There are two options for this. First one is the barometric condenser and the second one is condenser(either tube and shell or surface etc.) with a vacuum pump.
Where you have sufficient height of the building, the process connection from the vessel to the vacuum pump is connected with a condnser whose height should minimum be equal to the liquid column height at perfect vacuum. The bottom of the condenser is immersed in a liquid bath. As the vacuum holds the liquid column, the extra fluid flows into the liquid bath and then is collected as overflow.
Barometric condensers are generally used with steam jet ejectors with a barometric leg of above 10 meters.What is a barometric condenser in an edible oil refinery plant for?
that's a pretty tough question to ask.
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