Laboratory short range distillation is a thermal separation process of heat-sensitive products under vacuum conditions. The atmospheric pressure within the system is reduced by the addition of a vacuum, and when the pressure is reduced, the boiling point of the compounds contained will decrease. This process makes the extraction of heavier molecules faster and more efficient. Short residence time and low evaporation temperature will cause small thermal stress on the distillation product. It is designed according to the principle of molecular distillation. Typical applications are polymer organic compounds, chemical pharmaceutical, food health industry, industrial and other fields.