Patent ID: 11866654
Assignee: SAUDI ARABIAN OIL COMPANY
Field: Chemical engineering (Chemistry)
Classification: CPC C  B | IPC B  C

Claim 8:
9. A system for producing a diesel having improved cold flow properties, the system comprising:
a distillation column, the distillation column configured to separate a crude oil to produce a light fraction stream, a light gas oil, a light vacuum gas oil, a heavy vacuum gas oil, and a vacuum residue stream, where the light fraction stream has a T95% cut point of less than 240 deg C, where the light gas oil has a T95% cut point in the range between 300 deg C. and 340 deg C, where the light vacuum gas oil has a T95% cut point in the range between 400 deg C. and 430 deg C, where the heavy vacuum gas oil has a T95% cut point of greater than 560 deg C;
a gas oil hydrodesulfurization unit fluidly connected to the distillation column, the gas oil hydrodesulfurization unit configured to process the light gas oil to produce a desulfurized light gas oil, where the gas oil hydrodesulfurization unit operates at a temperature in the range between 300 deg C. and 420 deg C, where the gas oil hydrodesulfurization unit operates at a pressure between 100 psig and 1050 psig, where the gas oil hydrodesulfurization unit operates at a liquid hourly space velocity between 0.5 h−1 and 6 h−1, where the gas oil hydrodesulfurization unit comprises a hydrodesulfurization catalyst, where the desulfurized light gas oil comprises less than 10 ppm wt sulfur;
a supercritical upgrading unit fluidly connected to the distillation column, the supercritical upgrading unit configured to process the light vacuum gas oil to produce an upgraded vacuum gas oil;
an upgrading hydrodesulfurization unit fluidly connected to the supercritical upgrading unit, the upgrading hydrodesulfurization unit configured to process the upgraded vacuum gas oil to produce a desulfurized vacuum gas oil, where the upgrading hydrodesulfurization unit operates at a temperature in the range between 300 deg C. and 420 deg C, where the upgrading hydrodesulfurization unit operates at a pressure between 100 psig and 1050 psig, where the upgrading hydrodesulfurization unit operates at a liquid hourly space velocity between 0.5 h−1 and 6 h−1, where the upgrading hydrodesulfurization unit comprises a hydrodesulfurization catalyst;
a fractionator fluidly connected to the upgrading hydrodesulfurization unit, the fractionator configured to separate the desulfurized vacuum gas oil to produce an upgraded light fraction, an upgraded light gas oil, and upgraded heavy fraction;
a resid upgrading unit fluidly connected to the distillation column, the resid upgrading unit configured to upgrade a mixed heavy stream to produce a resid upgraded product, where the mixed heavy stream is a mix of the heavy vacuum gas oil and the vacuum residue stream;
a diesel pool fluidly connected to the gas oil hydrodesulfurization unit and the fractionator, the diesel pool configured to blend the upgraded light gas oil and the desulfurized light gas oil, where the diesel pool comprises diesel; and
a naphtha and kerosene pool fluidly connected to the distillation column and the fractionator, the naphtha and kerosene pool configured to receive a mixture of the light fraction stream and the upgraded light fraction.