Perform vacuum distillation in the laboratory. Boiling over problem.
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That is, the vacuum level can be achieved at the beginning
This post was last edited by chengkang on 2009-5-12 09:26. My situation is as follows: I am using an oil bath heater with a stirrer, and boiling over occurs during vacuum distillation; even after adding broken porcelain pieces, boiling over still happens. I don’t know the reason. Is the vacuum level too high?
When the pressure is too low, the boiling point of the oil decreases. Under that pressure of yours, don’t some gas components evaporate at 60 degrees? Thereby breaking your vacuum!
Does stopping the vacuum pumping mean that non-condensable gas must be continuously pumped out? Otherwise, a drop in vacuum level can easily lead to problems
A small capillary tube can be made from an old thermometer, with one end exposed to the atmosphere and the other end inserted into the liquid in the reactor; this helps to prevent boiling over