What is the principle behind a demulsification tank?
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A component in the oil-water separator.
Solutions to the emulsification problem: (1) Let it stand for an extended period of time； (2) If emulsification occurs due to alkalinity, a small amount of acid can be added to break it down, or filtration can be used to remove it ； (3) If emulsification occurs due to the partial miscibility of the two solvents (water and organic solvent), a small amount of electrolyte (such as sodium chloride) can be added to disrupt it through salting out. Furthermore, adding table salt can increase the specific gravity of the aqueous phase, which is beneficial for separation when the specific gravities of the two phases differ by little ； (4) Heat to break the emulsion, or add a few drops of ethanol, sulfonated castor oil, etc. to reduce surface tension
Could it be the fourth item you mentioned? Our oil-water separator process is as follows: heater (to 60°C) → demulsification tank → vacuum tank → oil discharge pump
It might be the fourth point you mentioned; there is a heater in front of this tank.