Please tell me how to distill high boiling point substances under reduced pressure.
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High boiling point substances, such as silicone oil, have a normal pressure of nearly 600°C. Some substances have a melting point of 60-62°C and a boiling point of 110-114°C /0.6mmHg, about 80Pa. How can vacuum distillation be achieved in laboratories and industries? I also saw a Bulb-To-Bulb Distillation method in the literature, as shown in the picture! Please enlighten me!
According to the different physical properties of each medium, the pressure is changed for heat exchange distillation. Refer to the cryogenic air separation process (can be found on Baidu).
Use a vacuum pump to reduce the system pressure below 0 gauge pressure, which is vacuum distillation. There should be a lot of information on this
It’s easy to reduce stress, but to what extent! Otherwise, why is there the Bulb-To-Bulb experimental device above.
Distillation usually separates substances with different but close boiling points, and distillation often separates substances with widely different boiling points. The vacuum distillation (or distillation) of high-boiling point substances is generally carried out in a vacuum state. It is determined whether it is ordinary vacuum or high vacuum according to its boiling point, and is realized by controlling the heating temperature.
In the refinery, a multi-stage jet vacuum method is used to depressurize the tower reactor at nearly 400 degrees.