Regarding the selection of the negative pressure extraction location for the negative pressure tower?
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Why do some designs involve vacuuming above the reflux drum while others do it above the top condenser? What are the advantages and disadvantages of each approach?
If the volume of non-condensable gas is high, evacuate behind the reflux tank.
Personally, I think it’s better to evacuate the vacuum at the return tank; at least in this way, some of the non-condensable gases can be separated after condensation and cooling. If evacuation is done at the condenser, what is removed is a mixed gas.
Not only that, but it also causes many problems for the vacuum pump; however, it is still designed to be placed on the condenser