Aromatic extraction thermal siphon
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Thermal siphon principle of the reboiler at the bottom of the aromatic gas-liquid extraction tower
The principle is that the inlet is entirely in the liquid phase with a high density, while at the outlet, heat flow causes the formation of a gas phase; thus, the outlet consists of a gas-liquid mixture with a lower density. This results in a static pressure difference between the inlet and outlet, which serves as the driving force to overcome the flow resistance.
It’s explained in great detail in point 2: it involves using the static pressure difference generated by phase change
The different import and export densities create a pressure difference that forces the medium to circulate