Process to manufacture a base stock

Patent metadata

Field	Value
Publication number	US-9732287-B2
Application number	US-201414222829-A
Country	US
Kind code	B2
Filing date	Mar 24, 2014
Priority date	Oct 1, 2008
Publication date	Aug 15, 2017
Grant date	Aug 15, 2017

Abstract

We provide a process to manufacture a base stock, comprising hydrocracking, separating, and dewaxing, wherein the base stock has a ratio of Noack volatility to CCS VIS at −25° C. multiplied by 100 from 0.15 to 0.40. We also provide a base stock made by a process, and a base oil manufacturing plant that produces the base stock.

First claim

What is claimed is:

1. A process to manufacture a base stock, comprising:
a. hydrocracking a heavy hydrocarbon feedstock in a hydrocracking zone, wherein the operating conditions in the hydrocracking zone are selected to convert vacuum gas oil to a product slate containing greater than 20 wt % of a waxy intermediate fraction;
b. separating the waxy intermediate fraction into a lower boiling fraction and a higher boiling fraction;
c. dewaxing the higher boiling fraction under conditions whereby the dewaxed higher boiling fraction has:
i. a first boiling range from 730 to 1000° F. (388 to 538° C.),
ii. a first VI from 105 to 120,
iii. a first CCS VIS at −25° C. from 2500 to 4500 mPa·s, and
iv. a ratio of a first Noack volatility to the first CCS VIS at −25° C. multiplied by 100 from 0.15 to 0.40; and

d. dewaxing the lower boiling fraction under conditions whereby the dewaxed lower boiling fraction has:
i. an additional boiling range from 700 to 925° F. (371 to 496° C.),
ii. an additional VI from 105 to 115,
iii. an additional Noack volatility less than 18 wt %, and
iv. a ratio of the additional Noack volatility to an additional CC VIS at −25° C. multiplied by 100 from 0.80 to 1.55, and
wherein the dewaxing is hydroisomerization dewaxing which is performed at a total pressure of between about 2000 to 3000 psig.

2. The process of claim 1 , wherein the higher boiling fraction is a bottoms fraction.

Assignees

• Chevron Usa Inc

Inventors

• Rosenbaum John Michael
• Lok Brent K
• Helling Kathy A
• Lee Steven K
• Schexnaydre Ryan Joseph

Classifications

• C10M2203/003

  used as base material · CPC title

• C10N2020/015

  Distillation range · CPC title

• C10G67/0409

  Extraction of unsaturated hydrocarbons · CPC title

• C10M171/02

  Specified values of viscosity or viscosity index · CPC title

• C10N2030/74

  Noack Volatility · CPC title