How to choose the coolant for the melt crystallization process (-15–40°C)?
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During the melt crystallization process, there are both cooling and heating steps involved; for example, the material is first cooled to -5°C for crystallization, and after some time it is heated to 13°C to facilitate sweating. As for choosing a coolant within this temperature range, or whether it’s necessary to switch coolant, and if so how to do that, I would appreciate any advice from everyone.
Two sets of heat exchangers are used; after cooling and crystallization are completed, the process is switched to the heating heat exchanger. Once heating and evaporation are finished, the water is drained, and the material can then be vaporized using steam.
The coolant can be frozen saline, or a mixture of ethylene glycol/water/glycerol/water. I’m not sure what type of equipment you have; the most convenient approach is to add a heat exchanger to regulate the temperature of the coolant. This makes it easier to control the temperature, and it also eliminates the need to switch between different cooling media.