PEBA2533/PEG600/CuNaY混合基质膜的制备及对C_(3)H_(6)/C_(2)H_(4)混合气的分离性能  

Preparation of PEBA2533/PEG600/CuNaY Mixed Matrix Membranes and Separation Performance for C_(3)H_(6)/C_(2)H_(4) Mixture

作　　者：张茜[1] 王晓东[1] 黄伟[1] ZHANG Xi;WANG Xiaodong;HUANG Wei(State Key Laboratory of Clean and Efficient Coal Utilization,Taiyuan University of Technology,Taiyuan 030024,China)

机构地区：[1]太原理工大学省部共建煤基能源清洁高效利用国家重点实验室,山西太原030024

出　　处：《石油学报（石油加工）》2023年第4期727-736,共10页Acta Petrolei Sinica(Petroleum Processing Section)

基　　金：国家重点研发计划项目(2020YFB0606405);山西省基础研究计划项目(20210302123197);山西省重点研发计划项目(201803D121043);2014年度山西省煤基重点科技攻关项目(MH2014-10)基金资助。

摘　　要：以聚醚嵌段共聚酰胺(PEBA2533)和聚乙二醇(PEG600)共混物为有机基质、自制CuNaY分子筛为添加剂,利用溶液浇注法制备了PEBA2533/PEG600/CuNaY混合基质膜。采用扫描电子显微镜(SEM)、电感耦合等离子体发射光谱(ICP-OES)、衰减全反射傅里叶红外光谱(ATR-FTIR)及差示扫描量热(DSC)等分析方法对PEBA2533/PEG600/CuNaY混合基质膜进行表征,考察了CuNaY分子筛中Cu^(2+)交换度和含量对混合基质膜微结构和C_(3)H_(6)/C_(2)H_(4)混合气(摩尔比50/50)分离效果的影响。结果表明:CuNaY与PEBA2533/PEG600发生物理混合,并使有机基质链的移动性增强;CuNaY分子筛在混合基质膜中质量分数不大于6%时,其分布均一,与有机基质结合良好;极化能力更强的Cu^(2+)取代Na^(+)提高了混合基质膜的分离性能,Cu^(2+)交换度对C_(3)H_(6)选择性存在最佳值,低温有利于提高C_(3)H_(6)/C_(2)H_(4)选择性。在温度-35℃、压力0.2 MPa的条件下,添加CuNaY分子筛质量分数6%、Cu^(2+)交换度12.90%时制备的混合基质膜对C_(3)H_(6)/C_(2)H_(4)混合气的分离性能最佳,C_(3)H_(6)/C_(2)H_(4)选择性可达10.5,C_(3)H_(6)渗透系数为350 barrer。PEBA2533/PEG600/CuNaY mixed matrix membranes were prepared by solution casting method,using polyether block copolyamide(PEBA2533)and polyethylene glycol(PEG600)blend as organic matrix,and self-made CuNaY zeolite as additives.PEBA2533/PEG600/CuNaY MMMs were characterized by scanning electron microscope(SEM),inductively coupled plasma optical emission spectrometer(ICP-OES),attenuated total reflectance Fourier transform infrared(ATR-FTIR)and differential scanning calorimetry(DSC)analysis to investigate the effect of Cu^(2+)exchange degree and content in CuNaY zeolite on the microstructure of membranes and the separation performance of C_(3)H_(6)/C_(2)H_(4) mixture.The results show that physical mixing occurs between CuNaY and PEBA2533/PEG600,and thus the mobility of organic matrix chain is enhanced;CuNaY zeolite distributes homogeneously in the mixed matrix membranes when its mass fraction is not greater than 6%,and combines well with organic matrix;Cu^(2+)with stronger polarizability has improved the separation performance of the mixed matrix membranes by replacing Na^(+).Cu^(2+)exchange degree has the best value for C_(3)H_(6) selectivity,and lower temperature can help improve C_(3)H_(6)/C_(2)H_(4) selectivity.At temperature of-35℃and pressure of 0.2 MPa,a mass fraction of 6%for CuNaY zeolite and the Cu^(2+)exchange degree of 12.90%,the prepared mixed matrix membran has the best separation performance for C_(3)H_(6)/C_(2)H_(4) mixture and the C_(3)H_(6)/C_(2)H_(4) selectivity on this membrane is up to 10.5,with the C_(3)H_(6) permeability of 350 barrer.

关 键 词：PEBA2533/PEG600/CuNaY混合基质膜 C_(3)H_(6)/C_(2)H_(4)混合气 交换度 分离 渗透系数 

分 类 号：O614[理学—无机化学]