Distillation flask A glass container used for liquid distillation or fractionation of materials, and is widely used in the fields of biology, chemistry, scientific research, and the like. There are many problems that users need to pay attention to when using the distillation flask. The following is a brief introduction to the precautions for the use of the distillation flask. It is hoped that the user can better apply the product.
Precautions for use of distillation flasks
1. Asbestos net should be placed when heating, or it can be heated by other heat baths. When heated, the amount of liquid does not exceed 2/3 of the volume, not less than 1/3 of the volume.
2. The main difference between the distillation flask and the round bottom flask in appearance:
The distillation flask is used for fractionating the liquid, so there is a thin glass tube protruding slightly downward at the neck of the bottle for drainage. In addition, heating from the distillation flask requires blocking the mouth of the bottle, and another tube must be extended.
In the round bottom flask, there is no such device, and the bottle neck is an ordinary straight tube.
3. When configuring accessories (such as thermometers), use a suitable rubber stopper, pay special attention to check whether the airtightness is good.
4. It is best to add a small amount of zeolite (or broken ceramics) to the bottom of the bottle beforehand to prevent bumping.
5. When heating, it should be placed on the asbestos net to make it evenly heated.
6. After the distillation is completed, the piston must be closed before heating is stopped to prevent back suction.
7. The position of the mercury balloon of the thermometer should be flush with the lower edge of the branch of the distillation flask.
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