用改进的金属膜池法测定二元物系液相扩散系数  

Determination of Liquid Diffusion Coefficients for Binary Systems by Improved Metallic Diaphragm Cell Method

作　　者：陈锦文[1] 张建侯[1] 

机构地区：[1]天津大学化工系

出　　处：《高校化学工程学报》1992年第3期196-201,共6页Journal of Chemical Engineering of Chinese Universities

摘　　要：为进一步缩短液相扩散系数的测定时间,对传统膜池的结构和实验方法作了改进,测定时间缩短为以前金属膜池的一半,仅约1小时。实验测定了苯、乙苯、邻二甲苯、环己烷和环己酮分别与正庚烷所组成的二元物系在25℃的扩散系数,还测定了甲苯+正庚烷物系在20℃、25℃、30℃、35℃的扩散系数以初步考察温度的影响。由实验数据回归得到了各物系微分扩散系数随浓度变化的多项关联式的系数。对上述物系扩散系数的变化规律进行了讨论。In order to further shorten the time, of determination of liquid diffusion coefficient, the tradiational cell structure and experimental procedure are improved, thus to reduce the time of determination to about one half of that for the former metallic diaphragm cell, namely, to about one hour. The diffusion coefficients are measured at 25℃ for each of the systems, composed of benzene, ethyl benzene, o-xylene, cyclohexane or cyclohexanone with n-heptane. The diffusion coefficientes of the system of toluene+n-heptane are also determined at 20℃, 25℃, 30℃, 35℃ to investigate preliminarily the effect of temperature. The coefficients of the polynomial, D_(AB_=sum from j=1 to n A_j V_A^(j-1), which correlates the differential diffusion coefficient with concentration, are determined by regression with experimental data. The effects of different cyclic compounds on diffusion coefficients are investigated and discussed for the above systems.

关 键 词：金属膜池法 液相扩散系数 

分 类 号：TQ021.4[化学工程]