How to save energy in the kettle
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Currently, there are two substances in the kettle that need to be vaporized: water (accounting for 5%) and dichloromethane (accounting for 95%). The boiling points of these two substances differ significantly; if heating is carried out by waiting until the temperature reaches the boiling point of water, it seems like a lot of energy is wasted. I have the following idea; I’m not sure if it’s feasible, so I hope experts will kindly offer their advice. At the same temperature, dichloromethane is first distilled off under normal pressure, and then water is distilled off under reduced pressure; I wonder how feasible this approach is
I haven’t seen negative-pressure steaming very often; negative pressure is also a form of energy
It won’t be possible to first evaporate dichloromethane and then water as you might think, because what’s happening is evaporation rather than distillation. In fact, dichloromethane and water evaporate according to Raoult’s law; both substances are present in the first bubbles. Moreover, since it’s a batch process, the concentrations of these two substances keep changing over time, with more water appearing as the process progresses.
Don’t water and dichloromethane separate into layers? Just distill them after they separate