US4548701A
Expired / Lapsed
US
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Method for extraction solvent recovery
Assignee: BP Corp North America Inc
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Filing: 1983-12-19
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Granted: 1985-10-22
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Expires: 2003-12-19
Abstract
Abstract A method for recovery of extraction solvent from a dissolved solute wherein halogen gas evolution and halogen compound retention in the solute are minimized comprises heating a solution of a halogenated organic solvent and the extracted solute in the presence of an ammonium, Group I metal or Group II metal salt of an acid of carbon number 1 to 6, such as ammonium bicarbonate, ammonium carbonate, ammonium formate, sodium carbonate, sodium formate, or calcium formate, to recover the solvent and the solute.
Inventors
- 👤 William F. Wolff
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 03:14
CPC Classifications
C; C10; C10G; C10G1/00; C10G1/04
Claims Analysis
Total Claims: 36
Claim 1
Independent Claim
67 words
A method for solvent recovery of extraction solvents from a solute comprising: stripping a halogenated organic solvent from solute in the presence of an ammonium, Group I metal, or Group II metal salt of an acid having a carbon number of 1 to 6 to evaporate the solvent and recover the solute and the solvent, wherein decomposition of the solvent and halogenation of the solute are minimized.
Claim 2
Independent Claim
67 words
A method for solvent recovery of extraction solvents from a solute comprising: stripping a halogenated organic solvent from solute in the presence of an ammonium, Group I metal, or Group II metal salt of an acid having a carbon number of 1 to 6 to evaporate the solvent and recover the solute and the solvent, wherein decomposition of the solvent and halogenation of the solute are minimized.
Claim 3
Dependent Claim
25 words
The method of claim 1 wherein the amount of salt is within about 0.5 to about 50 weight percent based on the amount of solute.
Claim 4
Dependent Claim
28 words
The method of claim 1 wherein the salt is selected from the group consisting of ammonium carbonate, ammonium bicarbonate, ammonium formate, ammonium oxalate, sodium formate, and calcium formate.
Claim 5
Dependent Claim
28 words
The method of claim 1 wherein the halogenated organic solvent is a hydrocarbon of carbon number 1 through 6 and is substituted by at least one halogen atom.
Claim 6
Dependent Claim
21 words
The method of claim 4 wherein the solvent is selected from the group consisting of methylene chloride, chloroform, and perhalo compounds.
Claim 7
Dependent Claim
18 words
The method of claim 1 wherein the halogenated solvent has a boiling point less than about 50° C.
Claim 8
Dependent Claim
22 words
The method of claim 6 wherein the stripping is performed at a temperature of within about 100° C. to about 200° C.
Claim 9
Dependent Claim
21 words
The method of claim 1 wherein the stripping is performed at a temperature within about 100° C. to about 200° C.
Claim 10
Independent Claim
61 words
A method for recovery of halogenated organic solvent from a solute comprising: stripping a halogenated organic solvent from an extracted solute in the presence of an ammonium salt of an acid having a carbon number of 1 or 2 to evaporate the solvent and recover the solute and solvent, wherein decomposition of the solvent and halogenation of the solute are minimized.
Claim 11
Independent Claim
61 words
A method for recovery of halogenated organic solvent from a solute comprising: stripping a halogenated organic solvent from an extracted solute in the presence of an ammonium salt of an acid having a carbon number of 1 or 2 to evaporate the solvent and recover the solute and solvent, wherein decomposition of the solvent and halogenation of the solute are minimized.
Claim 12
Dependent Claim
25 words
The method of claim 9 wherein the amount of salt is within about 0.5 to about 50 weight percent based on the amount of solute.
Claim 13
Dependent Claim
25 words
The method of claim 9 wherein the amount of salt is within about 0.5 to about 5.0 weight percent based on the amount of solute.
Claim 14
Dependent Claim
25 words
The method of claim 9 wherein the halogenated organic solvent is a hydrocarbon of carbon number 1 to 6 substituted by at least one halogen.
Claim 15
Dependent Claim
25 words
The method of claim 12 wherein the amount of salt is within about 0.5 to about 5.0 weight percent based on the amount of solute.
Claim 16
Dependent Claim
22 words
The method of claim 9 wherein the stripping is performed at a temperature of within about 100° C. to about 200° C.
Claim 17
Independent Claim
77 words
A method for recovery of bitumen from a bitumen containing material comprising: contacting a bitumen containing carbonaceous material with a halogenated organic solvent; separating spent material from the resulting solvent bitumen solution in the presence of an ammonium, Group metal, or Group II metal salt of an acid of carbon number 1 or 2 to evaporate the solvent and recover the bitumen and the solvent, wherein decomposition of the solvent and halogenation of the bitumen are minimized.
Claim 18
Independent Claim
77 words
A method for recovery of bitumen from a bitumen containing material comprising: contacting a bitumen containing carbonaceous material with a halogenated organic solvent; separating spent material from the resulting solvent bitumen solution in the presence of an ammonium, Group metal, or Group II metal salt of an acid of carbon number 1 or 2 to evaporate the solvent and recover the bitumen and the solvent, wherein decomposition of the solvent and halogenation of the bitumen are minimized.
Claim 19
Dependent Claim
39 words
The method of claim 15 wherein the bitumen containing carbonaceous material is selected from the group consisting of oil shale, tar sands, heavy oils, petroleum resids, and coal, oil shale or biomass which has been treated to produce bitumen.
Claim 20
Dependent Claim
22 words
The method of claim 15 wherein the salt is selected from the group consisting of ammonium bicarbonate, ammonium carbonate, and ammonium formate.
Claim 21
Dependent Claim
24 words
The method of claim 15 wherein the amount of salt is about 0.5 to about 5.0 weight percent based on the amount of bitumen.
Claim 22
Dependent Claim
26 words
The method of claim 15 wherein the halogenated organic solvent has a carbon number of 1 to 6 and is substituted by at least one halogen.
Claim 23
Dependent Claim
18 words
The method of claim 19 wherein the halogenated solvent has a boiling point less than about 50° C.
Claim 24
Dependent Claim
23 words
The method of claim 20 wherein the bitumen solvent solution is heated to a temperature within about 100° C. to about 200° C.
Claim 25
Dependent Claim
23 words
The method of claim 15 wherein the bitumen solvent solution is heated to a temperature within about 100° C. to about 200° C.
Claim 26
Dependent Claim
10 words
The method of claim 1 wherein the solute is bitumen.
Claim 27
Dependent Claim
10 words
The method of claim 9 wherein the solute is bitumen.
Claim 28
Independent Claim
78 words
A method for the recovery of bitumen from a bitumen containing material comprising: contacting a bitumen containing carbonaceous material with a halogenated organic solvent; separating spent material from the resulting solvent bitumen solution; and stripping the solvent bitumen solution in the presence of an ammonium salt of an acid of carbon number 1 or 2 to evaporate the solvent and recover the bitumen and the solvent, wherein decomposition of the solvent and halogenation of the bitumen are minimized.
Claim 29
Independent Claim
78 words
A method for the recovery of bitumen from a bitumen containing material comprising: contacting a bitumen containing carbonaceous material with a halogenated organic solvent; separating spent material from the resulting solvent bitumen solution; and stripping the solvent bitumen solution in the presence of an ammonium salt of an acid of carbon number 1 or 2 to evaporate the solvent and recover the bitumen and the solvent, wherein decomposition of the solvent and halogenation of the bitumen are minimized.
Claim 30
Dependent Claim
39 words
The method of claim 25 wherein the bitumen containing carbonaceous material is selected from the group consisting of oil shale, tar sands, heavy oils, petroleum resids, and coal, oil shale or biomass which has been treated to produce bitumen.
Claim 31
Dependent Claim
22 words
The method of claim 25 wherein the salt is selected from the group consisting of ammonium bicarbonate, ammonium carbonate, and ammonium formate.
Claim 32
Dependent Claim
23 words
The method of claim 25 wherein the amount of salt is about 0.5 to about 5.0 wt.% based on the amount of bitumen.
Claim 33
Dependent Claim
26 words
The method of claim 25 wherein the halogenated organic solvent has a carbon number of 1 to 6 and is substituted by at least one halogen.
Claim 34
Dependent Claim
18 words
The method of claim 29 wherein the halogenated solvent has a boiling point less than about 50° C.
Claim 35
Dependent Claim
23 words
The method of claim 30 wherein the bitumen solvent solution is heated to a temperature within about 100° C. to about 200° C.
Claim 36
Dependent Claim
23 words
The method of claim 25 wherein the bitumen solvent solution is heated to a temperature within about 100° C. to about 200° C.
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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) | 1988-10-21 | 1989-04-22 | 1989-10-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1992-10-21 | 1993-04-22 | 1993-10-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1996-10-21 | 1997-04-22 | 1997-10-22 | $7700.00 | Window Closed / Lapsed |