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Upgrading of middle distillates with coordinated complexes

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  • 4. AN IMPROVED PROCESS FOR EXTRACTING BI-CYCLIC AROMATIC HYDROCARBON COMPOUNDS FROM A MIDDLE DISTILATE PETROLEUM FRACTION, WHICH COMPRISES CONTACTING SAID MIDDLE DISTILLATE PETROLEUM FREACXTIN WITH A COORDINATED COMPLEX AT A TEMPERATURE IN THE RANGE OF FROM 15 TO 50* C. TO FORM A MIDDLE DISTILLATGE RAFFINATE AND A PREDO/MI-NANTLY BI-CYCLIC AROMATIC EXTRACT CLATHRATED IN SAID COORDINATED COMPLEX, THE AMOUNT OF SAID COORDINATED COMPLEX CONTACTED WITH SAID MIDDLE DISTILLATE BEING IN THE RANGE OF FROM 1 TO 10 MOLES OF COMPLEX PER MOLE OF AROMATIC HYDROCARBON COMPOUNDS EXTRACTED FROM SAID MIDDLE DISTILLATE, SAID COORDINATED COMPLEX BEING SELECTED FROM THE CLASS OF COMPLEXES COMPRISING NI(4-ETHYL PYRIDINE)2(4-VINYL PYRIDINE)2(SCN)2 AND NI(4-METHYL PYRIDINE)2(4-VINYL PYRIDINE)2(SCN)2, AND SEPARATING SAID MIDDLE DISTILLATE RAFFINATE FROM SAID PREDOMINANTLY BICYCLIC AROMATIC EXTRACT IN SAID COORDINATED COMPLEX.
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