Distillazione a percorso breve vs. distillazione semplice
There are several differences between the two, even though they are similar, but they still have differences between them. In order for you to know how to use something, you definitely need to understand it first; you need to know how it works because that will help you a lot.
Let us look at the differences between rotovap and the short path because it has been disturbing a lot of people. They do not know what a rotovap is, not what a short path is, and if they happen to know, they then assume that it is the same thing and if which it is not.
How It Works
Rotovap / rotary evaporators are devices used to remove a solvent from a sample. For this process to occur, the pressure should be lowered through the entire evaporation process, Rotovap simply separates a low solving solvent from solid compounds at room temperature while short path distillation is a technique used for the compounds that no longer become stable (unstable) when it is exposed to higher temperatures.
In addition to that, both of these two work differently, whereby the rotary evaporator rotates the evaporation flask by electric so as to expand the area of evaporation to accelerate the evaporating speed while the short path, decreases pressure in equipment known as the distillation equipment.
When it comes to the application area, rotovap is used to distill violent solvent under low pressure in a chemical, biology medicine, industrial and many others while short path separated and extracts high boiling points substances not only that but also the compounds that have been decomposed thermally, oxidized or polymerized and do not reach the boiling point.
Another difference is there different parts. A rotovap is made of a rotor, evaporation flask, vacuum pump, pressure measuring part, and protection, while the short path has a thick glass that protects it from exploding because of uneven force in the glassware.
The short path has; metal wiper elements, graphite rollers, graphite wiper elements, and spring-loaded PTFE and on the other hand, the rotovap evaporator has; a vacuum system that helps in reducing the pressure within the evaporator system, motor unit that rotates the evaporation flask, a vapor duct, vacuum system that reduces pressure in the evaporator system, a heated fluid bath to heat the sample, a condenser where coolant mixtures are placed and a motorized mechanism that lifts the evaporation flask from the heating bath.
Rotovap is more efficient as compared to the short path because the rotovap runs in a vacuum environment that protects the extractor solvents. The short path on the other side is not very pure because it can transfer some extracted solvents along the way from the evaporation flask to the receiving flask.
Parts and structures
They both have different parts and structures whereby the rotovap has one receiving flask and one evaporation flask while for a short path; there are more than two receiving flasks in the whole equipment and one evaporation flask.
A rotovap is commonly used when removing a solvent. The liquid produces a film in almost the entire surface of the flask as this film allows for a large surface area thus making the liquid evaporate faster; this method is good, especially if you are planning to remove a lot of solvents.
A short path is a type of distillation that is rarely used the reason being it does not have a good separating power and is even much slower than the rotovap, the short path distillation is also much cheaper and does not need a vacuum pump.
Those are the major differences between the two methods of distillation. Some people might have been thinking all along that they are the same thing; of course, they are a bit the same but with some differences that are mentioned above.