____________ is not an important refinery process for upgrading the quality of lubricating oil ?
Correct answer: A. Deoiling
- A. Deoiling
- B. Solvent refining
- C. Clay treatment
- D. Hydro-treatment
Explanation
Deoiling is mainly associated with separating oil from wax during wax processing, rather than upgrading the quality of the lubricating-oil fraction itself. Solvent refining, clay treatment, and hydrotreatment are used to improve lube-oil quality.
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