Method for making middle distillates and a heavy vacuum gas oil FCC feedstock

Patent metadata

Field	Value
Publication number	US-9803147-B2
Application number	US-201414541874-A
Country	US
Kind code	B2
Filing date	Nov 14, 2014
Priority date	Nov 19, 2013
Publication date	Oct 31, 2017
Grant date	Oct 31, 2017

Abstract

The present invention is directed to a refining process for producing hydroprocessed distillates and a heavy vacuum gas oil (HVGO). The process produces middle distillates that have reduced nitrogen and sulfur content, while simultaneously producing a 900° F. + (482° C. + ) HVGO stream useful as a fluidized catalytic cracking (FCC) unit feedstock.

First claim

What is claimed is:

1. A process for making at least one middle distillate and a heavy vacuum gas fluidized catalytic cracking feedstock, comprising:
hydrocracking a hydrocarbonaceous feedstock at a 20 to 30% conversion rate to produce a first stage hydrocracked effluent;
distilling the hydrocracked feedstock by atmospheric distillation in an atmospheric distillation unit to form at least one middle distillate fraction and an atmospheric bottoms fraction;
further distilling the atmospheric bottoms fraction by vacuum distillation in a vacuum distillation unit to form a side-cut vacuum gas oil fraction and a heavy vacuum gas oil fluidized catalytic cracking (FCC) feedstock;
passing the side-cut vacuum gas oil fraction directly to a second stage hydrocracker and hydrocracking the side-cut vacuum gas oil fraction to form a second stage hydrocracked effluent;
passing the heavy vacuum gas oil FCC feedstock directly to an FCC unit; and
combining the second stage hydrocracked effluent with the first stage hydrocracked effluent.

2. The process of claim 1 , wherein the hydrocarbonaceous feedstock is hydrotreated to produce a hydrotreated hydrocarbonaceous feedstock, followed by hydrocracking the hydrotreated hydrocarbonaceous feedstock to produce the first stage hydrocracked effluent.

3. The process of claim 2 , wherein the hydrotreating of the hydrocarbonaceous feedstock is conducted at a 25 to 30% conversion rate.

4. The process of claim 1 , wherein the hydrocarbonaceous feedstock comprises an API gravity of 13.5 to 17, a nitrogen content of 4,000 to 7,000 ppm, a sulfur content of 2.5 to 4.5 weight percent, and a polycyclic index of 7,000 to 11,000.

5. The process of claim 1 , wherein the side-cut vacuum distillation fraction has a cut-point of 900° F. (482° C.) to 1,000° F. (538° C.).

6. The process of claim 5 , wherein the side-cut vacuum distillation fraction has a API gravity of 30 to 34, a nitrogen content of 1 to 3 ppm, and a sulfur content of 10 to 100 ppm.

7. The process of claim 6 , wherein the heavy vacuum gas oil feedstock has an API gravity of 25 to 29, a nitrogen content of 10 to 150 ppm, and a sulfur content of 100 to 1,000 ppm.

8. The process of claim 1 , wherein the heavy vacuum gas oil feedstock has an API gravity of 25 to 29, a nitrogen content of 10 to 150 ppm, and a sulfur content of 100 to 1,000 ppm.

9. The process of claim 1 , wherein the step of hydrocracking the side-cut vacuum gas oil fraction is conducted at a 60 to 80% conversion rate.

10. The process of claim 1 , wherein the step of hydrocracking the side-cut vacuum gas oil fraction is conducted at a 60 to 80% conversion rate.

11. The process of claim 1 , wherein the heavy vacuum gas oil FCC feedstock to the FCC unit is a 900° F. (482° C.) or greater feedstream.

12. The process of claim 1 , wherein the combined second stage hydrocracked effluent and first stage hydrocracked effluent is passed directly to the atmospheric distillation unit.

13. The process of claim 1 , wherein the atmospheric bottoms fraction is passed directly to the vacuum distillation unit.

Assignees

• Bhattacharya Subhasis
• Mukherjee Ujjal Kumar
• Greene Marvin I
• Chevron Usa Inc

Inventors

• Bhattacharya Subhasis
• Mukherjee Ujjal Kumar
• Greene Marvin I

Classifications

• C10G69/00

  Treatment of hydrocarbon oils by at least one hydrotreatment process and at least one other conversion process (C10G67/00 takes precedence) · CPC title

• C10G65/12 Primary

  including cracking steps and other hydrotreatment steps · CPC title

• C10G65/10

  including only cracking steps · CPC title