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在含 6块塔板的板式塔中选择 2个非理想性较大的二元物系进行全回流蒸馏传质实验 ,同时从描述多组分扩散过程的普遍化方程———Maxwell-Stefan(MS)方程出发建立一个求算传质系数的数学模型 .数据处理和计算的结果表明 ,传质系数不仅与该塔板的浓度有关 ,还与相邻塔板的浓度有关 .对于非理想程度大的醇水物系 ,在不同浓度下的传质系数最大值与最小值相差可达约 1个数量级 .因此 ,对于非理想物系 ,在设计计算中将传质系数当作常数的处理将会产生较大误差 .
In the plate column with 6 trays, two non-ideal binary systems were selected for full-reflux distillation mass transfer experiments. From the generalized equation describing the multicomponent diffusion process --- Maxwell-Stefan ( MS), a mathematical model for calculating the mass transfer coefficient was established.The results of data processing and calculation showed that the mass transfer coefficient was related not only to the concentration of the plate but also to the concentration of the adjacent plate, and for the non-ideal large , The difference between the maximum and minimum values of mass transfer coefficients at different concentrations can be up to about one order of magnitude.Thus, for non-ideal systems, treating the mass transfer coefficient as a constant in design calculations will Have a greater error.