Patent US4592831A successfully refreshed from Google Patents.
US4592831A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Solvent for refining of residues
Assignee: Lummus Technology LLC
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Filing: 1984-12-12
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Granted: 1986-06-03
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Expires: 2004-12-12
Abstract
Abstract Solvent refining of a residual oil is accomplished with a refining solvent containing methanol and propanol, preferably isopropanol. The solvent produces high yields of a high quality refined oil, as well as a pumpable pitch fraction.
Inventors
- 👤 Andrei Rhoe
- 👤 Joseph A. Pisani
- 👤 Gary L. Hamilton
- 👤 George D. Suciu
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 11:54
CPC Classifications
C; C10; C10G; C10G21/00; C10G21/06; C10G21/12; C10G21/16; C10C; C10C3/00; C10C3/08; C10G21/003
Claims Analysis
Total Claims: 16
Claim 1
Independent Claim
62 words
A process for solvent refining of a residual oil, comprising: solvent refining the residual oil with a refining solvent to produce a refined oil and a pitch fraction, said refining solvent being a solvent which produces a pumpable pitch fraction at a temperature at which the solvent refining pressure does not exceed 150 psig, said refining solvent comprising methanol and a propanol.
Claim 2
Dependent Claim
62 words
A process for solvent refining of a residual oil, comprising: solvent refining the residual oil with a refining solvent to produce a refined oil and a pitch fraction, said refining solvent being a solvent which produces a pumpable pitch fraction at a temperature at which the solvent refining pressure does not exceed 150 psig, said refining solvent comprising methanol and a propanol.
Claim 3
Dependent Claim
17 words
The process of claim 1 wherein the ratio of methanol to propanol is from 1:10 to 1:1.
Claim 4
Dependent Claim
20 words
The process of claim 2 wherein the solvent refining is effected at a pressure of no greater than 100 psig.
Claim 5
Dependent Claim
28 words
The process of claim 3 wherein the solvent refining is effected with a solvent to residual oil feed ratio of at least 1:1 and no greater than 7:1.
Claim 6
Dependent Claim
14 words
The process of claim 1 wherein the residual oil feed is derived from petroleum.
Claim 7
Dependent Claim
10 words
The process of claim 1 wherein the propanol is isopropanol.
Claim 8
Dependent Claim
17 words
The process of claim 6 wherein the ratio of methanol to isopropanol is from 1:10 to 1:1.
Claim 9
Dependent Claim
20 words
The process of claim 7 wherein the solvent refining is effected at a pressure of no greater than 100 psig.
Claim 10
Dependent Claim
14 words
The process of claim 7 wherein the residual oil feed is derived from petroleum.
Claim 11
Dependent Claim
37 words
A process for solvent refining a residual oil, comprising: solvent refining a residual oil with a refining solvent to produce a refined oil and a pumpable pitch fraction, said refining solvent consisting essentially of methanol and isopropanol.
Claim 12
Dependent Claim
37 words
A process for solvent refining a residual oil, comprising: solvent refining a residual oil with a refining solvent to produce a refined oil and a pumpable pitch fraction, said refining solvent consisting essentially of methanol and isopropanol.
Claim 13
Dependent Claim
20 words
The process of claim 10 wherein the solvent refining is effected at a pressure which does not exceed 100 psig.
Claim 14
Dependent Claim
17 words
The process of claim 11 wherein the ratio of methanol to isopropanol is from 1:10 to 1:1.
Claim 15
Dependent Claim
27 words
The process of claim 12 wherein the solvent refining effected with a solvent to residual oil feed ratio of at least 1:1 and no greater than 7:1.
Claim 16
Dependent Claim
14 words
The process of claim 13 wherein the residual oil feed is derived from petroleum.
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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) | 1989-06-02 | 1989-12-02 | 1990-06-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1993-06-02 | 1993-12-02 | 1994-06-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1997-06-02 | 1997-12-02 | 1998-06-03 | $7700.00 | Window Closed / Lapsed |