| 摘要 |
<p>The separation of aromatic and nonaromatic containing hydrocarbon feeds is provided by use of an extraction-separation process using mixed extraction solvents. The term "mixed extraction solvent" as used herein shall mean a solvent mixture comprising a "solvent" component and a "cosolvent" component, as hereinafter defined. The "solvents" component employed in the instant process are the low molecular weight polyalkylene glycols of the formula: HO-[CHR1-(CR2R3)n-O]m-H wherein n is an integer from 1 to 5 and is preferably the integer 1 or 2; m is an integer having a value of 1 or greater, preferably between about 2 to about 20 and most preferably between about 3 and about 8; and wherein R1, R2 and R3 may be hydrogen, alkyl, aryl, araalkyl or alkylaryl and are preferably hydrogen and alkyl having between 1 and about 10 carbon atoms and most preferably are hydrogen. The "cosolvent" component employed herein is a glycol ether of the formula R4O-[CHR5-(CHR6-)-xO]y-R7 wherein R4, R5, R6 and R7 may be hydrogen alkyl, aryl, aralkyl, alkylaryl and mixtures thereof with the proviso that R4 or R7 are not both hydrogen.</p> |
