Short-path evaporator - Import export

Short path distillation is a thermal separation technology operating at process pressures in the range of 1 to 0,001 mbar. It lowers the boiling temperature and is an excellent method for gentle thermal treatment of heat sensitive, high boiling products. The short path evaporator consist basically of a cylindrical body with a heating jacket, a rotor and an internal condenser. The rotor creates a mechanically agitated, thin product film on the heating surface inside of the body. By means of gravity the product flows down in a spiral path, whereby the volatile portion of the product evaporates. The vapour passes by the shortest route and with practically no pressure drop to the internal condenser. The non-volatile portion reaches the lower part of the evaporator and is discharged through the bottom product outlet. The residual vapours and inert gases flow through the vacuum nozzle to the vacuum system.

Because of the thermal sensitiveness of products, this separation method is applicable. The sample to be distilled is exposed only for a very short time to the heating substances because the film, created by the wiper, can evaporate very quickly. The residence time of medium on the heating surface is a matter of seconds, thus essentially less than in a reboiler flask, circulating evaporator etc. The evaporated product (operation pressures down to 103 mbar and temperatures up to about 300°C) has to pass a “short path” to the condenser only, which is located in the middle of the evaporator. Evaporators in borosilicate glass 3.3 are available with heat exchange areas 0.02…0.8 m². Evaporators in stainless steel can be heated by a heating jacket to higher temperatures with more heat transfer area for higher throughputs.

ILUDEST® designs / manufactures a comprehensive range of Teaching Units for the Thermal Process Engineering, e.g. Continuous distillation Thin film evaporation Short path evaporation Pulsed counter current extraction Absorption/desorption Residence time determination (reactor/cascade) etc. Other types and/or customized versions are available upon request.