Questions You Need to Know before Buying a Rotary Evaporator

re501 rotary evaporaator
re501 rotary evaporaator

With the increasing number of rotary evaporator modes, many customers are confused to choose the mode they need when buying a rotary evaporator. If you have any trouble in purchasing a rotary evaporator, you had better have a basic understanding of the following questions.

What are the key performance indicators to pay attention to when purchasing a rotary evaporator?

The most important index of a rotary evaporator is the air tightness, which has a great influence on the operation and service life of a rotary evaporator. Actually, air tightnesses waries of rotary evaporators varies from each other because of different brands, designs, manufacturing levels and sealing materials. So customers should specially pay attention to this point when purchasing a rotary evaporator. The air tightness can be measured by reference to the vacuum achieved and the vacuum holding time.

Electric lift or manual lift, which one is better?

Electric lifting like icing on the cake. But some cases with explosion-proof requirements almost do not consider electric lifting. Considering the cost performance, safety, failure rate and other factors, more customers buy manual lifting rotary evaporators.

How to choose a matching vacuum pump when purchasing a rotary evaporator?

The vacuum pump is one of the necessary supporting products of rotary evaporators, users can choose according to the actual situation. Generally speaking, desk top vacuum pump is one of the hot products for its light weight, anti-corrosion, pollution free as well as low cost, and it is suitable for rotary evaporators whose volume is under 5L. More than 5L rotary evaporators use vertical vacuum pumps, which also features pollution free, corrosion resistance and larger pumping capacity. The working medium of rotary vane vacuum pump is oil, with high speed, large pumping capacity, which can be used alone or as a pre-stage pump and pre-pump for various high vacuum systems. The diaphragm vacuum pump is small in size, light in weight, and powerful in pumping work, but it is higher in cost than the above. Does the power of the bath pan affect the evaporation rate? The power of the water bath greatly affects the evaporation speed. In particular, when vaporizing a substance with a large latent heat such as water, gasification absorbs a large amount of heat energy, and its fastest evaporation rate is almost proportional to the maximum heating power.

rotary evaporator
rotary evaporator

What if the temperature of the water is not low enough to condense?

In summer, the tap water temperature is close to 30 ° C, and the solvent with a steam temperature of 30 ° C or less is almost impossible to recover. At this point we can use the following methods:

  1. Choose a low temperature circulating water pump. Note that the refrigerating capacity is more important than the minimum temperature.
  2. Small rotary evaporator below 5L can be equipped with cold traps for ice cooling, which costs less but requires ice to be applied by hand.
  3. Reduce the vacuum degree and improve the steam temperature,At the expense of evaporation rate, the temperature of the bath is constant.

Is there any difference between glass lifting and bath pan lifting?

The bath pan is generally safer to lift, the glass is not easily damaged, and it does not have to be locked after the lift is completed. The operation is more convenient than the glass lifting.

I hope that the answers to these questions will help you purchase a rotary evaporator. If you have any other questions, please contact US.

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