A visible scrubber stack plume does not automatically indicate mist eliminator failure. Water-vapor condensation, fine aerosol, chemical particle formation, and true liquid carryover can all produce visible emissions and require different solutions.

Conventional wire mesh mist eliminators can remove many fine droplets but should not automatically be assumed suitable for true submicron aerosol. Very small particles may require fiber-bed or multistage separation depending on aerosol size, fouling, pressure drop, and outlet requirements.

In vacuum systems, even modest mist eliminator pressure drop can raise upstream operating pressure and affect boiling temperature, vacuum capacity, energy demand, and throughput. Actual vapor volume, wet pressure drop, drainage, and fouling margin are therefore critical design inputs.

Sticky, oily, or viscous mist can remain on wire surfaces, increase liquid holdup, trap particles, and rapidly plug dense mesh. Separator selection should consider viscosity, temperature, fouling, cleanability, and long-term operating stability.

Debottlenecking can overload an existing mist eliminator through higher actual gas velocity, increased liquid loading, stronger upstream entrainment, and reduced fouling margin. Existing separator dimensions should not automatically be assumed suitable for the new plant capacity.