Short range distillation is designed based on the principle of molecular distillation and is a model that simulates molecular distillation. Due to the close distance between the heating and cooling surfaces and the low resistance, it is called short range distillation. Due to the built-in condenser, it can instantly liquefy the vaporized vapor phase and shrink its volume, thus maintaining a high vacuum inside the equipment. The operating vacuum of the short-range distiller can reach 1Pa, which is difficult for other evaporation and distillation equipment to achieve. Therefore, short-range distillation is particularly suitable for materials with high boiling points under normal pressure that are difficult to separate using ordinary separation methods. As a new type of liquid-liquid separation equipment, it has gained successful experience in many industries.