Method for producing feedstocks of high quality lube base oil from coking gas oil

Abstract

Disclosed herein is a method of producing feedstock of high-quality lube based oil by producing coker gas oil (CGO) from vacuum residue (VR) or a mixture (VR/AR) of atmospheric residue (AR) and vacuum residue (VR), performing a hydrotreating process and a hydrocracking process by mixing the coker gas oil (CGO) with vacuum gas oil (VGO) to form unconverted oil (UCO), and then recycling the unconverted oil. The method of producing feedstock of high-quality lube based oil is advantageous in that feedstock of high-quality lube based oil can be more economically and efficiently produced using cheap coker gas oil (CGO), which is hard to treat.

1 - 5 . (canceled) 
   
   
       6 . A method of producing feedstock of high-quality lube base oil using coker gas oil (CGO), comprising:
 distilling atmospheric residue (AR) in a first vacuum distillation unit (V 1 ) and thus separating the distilled atmospheric residue (AR) into vacuum gas oil (VGO) and vacuum residue (VR) or a mixture (VR/AR) of atmospheric residue (AR) and vacuum residue (VR), and then supplying the vacuum gas oil (VGO) directly to a hydrotreating unit (HDT) and supplying the vacuum residue (VR) or the mixture (VR/AR) of atmospheric residue (AR) and vacuum residue (VR) to a first fractional distillation unit (Fs 1 );   supplying the vacuum residue (VR) or the mixture (VR/AR) of atmospheric residue (AR) and vacuum residue (VR), from which fuel components are separated in the first fractional distillation unit (Fs 1 ), into a coker drum and then coking it in the coker drum, and then obtaining coker gas oil (CGO) again through the first fractional distillation unit (Fs 1 ), and then supplying the obtained coker gas oil (CGO) into the hydrotreating unit (HDT) together with the vacuum gas oil (VGO);   removing impurities from the coker gas oil (CGO) and vacuum gas oil (VGO) through the hydrotreating unit (HDT);   obtaining light and heavy hydrocarbons through a hydrocracking unit (HDC);   supplying the light and heavy hydrocarbons into a second fractional distillation unit (Fs 2 ) to separate them into oil products and unconverted oil;   supplying all of the separated unconverted oil into a second vacuum distillation unit (V 2 ) to obtain feedstock of high-quality lube base oil having a predetermined viscosity grade and balanced unconverted oil; and   recycling the unconverted oil obtained from the second vacuum distillation unit (V 2 ) into the hydrocracking unit (HDC).   
   
   
       7 . The method of producing feedstock of high-quality lube base oil according to  claim 6 , wherein a mixing volume ratio (VGO/CGO) of the vacuum gas oil (VGO) to coker gas oil (CGO), supplied into the hydrotreating unit (HDT), is  3 ˜ 9 . 
   
   
       8 . The method of producing feedstock of high-quality lube base oil according to  claim 6 , wherein a ratio of the unconverted oil separated through the second fractional distillation unit (Fs 2 ) to the unconverted oil recycled into the hydrocracking unit (HDC) is 3:1˜5:1. 
   
   
       9 . The method of producing feedstock of high-quality lube base oil according to  claim 6 , wherein a ratio of the unconverted oil supplied into the second vacuum distillation unit (V 2 ) to the unconverted oil recycled from the second vacuum distillation unit (V 2 ) into the hydrocracking unit (HDC) is 1.3:1˜1.5:1. 
   
   
       10 . A method of producing feedstock of high-quality lube base oil using coker gas oil (CGO), comprising:
 distilling atmospheric residue (AR) in a first vacuum distillation unit (V 1 ) and thus separating the distilled atmospheric residue (AR) into vacuum gas oil (VGO) and vacuum residue (VR) or a mixture (VR/AR) of atmospheric residue (AR) and vacuum residue (VR), and then supplying the vacuum gas oil (VGO) directly to a hydrotreating unit (HDT) and supplying the vacuum residue (VR) or the mixture (VR/AR) of atmospheric residue (AR) and vacuum residue (VR) to a first fractional distillation unit (Fs 1 );   supplying the vacuum residue (VR) or the mixture (VR/AR) of atmospheric residue (AR) and vacuum residue (VR), from which fuel components are separated in the first fractional distillation unit (Fs 1 ), into a coker drum and then coking it in the coker drum, and then obtaining coker gas oil (CGO) again through the first fractional distillation unit (Fs 1 ), and then supplying the obtained coker gas oil (CGO) into the hydrotreating unit (HDT) together with the vacuum gas oil (VGO);   removing impurities from the coker gas oil (CGO) and vacuum gas oil (VGO) through the hydrotreating unit (HDT);   obtaining light and heavy hydrocarbons through a hydrocracking unit (HDC);   supplying the light and heavy hydrocarbons into a second fractional distillation unit (Fs 2 ) to separate them into oil products and unconverted oil;   supplying a part of the separated unconverted oil into a second vacuum distillation unit (V 2 ) to obtain feedstock of high-quality lube base oil having a predetermined viscosity grade and balanced unconverted oil; and   recycling the unconverted oil separated through the second fractional distillation unit (Fs 2 ) and the unconverted oil obtained from the second vacuum distillation unit (V 2 ) into the hydrocracking unit (HDC).   
   
   
       11 . The method of producing feedstock of high-quality lube base oil according to  claim 10 , wherein a mixing volume ratio (VGO/CGO) of the vacuum gas oil (VGO) to coker gas oil (CGO), supplied into the hydrotreating unit (HDT), is  3 ˜ 9 . 
   
   
       12 . The method of producing feedstock of high-quality lube base oil according to  claim 10 , wherein a ratio of the unconverted oil separated through the second fractional distillation unit (Fs 2 ) to the unconverted oil recycled into the hydrocracking unit (HDC) is 3:1˜5:1. 
   
   
       13 . The method of producing feedstock of high-quality lube base oil according to  claim 10 , wherein a ratio of the unconverted oil supplied into the second vacuum distillation unit (V 2 ) to the unconverted oil recycled from the second vacuum distillation unit (V 2 ) into the hydrocracking unit (HDC) is 1.3:1˜1.5:1.