__________ is not an important refinery process for upgrading the quality of lubricating oil.
A. Deoiling
B. Solvent refinning
C. Clay treatment
D. Hydrotreatment
Answer: Option A
Related Questions on Petroleum Refinery Engineering
Aniline point test of an oil qualitatively indicates the __________ content of an oil.
A. Paraffin
B. Olefin
C. Aromatic
D. Naphthene
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