You must be familiar with the distillation bottle. It is a glass container for liquid distillation or fractionation. It is often used with a condenser, a liquid pipe, or a liquid adapter. It can also be equipped with a gas generator.
Precautions for use of the distillation flask.
Asbestos mesh should be placed when heating, or it can be heated by other heat baths;
When heated, the amount of liquid does not exceed 1/2 of the volume.
What is the main difference between the distillation flask and the round bottom flask?
Because the distillation flask needs to be used for fractionating liquid, there is a thin glass tube protruding slightly downward at the bottle neck, which can be used for drainage, and the distillation flask needs to block the bottle mouth when it is heated, and another tube must protrude. The bottom flask does not have this device, and the bottle neck is an ordinary straight tube.
What is the amount of liquid in the distillation flask?
At atmospheric distillation, the liquid contained in the distillation flask shall not exceed 2/3 of its volume, nor less than 1/3;
When heated, the liquid cannot be evaporated to dryness;
When distilled under reduced pressure, the liquid contained should not exceed 1/2 of its volume.
The cleaning method of the distillation flask in several cases!
1. Organic experiment
It can be washed with organic solvent. When doing organic synthesis, when washing the bottle, avoid using it without washing. It is best to treat it first, and then wash it with water. In organic experiments, there are often organic solvents such as waste ethanol, methanol, and chloroform, which can be recycled in bottles to handle some difficult-to-wash bottles.
2. How to clean the distillation bottle after the sulfur dioxide experiment?
After the sulfur dioxide test, it is scrubbed with an alkaline aqueous solution (usually with a low concentration of sodium hydroxide or a general concentration of sodium carbonate), and then thoroughly rinsed with distilled water;
Teach you to choose a distillation flask!
Generally, in addition to the distillation volume of the appropriate volume according to the amount of the liquid to be distilled, depending on the boiling range of the liquid to be distilled, a distillation flask having a different branch position is selected to obtain a better experimental effect.
1. For the distillation of high-boiling liquid, a distillation flask with a branch pipe at the lower part of the bottle neck is generally selected, and the iron clip should be sandwiched in the upper part of the branch pipe.
2. For the distillation of low-boiling liquid, a distillation flask with a branch pipe at the upper part of the bottle neck is generally selected, and the iron clip is sandwiched under the branch pipe.
3. For the distillation of general boiling point liquid, a distillation flask with a branch pipe in the middle of the bottle neck can be selected. Considering the smoothness of the device during distillation, the iron clip should be sandwiched under the branch pipe. . .
Finally
When boiling, it is necessary to add a boil-off material such as zeolite. On these azeotropes, a gasification center can be formed, so that the bubbles can be continuously and evenly uniform when the solution is boiled, and no bumping occurs. The phenomenon of bumping is that a large bubble suddenly appears and the solution may rush out of the distillation flask, which is very dangerous.
In case you require any information or have doubts, feel free to reach out to WUBOLAB, the laboratory glassware manufacturer.
