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Selective solvent extraction process in the gas-oil range

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  • 4. A PROCESS OF OBTAINING AN EXTRACT RICH IN AROMATICS FROM A MIXTURE OF AROMATIC AND NON-AROMATIC HYDROCARBONS IN THE GAS-OIL BOILING RANGE COMPRISING EXTRACTING SAID HYDROCARBON MIXTURE HAVING A FIRST BOILING RANGE WITH BETA-PROPIOLACTONE AS THE SELECTIVE SOLVENT TO FORM AN EXTRACT RICH IN THE AROMATICS IN THE GAS-OIL BOILING RANGE, EXTRACTING THE RESULTANT AROMATIC-RICH SOLVENT PHASE BY ADDING A MIXTURE OF AROMATIC AND NON-AROMATIC HYDROCARBONS IN A SECOND BOILING RANGE DIFFERENT FROM BOILING RANGE OF SAID GAS-OIL HYDROCARBON MIXTURE TO THEREBY REPLACE THE AROMATICS OF THE GAS-OIL RANGE DISSOLVED IN THE SOLVENT, AND THEN DISTILLING THE RESULTANT MIXTURE CONTAINING AROMATICS FROM THE GAS-OIL RANGE MIXTURE AND THE NONAROMATICS FROM THE DIFFERENT BOILING RANGE MIXTURE TO THEREBY RECOVER THE GAS-OIL AROMATICS.
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