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Solvent used in duo-sol extraction for lube oil upgradation is a mixture of______________?

/ Petroleum Refinery Engineering / By
Solvent used in duo-sol extraction for lube oil upgradation is a mixture of______________?

A. Propane & phenol-cresol mixture
B. Methyl ethyl ketone & glycol
C. Phenol & furfural
D. Propane & liquid sulphur dioxide