Question

Why we can't separate oil from water by filtration technic?​

Answer 1

Answer:

You can use gravity oil separator (API separator) which sizing follows the "free sedimentation" law with the addition of a deformation coefficient of the oily particles.

The API (American Petroleum Institute) recommends the use of the following equation for the oil ascensional rate in m/h:

oil ascensional rate=0.443*(oil relative density - water relative density)/(water viscosity in poise)

The oil "particle" diameter is taken >= 0.15 mm and the water and oil density have to be preferably determined in laboratory.

The oil separator efficiency can be enhanced using PPI (parallel plate interceptor) with a slope of 45°.

The floated oil can be removed from the surface of the disoleator through a spillway.

Answer 2

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❥︎ Why we can't separate oil from water by filtration technic ???

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❥︎ The water is polar, which means each molecule has parts with small positive and negative electric charges. Oil is very nonpolar, which is why it doesn't mix well with polar liquids.