Internal Model Control In The Application Of Molecular Distillation Device

Molecular distillation under high vacuum conditions, the liquid molecules to heat escaping from the surface, the surface evaporation rate to achieve the separation of different molecular mean free path differences. Molecular distillation technology is a new separation method, distillation temperature, heating time is short, high degree of separation, Separation and Purification of natural products plays an important role.The level of industrial automation has become an important symbol of the measure of all walks of life the level of modernization. The internal model control in the course of several decades of development, the technology is mature, integrated into the contemporary technology of cash received wide application in many industries, the practice proved its reliability and stability.The internal model control study first task is to design an internal model controller, should first design an ideal controller, but not too much to consider system robustness and constraints, followed by the introduction of the filter, by adjusting the structure of the filterand parameters to obtain the desired dynamic quality and robustness. This internal model controller has the following characteristics:fast response; the practical application of the small amount of calculation, robustness, especially on the domination of the model has more advantages; can very easily design and robust performance; internal model control interference rejection capability of the process easier to ensure the robustness and stability.Film molecular distillation system according to the method of combining experimental and theoretical, mathematical model, the impact of Wiped-Film stills head wave and the liquid film evaporation rate, and to analyze the product in the distillation process of composition, concentration, and vacuum, distillation temperature, raw material flow and yield between the mathematical model to determine the model boundary conditions, the research model decoupling method, accuracy of the model is verified by experiments.This chapter describes the molecular distillation of the production process and process through the installation and use of the DCH-300wiped film molecular distillation, wiped film molecular distillation process control, internal model control applications in which this technologymathematical modeling and experimental approach to prove the feasibility of the control and the feed temperature in the distillation process, the feed rate and other parameters were analyzed for the DCH-300film molecular distillation to DBP (o-phenylenediaminethe dicarboxylate n-butyl) were simulated for the material, a preliminary discussion of the impact of feed temperature, the rate of change of the evaporation rate and yield of the distillation of According to the actual situation, adjust the various parameters in order to achieve the purpose of improve the yield.Omron programmable controller to control the core of the system, touch screen and computer network control method of combining molecular distillation system of automatic control systems and manual control system is designed according to the actual process of molecular distillation system.