| 摘要 |
PROBLEM TO BE SOLVED: To provide a method that is improved in economical efficiency of production of a raw material for preparing a high-grade lubricating base oil. SOLUTION: The method for producing a raw material for preparing a high-grade lubricating base oil comprises a stage to supply a hydrogen treating unit (HDT) with a vacuum gas oil (VGO) prepared by distillation of an atmospheric distillation residue (AR) using a first vacuum distillation unit (V1), a stage to remove impurities from the vacuum gas oil through the HDT, a stage to prepare light and heavy hydrocarbons using a first hydrocracking unit (HDC1), a stage to supply the hydrocarbons to a fractional still (Fs) and to separate the same into an oil product and an unconverted oil, a stage to supply a part of the unconverted oil to a second vacuum distillation unit (V2), a stage to prepare the raw material of a high-grade lubricating base oil having a prescribed viscosity grade and a remaining amount of the unconverted oil, a stage to supply a second hydrocracking unit (HDC2) with a residual unconverted oil separated by the Fs and with an unconverted oil prepared by the V2, and a stage to recycle the prepared light and heavy hydrocarbons prepared by the HDC2 to the Fs. COPYRIGHT: (C)2009,JPO&INPIT |
