摘要
将湿壁塔中得到的反应精馏汽液传质数据用于反应精馏的传质计算。理论计算值与实验值一致性较好。这说明：反应精馏过程如果按等摩尔扩散考虑，误差较大，在要求较严的计算时，应按非等摩尔扩散考虑；对非理想性较强的物系，采用具有交叉系数的液相扩散系数矩阵，所得结果误差更小。
Experimental measurements for reactive distillation of the reactive system H2O EtOH HAck-EtOAc have been carried out in a wetted wall column with a 0.044 m internal diameter and a test section of height 0.5 m. The vapor and the liquid compositions entering and leaving the column, together with the corresponding temperatures, were measured for different conditions. For measured conditions at the bottom of the wetted column, the compositions and temperatures at the top of the column predicted by the six models obtained are compared with the experimentally determined values. It is seen that good agreements were obtained in the comparison, and the commonly made assumption of equimolar transfer during reactive distillation may lead to significant errors in the calculation of constituent species transfer. Therefore,non-equimolar mass transfer models should be used if more accurate calculations are required.The diffusional interactions are present to a significant extent for the non ideal system. The mass transfer behavior is better predicted by multicomponent mass transfer models utilizing matrices of mass transfer coefficients including off-diagonal elements than those using effective diffusion coefficients.
出处
《天津大学学报》
EI
CAS
CSCD
1994年第1期28-34,共7页
Journal of Tianjin University(Science and Technology)
基金
国家教育委员会资助
关键词
反应精馏
湿壁塔
传质模型
mass transfer with reaction
reactive distillation
wetted wall column
mass transfer model
