Patent US4035287A successfully refreshed from Google Patents.
US4035287A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Desulfurization of residual oil
Assignee: Mobil Oil AS
•
Filing: 1975-08-25
•
Granted: 1977-07-12
•
Expires: 1995-08-25
Abstract
Abstract A method is provided for desulfurization of oil stock, e.g. residual oil, having a minimum sulfur content of about 2 weight percent and a minimum metals content of about 50 ppm to produce a low-sulfur, high-metals content raffinate and a high-sulfur, low-metals content extract which comprises contacting said oil stock with a solvent selective for low molecular weight aromatics and having a boiling point within the range of from about 0 DEG F to about 100 DEG F and a density greater than or less than the density of the oil stock being contacted by at least 0.1 g/cc, said contacting being conducted at a temperature of from about 60 DEG F to about 212 DEG F, a solvent/oil stock volume ratio of from about 0.25 to about 10 and a pressure higher than the vapor pressure of the solvent at the contacting temperature, and separating the low-sulfur, high-metals content raffinate from the high-sulfur, low-metals content extract.
Inventors
- 👤 Wilton F. Espenscheid
- 👤 Tsoung-Yuan Yan
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 04:32
CPC Classifications
C; C10; C10G; C10G21/00; C10G21/06; C10G21/08; C10G21/10
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
103 words
A method for desulfurization of an oil stock having a minimum sulfur content of about 2 weight percent and a minimum metals content of about 50 ppm to produce a low-sulfur, high-metals content raffinate and a high-sulfur, low-metals content extract which comprises contacting said oil stock with liquid sulfur dioxide solvent at a temperature of from about 60° F. to about 212° F., a solvent/oil stock volume ratio of from about 0.25 to about 10 and a pressure higher than the vapor pressure of the solvent at the contacting temperature, and separating the low-sulfur, high-metals content raffinate from the high-sulfur, low-metals content extract.
Claim 2
Independent Claim
103 words
A method for desulfurization of an oil stock having a minimum sulfur content of about 2 weight percent and a minimum metals content of about 50 ppm to produce a low-sulfur, high-metals content raffinate and a high-sulfur, low-metals content extract which comprises contacting said oil stock with liquid sulfur dioxide solvent at a temperature of from about 60° F. to about 212° F., a solvent/oil stock volume ratio of from about 0.25 to about 10 and a pressure higher than the vapor pressure of the solvent at the contacting temperature, and separating the low-sulfur, high-metals content raffinate from the high-sulfur, low-metals content extract.
Claim 3
Dependent Claim
35 words
The method of claim 1 wherein the contacting is conducted at a temperature of from about 70° F. to about 120° F. and a solvent/oil stock volume ratio of from about 0.5 to about 3.
Claim 4
Dependent Claim
27 words
The method of claim 1 wherein said oil stock is a residual oil having a total metals content of from about 50 ppm to about 150 ppm.
Claim 5
Dependent Claim
18 words
The method of claim 3 wherein said metals content is from about 50 ppm to about 100 ppm.
Claim 6
Dependent Claim
35 words
The method of claim 3 wherein the contacting is conducted at a temperature of from about 70° F. to about 120° F. and a solvent/oil stock volume ratio of from about 0.5 to about 3.
Claim 7
Dependent Claim
35 words
The method of claim 4 wherein the contacting is conducted at a temperature of from about 70° F. to about 120° F. and a solvent/oil stock volume ratio of from about 0.5 to about 3.
Claim 8
Dependent Claim
21 words
The method of claim 1 wherein said oil stock is a high boiling range residual oil boiling above about 600° F.
Claim 9
Dependent Claim
35 words
The method of claim 7 wherein the contacting is conducted at a temperature of from about 70° F. to about 120° F. and a solvent/oil stock volume ratio of from about 0.5 to about 3.
Claim 10
Dependent Claim
39 words
The method of claim 1 wherein said oil stock comprises at least a substantial part of one obtained by fractionation of a crude oil identified as Pennsylvania, Midcontinent, Gulf Coast, West Texas, Amal, Agha Jari, Kuwait, Barco or Arabian.
Claim 11
Dependent Claim
35 words
The method of claim 9 wherein the contacting is conducted at a temperature of from about 70° F. to about 120° F. and a solvent/oil stock volume ratio of from about 0.5 to about 3.
Claim 12
Dependent Claim
21 words
The method of claim 1 wherein said oil stock is one obtained by fractionation of crude oil identified as Agha Jari.
Claim 13
Dependent Claim
35 words
The method of claim 11 wherein the contacting is conducted at a temperature of from about 70° F. to about 120° F. and a solvent/oil stock volume ratio of from about 0.5 to about 3.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1980-07-11 | 1981-01-10 | 1981-07-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-07-11 | 1985-01-10 | 1985-07-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-07-11 | 1989-01-10 | 1989-07-12 | $7700.00 | Window Closed / Lapsed |