What techniques are used for oil purification from moisture?

Techniques include:

Vacuum Dehydration: Evaporating moisture under reduced pressure.
Centrifugal Separation: Using centrifugal force to separate water.
Absorbent Materials: Employing desiccants or hygroscopic filters.
Coalescing Filters: Merging small water droplets into larger ones for removal.
Membrane Separation: Using hydrophilic membranes to extract water.
Removing moisture prevents corrosion and degradation of oil and components.