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首页> 外文期刊>Separation and Purification Technology >Performance of PEI/BMI semi-IPN membranes for separations of various binary gaseous mixtures
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Performance of PEI/BMI semi-IPN membranes for separations of various binary gaseous mixtures

机译：PEI / BMI半IPN膜对各种二元气体混合物的分离性能

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摘要

Synthesis of polyetherimide-bismaleimide (PEI-BMI) semi-interpenetrating polymer networks (semi-IPNs) combined with solvent phase inversion was used to prepare asymmetric flat membranes,which were coated with silicon rubber.These membranes were evaluated for production of O2-enriched air and separation of CO2 from its mixture with CH4 as well as with N2.Using different preparation schemes membranes with varying skin and supported layer characteristics were prepared.These different morphologies of membranes were responsible for a trade-off performance between gas permeance and permselectivity.These new composite,PEI-BMI semi-IPN membranes showed suitable performance for production of O2-enriched air and separation of CO2 from natural gas or flue gas relevant to greenhouse gas emission control.Membrane performance was explained in terms of the intrinsic gas transport properties of the coated silicon layer and membrane glassy material,which determine the limitations of permeance-permselectivity trade-off.It was also found that the permselectivity for CO2 over CH4 or N2 increases with increasing CO2 feed concentration.This might be exploited to arrange for more cost-efficient multistage gas separation systems.
机译：合成聚醚酰亚胺-双马来酰亚胺（PEI-BMI）半互穿聚合物网络（semi-IPNs）并结合溶剂相转化制备不对称的平膜，该膜上涂有硅橡胶，并评价了这些膜的生产富O 2的能力。空气和从其与CH4和N2的混合物中分离出CO2。使用不同的制备方案，制备了具有不同表皮和支撑层特性的膜，这些不同的膜形态决定了气体渗透率和渗透选择性之间的权衡性能。这些新型的复合PEI-BMI半IPN膜在生产富含O2的空气以及从天然气或烟道气中分离与温室气体排放控制相关的CO2方面表现出合适的性能。根据固有的气体传输特性解释了膜的性能涂层硅层和膜状玻璃质材料的特性决定了渗透磁导率的局限性我们还发现，随着CH2或N2的进料浓度增加，CO2对CH2的渗透选择性也随之增加，这可能会被用于安排更具成本效益的多级气体分离系统。

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