Precautions for starting up and shutting down negative pressure distillation towers
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When starting up a negative-pressure distillation tower, should one create a negative pressure first and then increase the temperature, or should the temperature be increased first to establish circulation before creating a negative pressure? The same question applies when shutting down the tower. Why is this? Thank you
{:3_54:} Start first and then stop; definitely, negative pressure should be applied first. Wait until the temperature rises before introducing negative pressure, otherwise flash evaporation will occur and the entire system will be filled with messy materials. . . In severe cases, it can even damage the filler inside your tower
First apply negative pressure and then raise the temperature to remove inert gas; when shutting down, first stop applying negative pressure and then lower the temperature (the pressure will definitely drop during this process, so inert gas needs to be added)