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.
Germany
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.
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Stone separation machines are used in flour factories to separate materials such as stone, metal, glass and soil in wheat that have a specific gravity different from wheat. It is an indispensable machine especially for dry system cleaning units. Stones and similar substances can easily enter the wheat from nature. If these substances are not separated from the wheat, the flour or ash content will be high as a result of grinding. This is also an undesirable feature.
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