Abstract: The separation of aromatic and nonaromatic containing hydrocarbon feeds is provided by use of an extraction-separation process using extraction solvents.

Abstract: 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--[CHR.sub.1 --(CR.sub.2 R.sub.3).sub.n --O].sub.m --Hwherein 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 R.sub.1, R.sub.2 and R.sub.3 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 formulaR.sub.4 O--[CHR.sub.5 --(CHR.

Abstract: An improvement to a continuous solvent extraction-steam distillation process for the recovery of aromatic hydrocarbons in the range of C.sub.6 -C.sub.16 from a feed stream containing such aromatics and aliphatic hydrocarbons in the range of C.sub.5 -C.sub.16 which resides in utilizing two heat exchangers wherein the heat of condensation of the overhead stripper vapor and vapor sidedraw products is recovered and utilized to vaporize the stripping water, thereby producing stripping steam which in turn is compressed up to the pressure present at the bottom of the stripper and resulting in the reduction of the heat load of the process.

Abstract: An improvement to a continuous solvent extraction-steam-distillation process for the recovery of aromatic hydrocarbons in the range of C.sub.6 -C.sub.16 from a feed stream containing such aromatics and aliphatic hydrocarbons in the range of C.sub.5 -C.sub.16 which resides in using two extractive distillation zones thermally linked to recover heat and solvent, thereby resulting in a heat savings.

Abstract: A liquid-liquid contacting tray comprising a perforated deck providing a major portion of the tray surface area and continuous phase liquid transfer means comprising a settling section extending outwardly from the tray deck on one side of the tray and joined in closed flow communication with a smaller cross-sectioned pressure drop section extending outwardly from the tray deck on the other side of the tray to provide a sudden contraction in cross-sectional area from the settling section to said pressure drop section substantially in the plane of the perforated deck for reduction of pressure in the liquid flowed therethrough.