| 摘要 |
<p>There is disclosed 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 feed comprising hydrocarbon mineral oils as the nonaromatic component wherein the process by removing aromatics provides improved stability in said hydrocarbon mineral oils, normally susceptible to thermal degradation and oxidation and, further, decreases the tendency of the oil to form sludge. The process involves: (a) contacting the feed (10) in an extraction zone (16) with an aromatic selective solvent (18b) at a temperature of at least about 150 DEG C to form an aromatic-rich solvent phase (24) containing primarily aromatic hydrocarbons and a raffinate (20) containing primarily nonaromatic hydrocarbons; (b) cooling (26,28) the aromatic-rich solvent phase (24) to bring about the formation of two phases; (c) introducing said cooled aromatic-rich solvent phase (24b) to a decantation zone (30) to provide an aromatic-rich extract (32) containing primarily aromatic hydrocarbons and a solvent phase (18) containing primarily aromatic selective solvent; (d) recycling said solvent phase (18b) to the extraction zone (16) of step (a), preferably, after solvent purification; and (e) recovering the aromatic-rich extract (32) of step (c) and the raffinate (21) of step (a).</p> |
