What are the most important performance indicators for a rotary evaporator?
The first important thing to choose a rotary evaporator is the air tightness of the instrument, which is related to the normal use of the instrument and the service life of the instrument. The air tightness is closely related to the design level, manufacturing level and materials used by different brands. Specifically, it can be measured by "reaching vacuum degree" and "vacuum holding time".
What vacuum pump is suitable for the evaporator?
The vacuum pump is a must-have product for rotary evaporators. Evaporation of boiling point organic solvents usually require less vacuum (below 4KP), and can be equipped with a water circulation vacuum pump or a PTFE diaphragm pump (the latter is expensive). Evaporation of high-boiling materials usually requires high vacuum (above 0.4KP). It can be considered to be equipped with a mechanical rotary vane pump. However, it is not resistant to corrosion and must be protected by cold trap or other methods. At the same time, intermittent pumping is used in operation. The oil change interval can be extended.
Does the power of the bath affect the evaporation rate?
It has a great influence, especially for substances with large latent heat (such as water). When gasification, it absorbs a lot of heat energy. The fastest evaporation rate is almost proportional to the maximum heating power.
Is there a way to save energy in large evaporators?
50L rotary evaporator bath power 9KW, 20L rotary evaporator bath power 5KW, when multiple units are used together, power supply is often a problem. The optional steam heating device is an energy-saving and effective solution.
What is the difference between glass lifting and bath lifting?
Relatively speaking, the bath is safer to lift and the glass is not easily damaged. Moreover, it is not necessary to lock after the lifting is completed, and the operation is more convenient than the glass lifting.
Is the electric lift function heavy?
It is a icing on the cake. From the aspects of cost performance, safety, failure rate, etc., the number of manual lifters is the majority, and the explosion-proof requirements are almost ignored.
What should I do if the tap water temperature is not low enough to condense?
In summer, the tap water temperature is close to 30 degrees Celsius, and the solvent with a steam temperature of 30 degrees Celsius or less is almost impossible to recover. The following mulberry options are available:
1. The most suitable solution is to choose a cooling water circulating pump with matching cooling capacity. When selecting, pay attention to “cooling capacity†is more important than “lowest temperatureâ€.
2. Minicomputer (5L or less) can be equipped with "cold trap" with ice cooling, less money but need to add ice by hand.
3. Reduce the vacuum and increase the steam temperature. At the expense of evaporation rate, the temperature of the bath is constant.
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