Which of the following is not an important refinery process for upgrading the quality of lubrication oil?

solvent refining

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deoiling

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clay treatment

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hydrotreatment

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Solution

The correct option is B deoiling
In the refinery for lubricating oil, solvent refining, clay treatment and hydrotreatment are the important processes. The solvent used for refining purpose has to be pure. Clay treatment is done to remove colour, odour and sulphur from the oil.

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