Mineral oils: processes and products – Refining – Halogen contaminant removal
Patent
1982-03-31
1983-09-20
Gantz, Delbert E.
Mineral oils: processes and products
Refining
Halogen contaminant removal
585864, 570211, 210909, C10G 2102, C10G 2112
Patent
active
044054483
ABSTRACT:
A process for removing halogenated aliphatic and aromatic compounds, e.g., polychlorinated biphenyls, from petroleum products by solvent extraction. The halogenated aliphatic and aromatic compounds are extracted from a petroleum product into a polar solvent by contacting the petroleum product with the polar solvent. The polar solvent is characterized by a high solubility for the extracted halogenated aliphatic and aromatic compounds, a low solubility for the petroleum product and considerable solvent power for polyhydroxy compound. The preferred polar solvent is dimethylformamide. A miscible compound, such as, water or a polyhydroxy compound, is added to the polar extraction solvent to increase the polarity of the polar extraction solvent. The halogenated aliphatic and aromatic compounds are extracted from the highly-polarized mixture of water or polyhydroxy compound and polar extraction solvent into a low polar or nonpolar solvent by contacting the water or polyhydroxy compound-polar solvent mixture with the low polar or nonpolar solvent. The halogenated aliphatic and aromatic compounds and the low polar or nonpolar solvent are separated by physical means, e.g., vacuum evaporation. The polar and nonpolar solvents are recovered from recycling. The process can easily be designed for continuous operation. Advantages of the process include that the polar solvent and a major portion of the nonpolar solvent can be recycled, the petroleum products are reclaimable and the cost for disposing of waste containing polychlorinated biphenyls is significantly reduced.
REFERENCES:
patent: 1103499 (1914-07-01), Friese
patent: 1584588 (1926-05-01), Acheson
patent: 2484469 (1949-10-01), Schaeffer
patent: 3249532 (1966-05-01), Shiah
patent: 3400171 (1968-09-01), Van Pool
patent: 4105542 (1978-08-01), Fainman
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Chemical & Engineering News, "PCB Process Demonstration Begun," Nov. 2, 1981, p. 2.
Googin John M.
Napier John M.
Travaglini Michael A.
Besha Richard G.
Gantz Delbert E.
Hamel Stephen D.
Larcher Earl L.
McFarlane Anthony
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