Patent ID: 6248929
Filing Date: 2001-06-19
Classification: B01D,C10G

Abstract:
A method for producing rubber process oil, comprising the steps of:preparing a raw material oil which is selected from the group consisting of: a lube oil distillate from crude oil by vacuum distillation and deasphalted oil obtained from vacuum residue;subjecting the raw material oil to extraction at a temperature of 60.degree. C. or higher than 60.degree. C. with a solvent having selective affinity for aromatic hydrocarbons, wherein the ratio of the solvent to the raw material oil is in a range of 1/1 to 4/1 by volume, to obtain a first raffinate and a mixture of a first extract and the solvent with a yield of first extract to raw material oil of 55 vol % or less;cooling the mixture of the first extract and the solvent to separate into a second raffinate and a mixture of a second extract and the solvent under cooling conditions that result in a yield of second raffinate to the first extract of 90 vol % or less, so that the content of polycyclic aromatics in the second raffinate is less than 3% by mass as determined by the IP 346 method; and,preparing the rubber process oil from the second raffinate.