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Pervaporative dehydration of organic mixtures using a commercial silica membrane Determination of kinetic parameters

机译：使用商业硅胶膜对有机混合物进行全蒸发脱水测定动力学参数

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摘要

In this work,the performance of a pervaporation commercial silica membrane referenced as PVP (supplied by Pervatech BV,The Netherlands),has been studied.The solvent mixtures used in the experiments were:(i) a synthetic water-isopropanol mixture with 15-20 wt.% inital water content and (ii) an industrial mixture containing about 25 wt.% water-75 wt.% acetone,coming from a reaction process devoted to the manufacture of rubber antioxidants.In both systems the flux of water through the membrane was obtained at different water concentrations in the feed,as dehydration proceeded.The effect of temperature was studied in the range 40-90 deg C.It was found that for the range of conditions investigated,water fluxes through the PVP membrane were larger than those previously reported through the Pervap SMS commercial membrane (supplied by Sulzer Chemtech).Water flux data were fitted to a semi-empirical correlation that expresses water flux as an exponential function of the water activity in the feed mixture,Ln(J_(w,mass)) = (Ln J_(00,w) - E_(act)/RT)+deltaa_w~f.The values of the characteristic mass transfer parameters corresponding to the Pervatech PVP membrane,delta,E_(act) and J_(00,w),were obtained,as required for design purposes.
机译：在这项工作中，已经研究了称为PVP（由荷兰Pervatech BV提供）的全蒸发商业硅胶膜的性能。实验中使用的溶剂混合物为：（i）具有15-初始水分含量为20％（重量），以及（ii）含有约25％（重量）-75％（重量）丙酮的工业混合物，均来自专门用于制造橡胶抗氧化剂的反应过程。随着脱水的进行，在进料中的不同水浓度下获得了膜。研究了温度在40-90摄氏度范围内的影响。发现在所研究的条件范围内，通过PVP膜的水通量大于以前通过Pervap SMS商业膜（由Sulzer Chemtech提供）报告的那些。水通量数据与半经验相关拟合，该关系将水通量表示为fe中水活度的指数函数。 ed混合物，Ln（J_（w，mass））=（Ln J_（00，w）-E_（act）/ RT）+ deltaa_w〜f。对应于Pervatech PVP膜的特征传质参数的值δ根据设计需要，获得了E_（act）和J_（00，w）。

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