ZZKD teaches you how short path distillation units works

The pressure difference between the boiling film and the condensing surface is the driving force of the flow of the steam, which causes a flow of steam for a small pressure drop. Operation at 1 mbar requires a very short distance between the boiling and condensing surfaces. A distiller based on this principle is called a short path distillation. The short path distiller (molecular distillation) has a built-in condenser on the opposite side of the heating surface and reduces the operating pressure to 0.001 mbar.

SPD-2L short path distillation unit
 

The short-path distiller units is a thermal separation process operating at a pressure of 1 to 0.001 mbar. Its low boiling temperature is ideal for heat-sensitive, high-boiling substances. The basic structure consists of a cylindrical cylinder with a heating jacket, a rotor and a built-in condenser; a wiper and anti-splash device are precisely mounted on the holder of the rotor. The built-in condenser is located in the center of the evaporator and the rotor rotates between the cylindrical barrel and the condenser.

 

The short path distiller consists of an externally heated vertical cylinder, a central condenser located in it, and a wiper that rotates between the distiller and the condenser.

 

The distillation process is: the material is added from the top of the evaporator, and is continuously and evenly distributed on the heating surface through the liquid distributor on the rotor, and then the wiper scrapes the liquid into a very thin, turbulent liquid film. And push it down in a spiral. During this process, the light molecules that escape from the heating surface condense into a liquid on the built-in condenser after a short route and almost no collision, and flow down the condenser tube through the discharge tube at the bottom of the evaporator. Discharge; the residual liquid, that is, the heavy molecules, is collected in a circular passage under the heating zone, and then flows out through the discharge pipe on the side.