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Laboratory rotary evaporator distillation method when to choose atmospheric distillation when to choose reduced pressure distillation?
Atmospheric distillation or reduced pressure distillation is not just a rotary evaporator, for low boiling point, chemical stability, atmospheric pressure can be, do not have to decompression;reduced pressure distillation is used for higher boiling point, difficult to volatilize, high temperature nature of the unstable and other circumstances of the distillation of substances.
As for the rotary evaporator, there is also an additional function of rotation, can let the liquid adhere to the inner wall of the flask, increase the evaporation area, improve the evaporation efficiency. As for the use of atmospheric pressure or reduced pressure, depending on the stability of the nature of the material, stable performance and lower boiling point of the material selection of atmospheric pressure can be experimented. On the contrary, for the higher boiling point of the difficult to volatilize the material should be selected to reduce the pressure of distillation, decompression distillation is generally faster than the speed of atmospheric pressure.
A rotary evaporator is a type of laboratory equipment used to evaporate solvents in solution, and is particularly suitable for the distillation of heat-sensitive substances. The following factors should be considered when selecting a rotary evaporator for distillation:
Distillation speed:
Fast distillation:suitable for situations where rapid removal of solvent is required, but may lead to degradation of heat-sensitive substances.
Slow distillation:suitable for heat-sensitive substances, can reduce the heat damage to the sample, but the distillation time is longer.
Temperature control:
Temperature gradient distillation:separates components with different boiling points by gradually increasing the temperature, suitable for distillation of complex samples.
Constant Temperature Distillation:Distillation at a set temperature, suitable for distillation of single or similar boiling point solvents.
Solvent Recovery:
Direct Recovery:The solvent is recovered directly through the condenser during distillation.
Indirect Recovery:The solution after distillation is subjected to solvent recovery by other methods(e.g., distillation column).
Sample type:
Small sample distillation:applicable to the distillation of a few samples.
Large sample distillation:applicable to the distillation of batch samples, may require special evaporator and condensation system.
Equipment Functions:
Basic function:basic rotary evaporation function.
Advanced functions:such as real-time distillation rate monitoring, automatic temperature control, vacuum control, etc.
Laboratory Conditions:
Space constraints:if the laboratory space is limited, you may need to consider the size and footprint of the equipment.
Budget constraints:choose the right configuration of rotary evaporator according to the laboratory's budget.
Safety features:
Automatic power-off:In the event of abnormal conditions, such as overheating or overpressure, the equipment is capable of automatic power-off to ensure safety.
Explosion-proof design:For flammable and explosive solvents, select a rotary evaporator with explosion-proof design.
When deciding the distillation method of the rotary evaporator, the decision should be based on the specific needs of the experiment and the characteristics of the sample.If you need more professional guidance,you can consult the technical personnel of the equipment supplier, or refer to the relevant laboratory manuals and scientific literature.
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