US4209385A
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Method for reducing the nitrogen content of shale oil with a selective solvent comprising an organic acid and a mineral acid
Assignee: Occidental Research Corp
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Filing: 1979-06-27
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Granted: 1980-06-24
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Expires: 1999-06-27
Abstract
Abstract A method is disclosed for reducing the nitrogen content of shale oil by selectivity removing therefrom nitrogen-containing compounds. The nitrogen content of shale oil is reduced by contacting the shale oil with a sufficient amount of a solvent which is selective toward the nitrogen-containing compounds present in the shale oil. The solvent is a mixture comprised of an organic acid and a mineral acid. The organic acid is selected from the group consisting of organic acids, and substituted organic acids, particularly acetic, formic and trichloroacetic acids and mixtures thereof; the mineral acid is selected from the group consisting of hydrochloric acid, nitric acid, nitrous acid, sulfuric acid, sulfurous acid, phosphoric acid and mixtures thereof.
Inventors
- 👤 Carole S. Stover
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 15:43
CPC Classifications
C; C10; C10G; C10G21/00; C10G21/06
Claims Analysis
Total Claims: 17
Claim 1
Independent Claim
62 words
A method for reducing the nitrogen content of shale oil by removing nitrogen-containing compounds from shale oil, comprising the steps of: extracting the shale oil with an immiscible selective solvent system for the nitrogen-containing compounds comprising an organic acid and a mineral acid; and separating the immiscible selective solvent system containing nitrogen-containing compounds from the shale oil having a reduced nitrogen content.
Claim 2
Independent Claim
62 words
A method for reducing the nitrogen content of shale oil by removing nitrogen-containing compounds from shale oil, comprising the steps of: extracting the shale oil with an immiscible selective solvent system for the nitrogen-containing compounds comprising an organic acid and a mineral acid; and separating the immiscible selective solvent system containing nitrogen-containing compounds from the shale oil having a reduced nitrogen content.
Claim 3
Dependent Claim
27 words
A method as recited in claim 1 wherein the organic acid is selected from the group consisting of formic acid, acetic acid, trichloroacetic acid and mixtures thereof.
Claim 4
Dependent Claim
33 words
A method as recited in claim 1 wherein the mineral acid is selected from the group consisting of hydrochloric acid, nitric acid, nitrous acid, sulfuric acid, sulfurous acid, phosphoric acid and mixtures thereof.
Claim 5
Dependent Claim
29 words
A method as recited in claim 1 wherein the ratio of the organic acid to the mineral acid in the selective solvent is from about 1:5 to about 1:60.
Claim 6
Dependent Claim
18 words
A method as recited in claim 1 wherein the selective solvent contains less than about fifty percent water.
Claim 7
Dependent Claim
36 words
A method as recited in claim 1 wherein the ratio of shale oil to selective solvent system comprises from about 0.20 to about 10 parts by weight shale oil to one part by weight selective solvent.
Claim 8
Independent Claim
113 words
A method for reducing the nitrogen content of shale oil by removing nitrogen-containing compounds comprising the steps of: extracting the shale oil at least once with an immiscible selective solvent system for nitrogen-containing compounds comprising an organic acid selected from the group consisting of formic acid, acetic acid, trichloroacetic acid and mixtures thereof and a mineral acid selected from the group consisting of hydrochloric acid, nitric acid, nitrous acid, sulfuric acid, sulfurous acid, phosphoric acid and mixtures thereof; separating the selective solvent system containing the nitrogen-containing compounds from the shale oil having a reduced nitrogen content by phase separation; and recovering the selective solvent by separating the selective solvent from the nitrogen-containing compounds.
Claim 9
Independent Claim
113 words
A method for reducing the nitrogen content of shale oil by removing nitrogen-containing compounds comprising the steps of: extracting the shale oil at least once with an immiscible selective solvent system for nitrogen-containing compounds comprising an organic acid selected from the group consisting of formic acid, acetic acid, trichloroacetic acid and mixtures thereof and a mineral acid selected from the group consisting of hydrochloric acid, nitric acid, nitrous acid, sulfuric acid, sulfurous acid, phosphoric acid and mixtures thereof; separating the selective solvent system containing the nitrogen-containing compounds from the shale oil having a reduced nitrogen content by phase separation; and recovering the selective solvent by separating the selective solvent from the nitrogen-containing compounds.
Claim 10
Dependent Claim
24 words
A method as recited in claim 7 wherein the recovered selective solvent is recycled for extracting nitrogen-containing compounds from shale oil containing nitrogen-containing compounds.
Claim 11
Dependent Claim
20 words
A method as recited in claim 7 wherein the extraction is conducted batchwise in at least three successive batch extractions.
Claim 12
Dependent Claim
17 words
A method as recited in claim 7 wherein the extraction is conducted by a continuous countercurrent extraction.
Claim 13
Dependent Claim
20 words
A method as recited in claim 10 wherein the recovered selective solvent system is recycled for the continuous countercurrent extraction.
Claim 14
Dependent Claim
25 words
A method as recited in claim 7 wherein the organic acid is selected from the group consisting of formic acid, acetic acid and mixtures thereof.
Claim 15
Dependent Claim
25 words
A method as recited in claim 7 wherein the mineral acid is selected from the group consisting of hydrochloric acid, phosphoric acid and mixtures thereof.
Claim 16
Dependent Claim
21 words
A method as recited in claim 7 wherein the ratio of organic acid to mineral acid is from 1:5 to 1:60.
Claim 17
Dependent Claim
21 words
A method as recited in claim 7 wherein the ratio of organic acid to mineral acid is from 1:15 to 1:40.
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) | 1983-06-24 | 1983-12-24 | 1984-06-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1987-06-24 | 1987-12-24 | 1988-06-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1991-06-24 | 1991-12-24 | 1992-06-24 | $7700.00 | Window Closed / Lapsed |