Bilayer composite membranes suitable for separating air, consisting of poly(4-methylpentene-1) (PMP) thin film as a selective top layer, an ethylcellulose-heptyIcellulose (ECHC) blend thin film as a selective sublayer, and polysulfone as a porous support, were investigated using a constant pressure-variable volume method. By varying operating temperature, pressure, time, as well as stage cut, the membranes were characterized for their oxygen-enriched air (OEA) flux and oxygen concentration in the OEA permeated in a single step. The results show that both the OEA flux and oxygen concentration through the membranes increase with increasing operating pressure. With the increase of operating temperature, the OEA flux increases largely but the oxygen concentration decreases slightly. The oxygen concentration also decreases slightly with the stage cut. On the contrary, the OEA flux decreases and oxygen concentration increases slightly with operating time. It is found that a PMP thin film plays an important role in enhancing the air-separation capability of the membrane. The PMP/ECHC bilayer thin-film composite membrane could enrich the OEA containing 43.6% oxygen at the OEA flux of 5.06 X 10(-4) cm(3) (STP)/s cm(2) with a good performance stability. (C) 1995 John Wiley and Sons, Inc. [References: 10]
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机译：适用于空气分离的双层复合膜，由作为选择顶层的聚（4-甲基戊烯-1）（PMP）薄膜，作为选择子层的乙基纤维素-庚基纤维素（ECHC）共混薄膜和作为多孔载体的聚砜组成使用恒压可变体积法进行了研究。通过改变操作温度，压力，时间和阶段切割，对膜进行表征，使其膜中的富氧空气（OEA）通量和OEA中的氧浓度可以一步渗透。结果表明，通过膜的OEA通量和氧气浓度均随操作压力的增加而增加。随着工作温度的升高，OEA通量大大增加，但氧浓度略有降低。氧气浓度也随着阶段切割而略微降低。相反，随着工作时间的增加，OEA通量减少而氧气浓度略有增加。发现PMP薄膜在增强膜的空气分离能力中起重要作用。 PMP / ECHC双层薄膜复合膜可以在5.06 X 10（-4）cm（3）（STP）/ s cm（2）的OEA通量下富集含43.6％氧的OEA。 （C）1995 John Wiley and Sons，Inc. [参考：10]
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