Separation performance of polyimide composite membrane prepared by dip coating process
Separation performance of polyimide composite membrane prepared by dip coating process
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DOI：
10.1016/s0376-7388(01)00337-4
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发表时间：
2001-07
影响因子：
9.5
通讯作者：
H. Yanagishita;D. Kitamoto;K. Haraya;T. Nakane;T. Okada;H. Matsuda;Y. Idemoto;N. Koura
中科院分区：
文献类型：
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作者：
H. Yanagishita;D. Kitamoto;K. Haraya;T. Nakane;T. Okada;H. Matsuda;Y. Idemoto;N. Koura
研究了浸渍法制备聚酰亚胺复合膜的工艺条件对膜性能的影响。以均苯四甲酸二酐（PMDA）和4，4 ′-二氨基二苯醚（ODA）为原料合成聚酰亚胺（PI）前驱体，再与三乙胺混合，制得聚酰胺酸三乙胺盐（PAA盐）。将作为支撑膜的不对称聚酰亚胺膜（PI-2080）浸入PAA盐（浓度0 - 5wt. %）中，甲醇溶液。PAA盐的涂层通过在普通真空烘箱中在200 ° C下退火3小时而转化为聚酰亚胺的涂层。通过气体渗透（N2，O2，CO2，在1kg/cm 2下）和渗透汽化（进料：95vol. %）评价聚酰亚胺复合膜的性能。乙醇水溶液，30 - 60 ° C）。使用5wt. %的涂层溶液制备的复合膜。PAA盐的CO2/N2气体渗透选择性大于25，渗透汽化分离因子α（H2O/EtOH）大于800，总通量为0.21kg/m2h。
The effects of the preparation conditions in a dip coating process on polyimide composite membranes have been investigated. Polyimide precursor obtained from pyromellitic dianhidride (PMDA) and 4,4′-oxydianiline (ODA) was mixed with triethylamine and poly(amic acid)tri-ethylamine salt (PAA salt) was made. An asymmetric polyimide membrane (PI-2080) as a supporting membrane was dipped in a PAA salt (concentration 0–5wt.%) methanol solution. The coating layers of PAA salt were converted to these of polyimide by annealing at 200°C for 3h in an ordinary vacuum oven. The performance of the polyimide composite membrane was evaluated by gas permeation (N2, O2, CO2, at 1kg/cm2) and pervaporation (feed: a 95vol.% ethanol aqueous solution at 30–60°C). The composite membranes prepared using a coating solution of 5wt.% PAA salt showed the CO2/N2selectivity of over 25 on gas permeation, and separation factor α (H2O/EtOH) of over 800 with a total flux of 0.21kg/m2h on pervaporation.