How can oil be purified from water and impurities?

Purification methods include:

Vacuum Dehydration: Evaporating water under low pressure.
Centrifugation: Separating water and impurities by density.
Coalescing Filters: Aggregating water droplets for separation.
Adsorption: Removing dissolved water and impurities using absorbent materials.
Filtration: Eliminating solid particles with fine filters.
Combining these methods effectively restores oil purity.