Патент USA US2132350код для вставки
Patented Oct. 4, 1938 2,132,350 ' UNITED STATES PATT FFIQE 2,132,350 SOLVENT‘ REFINING OF HYDROCARBON OIL Louis A. Clarke, Fishkill, N. Y., assignor to The Texas Company, New York, N, Y., a corpora tion of Delaware No Drawing.’ Application June 5, 1937, Serial No. 146,587 2 Claims. (Cl. 196-43) This invention relates to re?ning hydrocarbon tively high yield of ra?inate was obtained, namely, oil, and more particularly to re?ning mineral oil 88%, having a viscosity index of 70, as compared by solvent extraction. with a viscosity index of 5'7 for the original dis The invention contemplates the solvent ex tillate. 5 traction of hydrocarbon oil with a selective solvent Oil of still higher viscosity index, of course, can 5 comprising resorcinol monoacetate to separate the be obtained by altering the solvent proportions oil into fractions having different characteristics. ' and the extraction temperature, in which case a I have discovered that resorcinol monoacetate somewhat lower yield of raf?nate, corresponding is particularly suitable as a solvent re?ning agent .to the higher viscosity index, would be obtained. 10 for mineral oil, and especially for the re?ning of lubricating oil fractions derived from petroleum. I have also discovered that this solvent, when used for treating mineral lubricating oil, permits obtaining a high yield of high viscosity index oil It is, therefore, contemplated that extraction temperatures, either below or above that' speci ?ed above, may be used. Likewise, the solvent dosage may be varied as, for example, from one 15 having a good color as well as other desirable to four parts of solvent to one of oil. These factors can be varied, depending upon the nature characteristics. In this respect, it is superior to many of the known selective solvents; that is, it is possible to obtain high viscosity index oil the degree of extraction desired. While a distillate oil has been referred to above of good color without substantially sacri?cing‘ the 20 yield. - ' Treatment of the oil with the solvent may be effected by stage or continuous countercurrent contact. In either case, the mixture of oil and solvent is separated into extract and ra?inate phases. The extract phase comprises the so 2Ol called naphthenic or low viscosity index con stituents of the oil dissolved in the main body of the solvent, While the raffinate phase comprises the so-called para?inic or high viscosity index constituents of the oil mixed with a small portion 30 of the solvent. The two phases are separated, and the solvent removed therefrom by distillation or by some other means, for example, washing or displacing 35 the solvent from the oil by contact with some other liquid or solvent. As a speci?c example, a lubricating oil dis tillate obtained from Mid-Continent crude, and having the tests indicated below was extracted of the oil undergoing treatment as well as upon in the speci?c example, it is, of course, contem plated that residual fractions may also be treated with the solvent. The solvent is also useful in the extractive treatment of other petroleum frac tions as, for example, naphtha, kerosene, etc. When treating lubricating oil stock, the oil may be diluted with a suitable diluent such as a low boiling petroleum hydrocarbon, and the dilute 25 mixture subjected to extraction with the solvent. Obviously, many modi?cations and variations of the invention, as hereinbefore set forth, may be made without departing from the spirit and should be imposed as are indicated in the ap pended claims. I claim: 1. In the re?ning of hydrocarbon oil containing 35 relatively para?'inic and relatively non-para?inic constituents to separate the oil into fractions re- 4 spectively rich in paraihnic and non-para?inic constituents, the method which comprises mixing 40 with resorcinol monoacetate, using three parts of the oil with a selective solvent comprising res solventto one part of distillate, and at a tempera ture of about 237° F. The mixture was separated into extract and ra?inate phases, and the ra?inate phase, upon removal of the solvent liquid, com 4.5 prised about 88% by volume of the original dis orcinol monoacetate, forming an- extract phase tillate. ' The tests on the distillate before extraction, and on the resulting ra?inate oil, were as follows: 50 Distillate Raf?nate 0 scope thereof, and therefore only such limitations containing non-parai?nic constituents dissolved in the solvent and a ra?inate phase comprising para?inic constituents of the oil, and separating the two phases. 45 2. The method of treating mineral lubricating oil containing relatively para?inc and relatively non-parai?nic constituents to separate the oil into fractions respectively rich in paraffinic and non para?‘lnic constituents comprising mixing the oil 50 with a selective solvent comprising r-esorcinol ' _ monoacetate, forming an extract phase contain ing non-paraffinic constituents dissolved in the S. U. viscosity at 210° F._ _ solvent and a ra?inate phase comprising paraf?nic Viscosity index __________ ._ _ Gravity, A. I’. I ________________________ _. Color Tag. Rob __________ __ 21. 7 S. U. viscosity at 100° F____ 55 Viscosity gravity constant. . _ _ From the foregoing, it is observed that a rela _ constituents of the oil, and separating the two 55 phases. ' LOUIS A. CLARKE‘.