Consult about the water scrubber tower
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The water in the wash tower enters from the top, while butane enters from the bottom; the pressure is 4 kilograms, and both are in liquid phase. How does the liquid-phase butane manage to pass through the water and reach the top of the tower?
No trays or packing? Is it an empty tower?
Rely on the principle of buoyancy! ! ! ! ! ! ! ! ! ! ! ! ! ! !
It relies on the density difference; C4 has a lower density!
Look for animations of sieve plate extractors online; they are quite clear~
The buoyancy provided by water to C4 is greater than its own weight, so it moves towards the top of the tower