1. The vacuum degree can reach 0.1Pa, greatly reducing the boiling point of materials. After using Molecular Distillation, the material with high boiling point can be separated.
2. In the mixture liquid, both the boiling point of material is close so as not to be abe to separated. After using Molecular Distillation, the material can be separated.
3. Materials with high thermal sensitivity will deform when heated. Choosing molecular distillation can solve your liquid separation. After using Molecular Distillation, the material can be separated.
4. Ordinary distillation takes too long. Molecular distillation is selected to provide separation efficiency. After using Molecular Distillation, the material can be separated.
Molecular distillation is a type of short-path vacuum distillation, characterized by an extremely low vacuum pressure, 0.01 torr or below.[1] It is a process of separation, purification and concentration of natural products, complex and thermally sensitive molecules for example vitamins and polyunsaturated fatty acids. This process is characterized by short term exposure of the distillate liquid to high temperatures in high vacuum (around 10−4 mmHg) in the distillation column and a small distance between the evaporator and the condenser around 2 cm.[2] In molecular distillation, fluids are in the free molecular flow regime, i.e. the mean free path of molecules is comparable to the size of the equipment.[3] The gaseous phase no longer exerts significant pressure on the substance to be evaporated, and consequently, rate of evaporation no longer depends on pressure. The motion of molecules is in the line of sight, because they do not form a continuous gas anymore. Thus, a short path between the hot surface and the cold surface is necessary, typically by suspending a hot plate covered with a film of feed next to a cold plate with a line of sight in between.
This process has the advantages of avoiding the problem of toxicity that occurs in techniques that use solvents as the separating agent, and also of minimizing losses due to thermal decomposition. and can be used in a continuous feed process to harvest distillate without having to break vacuum.
Molecular distillation is used industrially for purification of oils. It is also used to enrich borage oil in γ-linolenic acid (GLA) and also to recover tocopherols from deodorizer distillate of soybean oil (DDSO)
Senco Technology Co., Ltd
You may come to our factory to do suitable experiment to test whether your material can be separated.
It depends.
Due to historical reason, many old lab still use ST24 neck for their evaporation flask, but in new labs, more and more users apply ST29 neck because it has bigger diameter for vapors go through during evaporation, which is better for evaporation efficiency. Meanwhile, to apply ST29 neck can aslo enjoy evaporation flask unload function on SENCO's rotary evaporator, that do helps to reduce your headache when there is some dead seizure on ground joint between evaporation neck and the vapor duct.
All SENCO export lab rotavapors equips with ST29 evaporation neck.
The first important choice on the rotary evaporator is the air tightness of the instrument. This is related to the normal use of the instrument and the service life of the instrument. Air tightness has a great relationship with the design level, manufacturing level and material adoption in different brands. It can be specifiy by measurement with "arrival vacuum" and "vacuum holding time".