비료분리층위교체복합적취선알/취을희순/취선알(PA/PVA/PA)다층복합막(MLCM).용소묘전자현미경(SEM)화원자력현미경(AFM)분석료PA/PVA/PA MLCM적결구특정.결과표명,침도화IP적공예조건시영향MLCM적분리성능이급미결구적주요인소.우화공예제성적PA/PVA/PA MLCM,재실험온도20℃화하유진공도소우1000 Pa시,삼투기화(PV)분리이병순(IPA)농도위87.8%적수혼합물,삼투통량(J)위60～80 g·m~(-2)·h~(-1),삼투물중수함량(CC_(p-H_2O))체99%이상.불동재료제성적다층교체복합적분리층구유현저적미결구형태화독특적쌍중선택성분리공능,기납미-아미미급후도적다층결구강화료복합막적수삼투성.
With the large-scale industrially manufactured polyamide (PA) as the support layer, PA/PVA/PA, the multilayer composite membrane (MLCM) with alternate separation layers was prepared by two preparation process in succession, dip-coating technique and interfacial polycondensation (IP). The microstructure characteristic of the prepared PA/PVA/PA MLCM was explored through the micrographs of scanning electron microscope (SEM) and atom force microscope (AFM). The results show that the technical conditions of the dip-coating process and IP are the critical factors affecting the separation performance and the microstructure characteristic of the prepared PA/PVA/PA MLCM. When using the PA/PVA/PA MLCM prepared under its optimized preparation conditions to separate the isoproponol alcohol (IPA)/water mixture with concentration of 87.8% by pervaporation (PV) at 20℃ and vacuum＜1000 Pa, the permeate flux (J) of 60～80 g·m~(-2)·h~(-1) and the water concentration in the permeate (C_(p-H_2O)) of more than 99% can be achieved. The results show that the multiple separation layer formed by different materials alternately has obvious morphology of microstructure and distinct double-selectivity, and its multiplayer structure with a thickness of nano-submicron level enhances its water permeability.
