| 摘要 |
A base oil slate prepared from a waxy feed, comprises 3 or more base oil grades, each base oil grade having a kinematic viscosity at 100 degrees C between 1.8 cSt and 30 cSt and a VI greater than an amount defined by the equation VI=Ln(Vis100)+95, wherein Ln(Vis100)is the natural log of the viscosity at 100 degrees C. A process for producing the product slate, which includes at least three base oil grades having kinematic viscosities at 100°C within the range between 1.8 cSt and 30 cSt, from a waxy feed having an initial boiling point of 340°C or less and a final boiling point of 560 °C or higher, comprises: (a) isomerizing at least a portion of the waxy feed, whereby the amount of isoparaffins present are increased; (b) distilling a first portion of the isomerized waxy feed in a light block mode operation into at least three base oil fractions having different boiling ranges; (c) distilling a second portion of the isomerized waxy feed in a medium block mode operation into at least three base oil fractions having different boiling ranges; and (d) blending at least one base oil fraction produced from the light block mode with at least one base oil fraction produced from the medium block mode to produce a lubricating base oil blend meeting a target value for at least one pre-selected property. |
