Solvent used in duo-sol extraction for lube oil upgradation is a mixture of______________?
Correct answer: A. Propane & phenol-cresol mixture
- A. Propane & phenol-cresol mixture
- B. Methyl ethyl ketone & glycol
- C. Phenol & furfural
- D. Propane & liquid sulphur dioxide
Explanation
Duo-sol extraction uses a two-solvent system consisting of liquid propane and a phenol-cresol solvent mixture. Propane promotes separation of paraffinic components while the polar solvent extracts less desirable aromatic material.
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