Rotary evaporators are common instruments in the laboratory. It is mainly used for continuous distillation of a large amount of volatile solvents under reduced pressure. Rotary evaporators are primarily used to continuously distill large amounts of volatile solvents under reduced pressure. In particular, the concentration of the extract and the distillation of the receiving liquid in the chromatographic separation can separate and purify the reaction product. The southeast science and technology technical engineer will give you a detailed introduction to the use of the rotary evaporator.
    First, a part of the rotary evaporator installation interface should be added a small amount of gentleman's forest, to avoid vacuum, the interface part of the leaking vacuum can not go up. Vacuum silicone oil is required. When the ordinary gentleman's vacuum pressure is high, it is easy to bond and can not be removed! The liquid level in the bottle is better than the liquid surface heated by the water bath to avoid damage to the central axis!!
Second, pay attention to the steps:
1. Before starting the steaming, adjust the angle of the egg-shaped bottle, the water bath, and the steamer port for the sample, and then load the sample into the egg-shaped bottle to prevent the loss of the sample during the installation of the rotary evaporator. And damage to the spinner port.
    2. After the egg-shaped bottle containing the sample is smoothly connected with the steamer port, first turn the rotary button to check whether the rotation is flexible. More importantly, see if the steamed sample is completely or mostly immersed in the water bath. In order to ensure the steaming efficiency.
    3. The sample contained in the eggplant bottle should not exceed 75% at most, otherwise there will be a reverse suction when decompressing.
    4. Next, install the container containing the distillate. Pay attention to the use of some gentlemen's forest when connecting, to ensure good sealing, turn off the cooling water, close the venting valve, open the decompression device, and perform vacuum distillation.
    5. During the decompression process, adjust the temperature of the water in the water bath to match the boiling point of the sample you are steaming. This can be done from the return tube.  The state of the reflux liquid is seen to be optimal when the reflux liquid is in the form of drops instead of water.
6. At the end of the rotary evaporator, the venting valve should be opened first to make the air pressure inside and outside the rotary evaporator consistent, then turn off the rotary switch and remove the eggplant bottle.
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