Abstract:

The wiper can enhance mass transfer efficiency of molecular distillation device. Based on the structural relationship between feed flow rate, liquid concentration, motor speed, evaporator size and other factors, a mathematical model of wiped film molecular distillation was established with the roller wiper as research object. By substituting the experimental parameters into the model, the effluent concentrations after molecular distillation could be calculated quickly, and the results were compared with actual concentrations with error range reduced to 1.5%—2.5%. The model provided a reference for optimal control conditions. The parameters could be adjusted by MATLAB. The influence of each structure parameter on the molecular distillation process was studied, and knowledge of changing tendency of simulation image helped to accurately determine specific detail in the design of molecular distillation device, providing a basis for wiped film molecular distillation device design.

Key words: molecular distillation, wiped film molecular distillation, roller wiper, mathematical model

摘要：

分子蒸馏器中加入刮膜器可以增强分子蒸馏过程中的传质效率。以辊筒式刮膜器作为研究对象,利用进料流量、液体浓度、刮膜电机转速以及蒸发器尺寸等主要因素之间的结构关系,建立刮膜式分子蒸馏的数学模型。通过将实验参数代入到该模型可以快速计算出分子蒸馏后流出浓度,并将计算出流出浓度与实际浓度相比较,误差范围缩小到1.5%～2.5%之间,为寻找最佳控制条件提供了参考。将该模型通过MATLAB依次调整每一个参数,研究每一个结构参数对分子蒸馏过程的影响,通过研究仿真图像的变化趋势,使分子蒸馏器的设计可以精确到具体数值,为刮膜式分子蒸馏器的设计提供了依据。

关键词: 分子蒸馏, 刮膜式分子蒸馏装置, 辊筒式刮膜器, 数学模型