摘要
针对渗透汽化分离二甲基甲酰胺(DMF)和二甲基乙酰胺(DMAc)酰胺类溶剂过程中渗透性和选择性之间此升彼降的矛盾关系(trade-off 效应),提出界面聚合薄层 PI 复合膜的方法。通过均苯四甲酸酐和五氯化磷制备有机相单体均苯四甲酰氯,分别以间苯二胺(MPDA)、丙二胺(DAPE)及己二胺(HMD)为水相单体,采用界面聚合法制备 3 种耐溶剂型聚酰亚胺(PI)复合膜,并对 3 种 PI 复合膜进行表征和渗透汽化分离性能测试。结果表明:3 种 PI 复合膜都具有良好的亲水性、热稳定性;在 6 种常见的有机溶剂中,保持良好的稳定性;在 30~60 ℃条件下,HMD-PI 膜对质量分数 90%DMF/H2O体系和质量分数 90% DMAc/H2O体系的分离因子最高可达 12.7和 36.8,渗透通量可达 1 014和 542 g m 2 h 1,具有较好的分离效果。
During pervaporation separation of dimethylformamide (DMF)/water and dimethylacetamide (DMAc)/water systems, a trade-off effect between permeability and selectivity always happens. A method for the synthesis of thin PI composite membranes by interfacial polymerization was proposed for solving this problem. Organic phase monomer pyromellitic chloride (BTAC) was prepared by pyromellitic anhydride and phosphorus pentachloride. Solvent-resistant polyimide (PI) composite membranes were made by interfacial polymerization, where m-phenylenediamine (MPDA), propylenediamine (DAPE) and hexamethylenediamine (HMD) were used as aqueous phase monomers. The PI composite membranes and their pervaporation performance were characterized. All of the three composite membranes had good hydrophilicity and excellent thermal stability. The PI composite membranes presented excellent stabilities after immersing in common organic solvents. When using the HMD-PI membrane to separate solvent/water (90/10 %) from 30 ℃ to 60 ℃, the best separation factor can reach 12.7 and 35.8 for DMF/water and DMAc/water systems respectively, and the flux reaches 1 014 and 542 g?m?2?h?1 for DMF/water and DMAc/water systems, respectively. These results indicate that the HMD-PI membrane presents excellent separation performance for solvent/water systems.
作者
蒋超
马文中
李太雨
徐荣
张琪
钟璟
JIANG Chao;MA Wen-zhong;LI Tai-yu;XU Rong;ZHONG Qi;ZHONG Jing(Jiangsu Key Laboratory of Advanced Catalytic Materials and Technology,School of Petrochemical Engineering, Changzhou University, Changzhou 213164, China;Jiangsu Key Laboratory of Environmentally Friendly Polymeric Materials,School of Materials Science and Engineering, Changzhou University, Changzhou 213164, China)
出处
《高校化学工程学报》
EI
CAS
CSCD
北大核心
2019年第3期724-731,共8页
Journal of Chemical Engineering of Chinese Universities
基金
中国石油化工股份有限公司科技项目(216078)
江苏省先进催化与绿色制造协同创新中心(常州大学)
江苏省高等学校自然科学研究项目资助(18KJA430005,18KJA530001)
江苏省研究生培养创新工程项目(KYCX18_2614)
关键词
界面聚合
聚酰亚胺膜
渗透汽化
耐溶剂型
interfacial polymerization
polyimide membrane
pervaporation
solvent-resistance
