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首页> 外文期刊>Journal of Applied Polymer Science >PREPARATION OF POLYETHYLENEGLYCOL (PEG) AND CELLULOSE ACETATE (CA) BLEND MEMBRANES AND THEIR GAS PERMEABILITIES
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PREPARATION OF POLYETHYLENEGLYCOL (PEG) AND CELLULOSE ACETATE (CA) BLEND MEMBRANES AND THEIR GAS PERMEABILITIES

机译：聚乙二醇（PEG）和醋酸纤维素（CA）混合膜的制备及其气体渗透性

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Miscible blend membranes containing 10 wt % PEG of low molecular weight 200, 600, 2000, and 6000, and 10 wt %, 20 wt %, 30 wt %, 40 wt %, 50 wt %, and 60 wt % of molecular weight 20,000 were prepared to investigate the effect of PEG on gas permeabilities and selectivities for CO2 over N-2 and CH4. The permeabilities of CO2, H-2, O-2, CH4, and N-2 Were measured at temperatures from 30 to 80 degrees C and pressures from 20 cmHg to 76 cmHg using a manometric permeation apparatus. It was determined that the blend membrane, which contained 10% PEG 20,000, exhibited higher permeability for CO2 and higher permselectivity for CO2 over N-2 and CH4 than those of the membranes that contained 10% PEG of the molecular weight ranging from 200 to 6000. The high PEG 20,000 content blend membranes showed remarkable permeation properties such that the permeability coefficients of CO2 and the ideal separation factors for CO2 over N-2 reached above 200 barrer and 22, respectively, at 70 degrees C and 20 cmHg. Based on the data of gas permeability coefficients, time lags, and characterization of the membranes, it is proposed that the apparent solubility coefficients of all CA and PEG blend membranes for COB were lower than those of the CA membrane. However, almost all of the blend membranes containing PEG 20,000 showed higher apparent diffusivity coefficients for CO2, resulting in higher permeability coefficients of CO2 than those of the CA membrane. It is attributed to the high diffusivity selectivities of CA and PEG 20,000 blend membranes that their ideal separation factors for CO2 over Nz were higher than those of the CA membrane in the temperature range from 50 to 80 degrees C, even though the ideal separation factors of all CA and PEG blend membranes for CO2 over CHI became lower than those of the CA membrane over nearly the full temperature range from 30 to 80 degrees C. (C) 1995 John Wiley & Sons, Inc. [References: 28]
机译：包含低分子量200、600、2000和6000的10 wt％PEG和分子量20,000的10 wt％，20 wt％，30 wt％，40 wt％，50 wt％和60 wt％的可混溶共混膜我们准备研究PEG对N-2和CH4上的气体渗透率和CO2选择性的影响。使用压力渗透仪在30至80摄氏度的温度和20 cmHg至76 cmHg的压力下测量CO2，H-2，O-2，CH4和N-2的渗透率。已确定，与含10％PEG（分子量为200至6000）的膜相比，含10％PEG 20,000的共混膜对N2和CH4的CO2渗透性更高，对CO2的选择性渗透性更高。高PEG 20,000含量的共混膜表现出卓越的渗透性，在70°C和20 cmHg下，N-2上的CO2渗透系数和理想的CO2分离系数分别达到200 barrer和22以上。根据气体渗透系数，时滞和膜表征的数据，提出所有CA和PEG共混膜对COB的表观溶解度系数均低于CA膜。但是，几乎所有含有PEG 20,000的共混膜都表现出较高的CO2扩散系数，导致CO2的渗透系数高于CA膜。归因于CA和PEG 20,000共混膜的高扩散选择性，即使在50到80摄氏度的温度范围内，它们在Nz上对CO2的理想分离系数也比CA膜高。在接近30到80摄氏度的整个温度范围内，CHI上所有用于CO2的CA和PEG混合膜都低于CA膜。（C）1995 John Wiley＆Sons，Inc. [参考：28]

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