US4452690A
Expired / Lapsed
US
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Petroleum residual visbreaking through molecular grafting
Assignee: Mobil Oil AS
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Filing: 1982-06-21
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Granted: 1984-06-05
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Expires: 2002-06-21
Abstract
Abstract Chemical methods for diminishing the viscosity of petroleum residuals are disclosed. According to a preferred embodiment, residuals and olefins are coreacted employing a peroxide and a silver salt at a temperature between the pour point of the residual and about 350 DEG C.
Inventors
- 👤 Stuart S. Shih
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 09:02
CPC Classifications
C; C10; C10G; C10G29/00; C10G29/20; C10G29/205; C10G2300/00; C10G2300/10; C10G2300/107
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
43 words
A method for improving the properties of a petroleum residual comprising reacting said residual at a temperature above the pour point of said residual but below 350° C. with added olefin in the presence of a catalyst comprising a free radical generating species.
Claim 2
Independent Claim
43 words
A method for improving the properties of a petroleum residual comprising reacting said residual at a temperature above the pour point of said residual but below 350° C. with added olefin in the presence of a catalyst comprising a free radical generating species.
Claim 3
Dependent Claim
13 words
The method of claim 1 wherein said catalyst also contains a metal salt.
Claim 4
Dependent Claim
18 words
The method of claim 2 wherein said free radical generating species is ionizing radiation or an organic peroxide.
Claim 5
Dependent Claim
25 words
The method of claim 3 wherein said organic peroxide is selected from the group consisting of t-butyl peroxide, benzoyl peroxide, diisobutyl peroxide and dicumyl peroxide.
Claim 6
Dependent Claim
13 words
The method of claim 2 wherein said metal salt is a silver salt.
Claim 7
Dependent Claim
21 words
The method of claim 1 wherein said olefin is a primary or secondary aliphatic olefin containing 2 to 20 carbon atoms.
Claim 8
Dependent Claim
22 words
The method of claim 6 wherein the olefin is selected from the group consisting of propene, butene, isobutene, 1-octene, 1-decene and 1-dodecene.
Claim 9
Dependent Claim
17 words
The method of claim 1 wherein the temperature is from about 75° C. to about 250° C.
Claim 10
Dependent Claim
30 words
The method of claim 1 wherein sufficient olefin is reacted to result in a weight gain based on the weight of the residual of from about 2% to about 6%.
Claim 11
Dependent Claim
29 words
The method of claim 2 wherein the residual is a heavy vacuum residual, the olefin is 1-octene, the catalyst is t-butyl peroxide and the silver salt is silver nitrate.
Claim 12
Dependent Claim
29 words
The method of claim 2 wherein the residual is a heavy vacuum residual, the olefin is 1-dodecene, the catalyst is t-butyl peroxide and the silver salt is silver nitrate.
Claim 13
Dependent Claim
30 words
The method of claim 2 wherein the residual is a heavy vacuum residual, the olefin is methyl styrene, the catalyst is t-butyl peroxide and the silver salt is silver nitrate.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1987-06-05 | 1987-12-05 | 1988-06-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1991-06-05 | 1991-12-05 | 1992-06-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1995-06-05 | 1995-12-05 | 1996-06-05 | $7700.00 | Window Closed / Lapsed |