限外ろ過膜分画特性の標準化 : 第6報中空糸ミニ・モジュールのGPCを用いた分画特性の測定

概要

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For the purpose to establish a standard method for determining retention characteristics of hollow fiber ultrafiltration modules, ultrafiltration experiments of aqueous mixed solutions of polyethylene glycoles (PEG) and dextrane (DEX) were carried out using six mini-modules, of which membrane materials were polyethersulfone for two, polysulfone for two and polyacrylonitrile for two modules. The following operating conditions are strongly recommended for this purpose. 1. The effect of concentration polarization should be eliminated with mass transfer coefficients calculated using Lévêques equation, to obtain intrinsic retention R =1-Cp/Cm. 2. With the increase of the operating pressure, molecular cut-off at 90% R decreases and gradient of the molecular cut-off curve of R vs. molecular weight decreases. Therefore, the gradient of the curve should be steap as far as the operating pressure to be allowed enough low. 3. Concentration of each solute will be around 500 mg/l not to be affected by the solute adsorption on the membrane.