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首页> 外文期刊>Journal of industrial and engineering chemistry >Role of critical concentration of PEI in NMP solutions on gas permeation characteristics of PEI gas separation membranes
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Role of critical concentration of PEI in NMP solutions on gas permeation characteristics of PEI gas separation membranes

机译：NMP溶液中PEI的临界浓度对PEI气体分离膜的气体渗透特性的影响

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摘要

In preparation of polymeric gas separation membranes by phase inversion method, polymer concentration is one of the most important variables which can change membrane morphology and behavior. In this research, critical concentration of the polyetherimide (PEI) solutions in N-methyl-2-pyrrolidone (NMP) as a solvent was determined by viscometric method. The influence of temperature on critical concentration was studied. Three asymmetric PDMS/PEI membranes with different concentrations of PEI were prepared and characterized for H2/CH4 separation. The results showed that the membranes with higher concentrations than critical concentration were more suitable for gas separation. In addition, the viscosity data were fitted by appropriate equations and the densities were satisfactorily correlated by a simple first-order polynomial with respect to temperature and the PEI mass fraction. The prepared membrane showed the selectivity of 26 for H2/CH4 separation at 1 bar and 25 °C for pure gas and 24.8 for mixed gas. The influence of the pressure on the H2 and CH4 permeance and the selectivity for a mixed binary gas showed that the permeance of both gases declined by pressure enhancement and the selectivity increased.
机译：在通过相转化法制备聚合物气体分离膜中，聚合物浓度是最重要的变量之一，可以改变膜的形态和行为。在这项研究中，通过粘度测定法确定了在N-甲基-2-吡咯烷酮（NMP）中作为溶剂的聚醚酰亚胺（PEI）溶液的临界浓度。研究了温度对临界浓度的影响。制备了三种具有不同PEI浓度的不对称PDMS / PEI膜，并进行了H2 / CH4分离的表征。结果表明，浓度高于临界浓度的膜更适合于气体分离。另外，通过合适的方程式拟合粘度数据，并且通过关于温度和PEI质量分数的简单的一阶多项式使密度令人满意地相关。制备的膜在1 bar和25°C下对H2 / CH4分离的纯气体选择性为26，对混合气体的选择性为24.8。压力对H2和CH4渗透率以及混合二元气体选择性的影响表明，两种气体的渗透率均会因压力升高而降低，而选择性则有所提高。

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