Molecular distillation is a unique liquid-liquid separation technique that differs from traditional distillation, which relies on the principle of separation based on boiling point differences. Instead, it achieves separation through the difference in the average free path of the molecular motion of different substances.
As the liquid mixture flows along the heating plate and is heated, light and heavy molecules will escape the liquid surface and enter the gas phase. Due to the different free paths of light and heavy molecules, the molecules of different substances will have different distances to travel after escaping from the liquid surface. By appropriately setting up a condenser plate, the light molecules can reach the condenser plate, be condensed, and then removed, while the heavy molecules will not reach the condenser plate and will be discharged along with the mixed liquid, achieving the purpose of substance separation.
The driving force for steam flow in molecular distillation equipment is the pressure difference between the boiling surface and the condensing surface. Even a slight pressure drop can cause steam to flow. Operation at 1 mbar requires a short distance between the boiling and condensing surfaces. Distillers made based on this principle are called short-path distillers. Short-path distillers (molecular distillation) feature an integrated condenser opposite the heating surface, reducing the operating pressure to 0.001 mbar.
Short-range molecular distillation exchanger
The short-path molecular distillation unit directly forms a pressure difference between its condensing surface and thin surface during operation. This pressure difference serves as the driving force for the entire steam flow. Even a slight pressure drop within the unit can directly cause steam flow. During the operation of the molecular short-path distillation, the distance between the condensing and boiling surfaces is relatively short.
The short-path molecular distillation unit has a short residence time for materials inside the equipment, making it suitable for high-viscosity materials. During the selection process, the material used for construction can be chosen, which is a quartz glass with a low thermal expansion coefficient and high chemical stability.
The short-path molecular distillation unit operates with high intensity, featuring excellent corrosion resistance during usage. This product boasts good compatibility with the majority of reagents and chemical materials.
During the design process, scientific design principles and manufacturing techniques are employed. The components of the short-path molecular distillation unit are the distillation column, and the equipment's structure directly affects its separation efficiency during operation.
During the selection process of short-path molecular distillation units, it is crucial to choose an economically reasonable distillation temperature to ensure better stability during material processing. As steam molecules are flying from the evaporation surface to the condensation surface, collisions between them may occur.
During the operation of the short-path molecular distillation unit, the heat exchange between the environment and the columns can be completely avoided in contrast to traditional methods, thus directly preventing over-heating or under-heating that may cause human-induced imbalance and resultant errors in experimental data.
