US4552668A
Expired / Lapsed
US
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Oxidation of sulfides in polymer-thickened aqueous solution
Assignee: FMC Corp
•
Filing: 1984-07-30
•
Granted: 1985-11-12
•
Expires: 2004-07-30
Abstract
Abstract A method for preferentially oxidizing sulfide in a viscous, aqueous solution of a hydratable polymeric material suitable for use in hydraulically treating subterranean formations.
Inventors
- 👤 Richard A. Brown
- 👤 Robert D. Norris
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 16:21
CPC Classifications
C; C02; C02F; C02F1/00; C02F1/72; C02F1/722; C09; C09K; C09K8/00; C09K8/02; C09K8/04; C09K8/06; C09K8/12; C09K8/58; C09K8/588; C09K8/60; C09K8/62; C09K8/66; C09K8/68; C09K8/685; E; E21; E21B; E21B43/00; E21B43/02; E21B43/04; Y; Y10; Y10S; Y10S423/00; Y10S423/19; Y10S507/00; Y10S507/922
Claims Analysis
Total Claims: 48
Claim 1
Independent Claim
104 words
A method for oxidizing a sulfide in a viscous, aqueous solution containing from 1 to 100 kg/m 3 of a hydratable polymeric material selected from the group consisting of polysaccharides, polysaccharide derivatives, polyacrylamides, polyacrylamide copolymers, and mixtures thereof comprising the steps of a. adjusting the pH of the aqueous solution between pH 3 and pH 10, and b. incorporating into the aqueous solution i. from 0.01 to 5 parts by weight of a free radical scavenger per hundred parts by weight of the aqueous solution, and ii. sufficient hydrogen peroxide to react with at least part of the sulfide present in the aqueous solution.
Claim 2
Independent Claim
104 words
A method for oxidizing a sulfide in a viscous, aqueous solution containing from 1 to 100 kg/m 3 of a hydratable polymeric material selected from the group consisting of polysaccharides, polysaccharide derivatives, polyacrylamides, polyacrylamide copolymers, and mixtures thereof comprising the steps of a. adjusting the pH of the aqueous solution between pH 3 and pH 10, and b. incorporating into the aqueous solution i. from 0.01 to 5 parts by weight of a free radical scavenger per hundred parts by weight of the aqueous solution, and ii. sufficient hydrogen peroxide to react with at least part of the sulfide present in the aqueous solution.
Claim 3
Dependent Claim
37 words
The method of claim 1 wherein the pH of the aqueous solution is adjusted between pH 3 and pH 7 and approximately one mol of hydrogen peroxide is added per mol of hydrogen sulfide to be oxidized.
Claim 4
Dependent Claim
20 words
The method of claim 2 wherein an effective amount of a transition metal activator is incorporated into the aqueous solution.
Claim 5
Dependent Claim
25 words
The method of claim 3 wherein the free radical scavenger is selected from the group consisting of aromatic hydroxy compounds, unsaturated alcohols, and allylic compounds.
Claim 6
Dependent Claim
46 words
The method of claim 4 wherein the transition metal activator is selected from the group consisting of copper, iron, a coordination compound of copper or iron containing at least one single dentate ligand and a chelate of copper or iron containing at least one multidentate ligand.
Claim 7
Dependent Claim
46 words
The method of claim 3 wherein the transition metal activator is selected from the group consisting of copper, iron, a coordination compound of copper or iron containing at least one single dentate ligand and a chelate of copper or iron containing at least one multidentate ligand.
Claim 8
Dependent Claim
25 words
The method of claim 2 wherein the free radical scavenger is selected from the group consisting of aromatic hydroxy compounds, unsaturated alcohols, and allylic compounds.
Claim 9
Dependent Claim
46 words
The method of claim 7 wherein the transition metal activator is selected from the group consisting of copper, iron, a coordination compound of copper or iron containing at least one single dentate ligand and a chelate of copper or iron containing at least one multidentate ligand.
Claim 10
Dependent Claim
58 words
The method of claim 1 wherein the aqueous solution is absent a catalytic quantity of vanadate ion, the pH of the aqueous solution is adjusted between pH 7 and pH 8.2 and more than one mol and less than four mols of hydrogen peroxide is incorporated into the aqueous solution per mol of hydrogen sulfide to be oxidized.
Claim 11
Dependent Claim
20 words
The method of claim 9 wherein an effective amount of a transition metal activator is incorporated into the aqueous solution.
Claim 12
Dependent Claim
25 words
The method of claim 10 wherein the free radical scavenger is selected from the group consisting of aromatic hydroxy compounds, unsaturated alcohols, and allylic compounds.
Claim 13
Dependent Claim
46 words
The method of claim 11 wherein the transition metal activator is selected from the group consisting of copper, iron, a coordination compound of copper or iron containing at least one single dentate ligand and a chelate of copper or iron containing at least one multidentate ligand.
Claim 14
Dependent Claim
46 words
The method of claim 10 wherein the transition metal activator is selected from the group consisting of copper, iron, a coordination compound of copper or iron containing at least one single dentate ligand and a chelate of copper or iron containing at least one multidentate ligand.
Claim 15
Dependent Claim
25 words
The method of claim 9 wherein the free radical scavenger is selected from the group consisting of aromatic hydroxy compounds, unsaturated alcohols, and allylic compounds.
Claim 16
Dependent Claim
46 words
The method of claim 14 wherein the transition metal activator is selected from the group consisting of copper, iron, a coordination compound of copper or iron containing at least one single dentate ligand and a chelate of copper or iron containing at least one multidentate ligand.
Claim 17
Dependent Claim
52 words
The method of claim 1 wherein the aqueous solution is absent a catalytic quantity of vanadate ion, the pH of the aqueous solution is adjusted to be pH 8.2 or greater, and approximately four mols of hydrogen peroxide are incorporated into the aqueous solution per mol of hydrogen sulfide to be oxidized.
Claim 18
Dependent Claim
20 words
The method of claim 16 wherein an effective amount of a transition metal activator is incorporated into the aqueous solution.
Claim 19
Dependent Claim
25 words
The method of claim 17 wherein the free radical scavenger is selected from the group consisting of aromatic hydroxy compounds, unsaturated alcohols, and allylic compounds.
Claim 20
Dependent Claim
25 words
The method of claim 18 wherein the free radical scavenger is selected from the group consisting of aromatic hydroxy compounds, unsaturated alcohol, and allylic compounds.
Claim 21
Dependent Claim
46 words
The method of claim 17 wherein the transition metal activator is selected from the group consisting of copper, iron, a coordination compound of copper or iron containing at least one single dentate ligand and a chelate of copper or iron containing at least one multidentate ligand.
Claim 22
Dependent Claim
25 words
The method of claim 16 wherein the free radical scavenger is selected from the group consisting of aromatic hydroxy compounds,, unsaturated alcohols, and allylic compounds.
Claim 23
Dependent Claim
46 words
The method of claim 21 wherein the transition metal activator is selected from the group consisting of copper, iron, a coordination compound of copper or iron containing at least one single dentate ligand and a chelate of copper or iron containing at least one multidentate ligand.
Claim 24
Dependent Claim
48 words
The method of claim 1 wherein a catalytic quantity of vanadate ion is incorporated into the aqueous solution, the pH is adjusted between pH 7 and pH 9 and approximately one mol of hydrogen peroxide is incorporated into the aqueous solution per mol of sulfide to be oxidized.
Claim 25
Dependent Claim
20 words
The method of claim 23 wherein an effective amount of a transition metal activator is incorporated into the aqueous solution.
Claim 26
Dependent Claim
25 words
The method of claim 24 wherein the free radical scavenger is selected from the group consisting of aromatic hydroxy compounds, unsaturated alcohols, and allylic compounds.
Claim 27
Dependent Claim
25 words
The method of claim 25 wherein the free radical scavenger is selected from the group consisting of aromatic hydroxy compounds, unsaturated alcohols, and allylic compounds.
Claim 28
Dependent Claim
46 words
The method of claim 24 wherein the transition metal activator is selected from the group consisting of copper, iron, a coordination compound of copper or iron containing at least one single dentate ligand and a chelate of copper or iron containing at least one multidentate ligand.
Claim 29
Dependent Claim
25 words
The method of claim 23 wherein the free radical scavenger is selected from the group consisting of aromatic hydroxy compounds, unsaturated alcohols, and allylic compounds.
Claim 30
Dependent Claim
46 words
The method of claim 28 wherein the transition metal activator is selected from the group consisting of copper, iron, a coordination compound of copper or iron containing at least one single dentate ligand and a chelate of copper or iron containing at least one multidentate ligand.
Claim 31
Dependent Claim
20 words
The method of claim 1 wherein an effective amount of a transition metal activator is incorporated into the aqueous solution.
Claim 32
Dependent Claim
25 words
The method of claim 30 wherein the free radical scavenger is selected from the group consisting of aromatic hydroxy compounds, unsaturated alcohols, and allylic compounds.
Claim 33
Dependent Claim
46 words
The method of claim 31 wherein the transition metal activator is selected from the group consisting of copper, iron, a coordination compound of copper or iron containing at least one single dentate ligand and a chelate of copper or iron containing at least one multidentate ligand.
Claim 34
Dependent Claim
46 words
The method of claim 30 wherein the transition metal activator is selected from the group consisting of copper, iron, a coordination compound of copper or iron containing at least one single dentate ligand and a chelate of copper or iron containing at least one multidentate ligand.
Claim 35
Dependent Claim
25 words
The method of claim 1 wherein the free radical scavenger is selected from the group consisting of aromatic hydroxy compounds, unsaturated alcohols, and allylic compounds.
Claim 36
Dependent Claim
46 words
The method of claim 34 wherein the transition metal activator is selected from the group consisting of copper, iron, a coordination compound of copper or iron containing at least one single dentate ligand and a chelate of copper or iron containing at least one multidentate ligand.
Claim 37
Independent Claim
107 words
A method for oxidizing a sulfide in a viscous, aqueous solution containing from 1 to 100 kg/m 3 of a hydratable polymeric material selected from the group consisting of polysaccharides, polysaccharide derivatives, polyacrylamides, polyacrylamide copolymers, and mixtures thereof comprising the steps of a. adjusting the pH of the aqueous solution between pH 3 and pH 10, and b. incorporating into the aqueous solution i. from 0.05 to 0.5 parts by weight of a compound selected from the group consisting of aromatic hydroxy compounds, unsaturated compounds and allylic compounds, and ii. sufficient hydrogen peroxide to react with at least part of the sulfide present in the aqueous solution.
Claim 38
Independent Claim
107 words
A method for oxidizing a sulfide in a viscous, aqueous solution containing from 1 to 100 kg/m 3 of a hydratable polymeric material selected from the group consisting of polysaccharides, polysaccharide derivatives, polyacrylamides, polyacrylamide copolymers, and mixtures thereof comprising the steps of a. adjusting the pH of the aqueous solution between pH 3 and pH 10, and b. incorporating into the aqueous solution i. from 0.05 to 0.5 parts by weight of a compound selected from the group consisting of aromatic hydroxy compounds, unsaturated compounds and allylic compounds, and ii. sufficient hydrogen peroxide to react with at least part of the sulfide present in the aqueous solution.
Claim 39
Dependent Claim
33 words
The method of claim 36 wherein the pH is adjusted between pH 3 and pH 7 and approximately one mol of hydrogen peroxide is added per mol of hydrogen sulfide to be oxidized.
Claim 40
Dependent Claim
57 words
The method of claim 36 wherein the aqueous solution is absent a catalytic quantity of vanadate ion, the pH of the solution is adjusted between pH 7 and pH 8.2 and more than one mol and less than four mols of hydrogen peroxide is incorporated into the aqueous solution per mol of hydrogen sulfide to be oxidized.
Claim 41
Dependent Claim
52 words
The method of claim 36 wherein the aqueous solution is absent a catalytic quantity of vanadate ion, the pH of the aqueous solution is adjusted to be pH 8.2 or greater, and approximately four mols of hydrogen peroxide are incorporated into the aqueous solution per mol of hydrogen sulfide to be oxidized.
Claim 42
Dependent Claim
63 words
The method of claim 36 wherein a catalytic amount of vanadate ion is incorporated into the aqueous solution equivalent to 0.5 to 2 mg of sodium vanadate per kilogram of the aqueous solution, the pH is adjusted between pH 7 and pH 9, and approximately one mol of hydrogen peroxide is incorporated into the aqueous solution per mol of sulfide to be oxidized.
Claim 43
Independent Claim
151 words
A method for oxidizing a sulfide in a viscous, aqueous solution containing from 1 to 100 kg/m 3 of a hydratable polymeric material selected from the group consisting of polysaccharides, polysaccharide derivatives, polyacrylamides, polyacrylamide copolymers, and mixtures thereof comprising the steps of a. adjusting the pH of the aqueous solution between pH 3 and pH 10, and b. incorporating into the aqueous solution i. from 0.05 to 0.5 parts by weight of a compound selected from the group consisting of aromatic hydroxy compounds, unsaturated compounds and allylic compounds, ii. sufficient hydrogen peroxide to react with at least part of the sulfide present in the aqueous solution, and iii. an effective amount of a transition metal activator selected from the group consisting of copper, iron, a coordination compound of copper or iron containing at least one single dentate ligand or a chelate of copper or iron containing at least one multidentate ligand.
Claim 44
Independent Claim
151 words
A method for oxidizing a sulfide in a viscous, aqueous solution containing from 1 to 100 kg/m 3 of a hydratable polymeric material selected from the group consisting of polysaccharides, polysaccharide derivatives, polyacrylamides, polyacrylamide copolymers, and mixtures thereof comprising the steps of a. adjusting the pH of the aqueous solution between pH 3 and pH 10, and b. incorporating into the aqueous solution i. from 0.05 to 0.5 parts by weight of a compound selected from the group consisting of aromatic hydroxy compounds, unsaturated compounds and allylic compounds, ii. sufficient hydrogen peroxide to react with at least part of the sulfide present in the aqueous solution, and iii. an effective amount of a transition metal activator selected from the group consisting of copper, iron, a coordination compound of copper or iron containing at least one single dentate ligand or a chelate of copper or iron containing at least one multidentate ligand.
Claim 45
Dependent Claim
33 words
The method of claim 41 wherein the pH is adjusted between pH 3 and pH 7 and approximately one mol of hydrogen peroxide is added per mol of hydrogen sulfide to be oxidized.
Claim 46
Dependent Claim
49 words
The method of claim 41 wherein the aqueous solution is absent a catalytic quantity of sodium vanadate, pH is adjusted between pH 7 and pH 8.2 and more than one mol and less than four mols of hydrogen peroxide is added per mol of hydrogen sulfide to be oxidized.
Claim 47
Dependent Claim
42 words
The method of claim 41 wherein the aqueous solution is absent a catalytic quantity of sodium vanadate, pH is adjusted between pH 3 and pH 7 and one mol of hydrogen peroxide is added per mol of hydrogen sulfide to be oxidized.
Claim 48
Dependent Claim
47 words
The method of claim 41 wherein a catalytic quantity of vanadate ion is incorporated into the aqueous solution, the pH is adjusted between pH 7 and pH 9 and one mol of hydrogen peroxide is incorporated into the aqueous solution per mol of sulfide to be oxidized.
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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) | 1988-11-11 | 1989-05-13 | 1989-11-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1992-11-11 | 1993-05-13 | 1993-11-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1996-11-11 | 1997-05-13 | 1997-11-12 | $7700.00 | Window Closed / Lapsed |