Laboratory rotary evaporator manufacturer supplier price for sale.The distillation efficiency of the laboratory rotary evaporator is an important performance. The distillation efficiency determines the efficiency of the experiment on the one hand, and the quality of a product on the other hand. The distillation efficiency of a laboratory rotary evaporator determines the number of samples that can be distilled per day. One obvious truth is that the higher the distillation efficiency, the higher the number of samples distilled in the same solvent. So how to improve the distillation purification efficiency of the laboratory rotary evaporator?

    1. The temperature of the cooling medium To ensure the distillation efficiency, the cooling medium is generally recommended to maintain a temperature difference of about 40 ° C with the temperature of the heating pot in order to rapidly condense the hot steam, thereby reducing the influence of steam on the system vacuum.

    2. The temperature of the heating pot The higher the temperature of the heating pot of the laboratory rotary evaporator, the faster the distillation effect of the solvent, but considering the safety of the operation and the heat sensitivity of the target component, the commonly used temperature is 60 ° C and then 80 ° C or more. However, silicone oil media is difficult to clean. Generally, we recommend that customers achieve faster distillation efficiency by lowering the vacuum value.

    3. Vacuum value of the system The closed space components of the laboratory rotary evaporator are as follows: evaporation bottle, evaporation tube, sealing ring, condensing tube, vacuum buffer bottle, vacuum pump, vacuum line. The factors affecting the system vacuum are vacuum pump and sealing ring. And vacuum tube. In general, the lower the vacuum pump limit, the lower the vacuum value of the system. Therefore, it is necessary to set a reasonable vacuum value through the vacuum controller during distillation to ensure the distillation efficiency while avoiding bumping. The ultimate vacuum of the circulating water pump is about 0.095 kPa, and the ultimate vacuum of the diaphragm vacuum pump is up to 2 mbar. However, if the budget allows the addition of a vacuum controller or vacuum valve, it can control the system vacuum required for distillation. As a key seal for the evaporation tube and the condensing tube, the sealing ring is the key to its wear resistance and corrosion resistance. Often used as a seal ring material is PTFE and rubber, PTFE wear resistance and corrosion resistance will be better than rubber. The silicone tube is naturally a vacuum tube because its aging efficiency is slower than that of a normal rubber tube.

    4. Rotating speed of the evaporation bottle The speed of the evaporating bottle of the rotary evaporator is the faster the evaporation speed of the evaporating bottle, and the larger the area of ​​the inner surface of the bottle is, the larger the heating area is; but the thicker the liquid film is, the higher the heat transfer temperature difference is. There is a rotational speed for the materials of different viscosities and the rotational power is provided by the motor.

    5. System Size and Power: The distillation rate in a given system is primarily limited by the ability of the condenser to condense solvent vapor (rarely limited by the heater). If you let too much steam into the condenser, it will overload and not work effectively, which will result in valuable volatile loss. To avoid saturation, you should monitor the system pressure so that the 2/3 condenser is always covered by condensate. If liquid begins to form at the top 1/3 of the coil, there is a risk that the incoming steam will be drawn into the vacuum pump and lost forever. In practice, we often keep the condensate close to 3/4 of the condenser. Another indicator is the “condensation line”, which is usually located above the area of ​​the coil where the actual liquid is seen. This is easily seen in water distillation but is difficult to see in alcohol distillation.