| 摘要 |
A process for separating aromatic and nonaromatic hydrocarbons which comprises a continuous solvent extraction - solvent decantation process. The process is particularly well-suited for a hydrocarbon feed comprising hydrocarbon mineral oils as a nonaromatic component wherein the process provides improved stability of said hydrocarbon mineral oils, normally suceptible to thermal degradation and oxidation and, further, decreases the tendancy of such oils to form sludge. The process involves: (a) contacting (24) such hydrocarbon feed (10) with an aromatic selective solvent (57) to provide an aromatic-rich solvent phase (28) and a raffinate phase (26), (b) cooling (30, 32) the aromatic-rich solvent phase (28) to bring about the formation of two phases; (c) introducing the phase of the cooled aromatic-rich solvent phase (28) to a decantation zone (34) with an anti-solvent (44) for aromatic hydrocarbon in said aromatic selective solvent to provide an aromatic-rich extract phase (36) and a solvent phase (48) (d) removing anti-solvent (54) from said solvent phase (48) and recycling said solvent phase (57) to the extraction zone (24); and (e) recovering the aromatic-rich extract (40) of step (c) and the raffinate (66) of step (a). |
