Short Path Distillation Kit

Short path distillation kit is based on the volatility differences between molecules and utilises a rapid process of vapourisation and condensation in a high vacuum environment to achieve separation of the components of a mixture. Its working principle mainly includes the following points:
The molecular free range principle: In a high vacuum environment, the average free range of gas molecules increases significantly, i.e. the average distance a molecule can travel between two collisions increases. This allows lighter molecules to reach the condensation surface more easily.
Heating and condensation: The material is heated to a temperature at which the volatile components begin to evaporate. Due to the special design of the short distillation unit, the distance between the heating and condensation surfaces is very short (usually between a few centimetres and several tens of centimetres, or even 0.1 mm to 0.5 mm in some high-precision equipment), which allows the light molecules to reach the condensation surface and to condense without multiple collisions.
Molecule screening: During short-range distillation, heavier molecules have difficulty reaching the condensation surface due to their short mean free range, while lighter molecules are able to reach the condensation surface and condense without difficulty. In this way, by controlling the heating temperature and system pressure, the effective separation of substances with different boiling points can be achieved.

The operating procedure of a short path distillation kit usually consists of the following steps:
Installation and Preparation: Install the sampler, receiving bottle and other components and turn on the cooling water circulation button. Make sure that all components are connected tightly and in good condition.
Starting the vacuum system: Switch on the vacuum pump and adjust it to the appropriate pressure range. It is usually necessary to stabilise the pressure before proceeding to the next step.
Heating and Evaporation: Adjust the heating system to the desired evaporation temperature and start the rotor of the film scraper (if present) to promote uniform evaporation of the material.
Condensation and collection: The vapour molecules are ejected over a short distance to the condenser and rapidly condense into liquid. The condensed liquid is collected through a collection system.
Finishing and cleaning: Switch off the heaters, vacuum pumps and other components and wait for the equipment to cool down before cleaning. Cleaning can be carried out with solvents such as anhydrous ethanol.

High-vacuum distillation: The short path distillation kit is able to operate at very low pressures of approx. 0.001 mbar, significantly lowering the boiling point of the evaporated components.
Short travelling distances: The short distances from evaporation to condensation of the evaporated components reduce the pressure losses and allow very low pressures to be reached.
Low heat load: Due to the short residence time in the equipment, the substance is subjected to a very low heat load.
Various film scraping systems: Depending on the explosion protection requirements and operating conditions, the Short Range Distillation Kit can be supplied with different film scraping systems.

Short path distillation kit is widely used in the chemical, pharmaceutical, food and grease industries:
Chemical: for separation and purification of complex and heat-sensitive mixtures such as silicone oils, resins, amines, pesticides, etc.
Pharmaceutical: for distillation of pharmaceutical intermediates and active substances, improvement of concentration and colour of amino alcohols, solvent recovery, etc.
Foodstuffs: for extraction or concentration of heat-sensitive substances, such as monoglycerides, lecithin, sterols, carotene, lactic acid, etc.
Oils and fats: for removing impurities, preserving heat-sensitive components such as carotenoids and micronutrients, and improving product quality.

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