How to recover dichloromethane by vacuum distillation
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In production, dichloromethane is used as a solvent; during recovery, vacuum distillation is required because the temperature cannot be too high. How can the recovery rate of dichloromethane be improved?
Where is it? I can design this for you.
Dichloromethane has a low boiling point – why is reduced pressure needed then?
Because the temperature of the distillation kettle cannot be too high, dichloromethane cannot be vaporized at atmospheric pressure, so reduced pressure is used.
At what temperature was it steamed? If the pressure is reduced, heating may not be necessary; it’s just more troublesome to recover the substance. I suggest recovering it after pumping, but the investment in a vacuum pump is quite high
The recovery loss after the pump is quite large
How can the recovery after the pump be greater than the loss before the pump? Recovery after pumping yields good results, but if you have requirements regarding the quality of the recovered dichloromethane, it is recommended to carry out recovery before pumping; however, this approach requires higher temperature conditions
It needs to be distilled at below 20 degrees
The distilled liquid is to be reused, and there are requirements regarding the quality of the distilled dichloromethane
For vacuum distillation of dichloromethane, if recovery before pumping is desired, it depends on what cooling medium is used in the condenser as well as whether its surface area is sufficient. A further stage of recovery can be added after pumping.
What is the pressure in the vacuum tower? I think it’s possible to evaporate dichloromethane at atmospheric pressure as well. There are many similar devices in use in practice