US4361487A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Control of hydrogen sulfide emission from geothermal steam plants with hydrogen peroxide and sodium vanadate
Assignee: FMC Corp
•
Filing: 1981-02-09
•
Granted: 1982-11-30
•
Expires: 2001-02-09
Abstract
Abstract Removing hydrogen sulfide from geothermal steam condensate is described whereby the hydrogen sulfide that is present in the condensate from a geothermal steam plant is oxidized with a peroxygen compound such as hydrogen peroxide in the presence of catalytic quantities of sodium vanadate under neutral to alkaline conditions.
Inventors
- 👤 William A. Hills
- 👤 Richard A. Brown
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 23:22
CPC Classifications
C; C02; C02F; C02F1/00; C02F1/72; C02F1/722; C02F1/725
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
39 words
A process for removing hydrogen sulfide from the condensate of spent steam in a geothermal power plant which comprises oxidizing said hydrogen sulfide with a peroxygen compound in the presence of a vanadate catalyst under neutral to alkaline conditions.
Claim 2
Dependent Claim
39 words
A process for removing hydrogen sulfide from the condensate of spent steam in a geothermal power plant which comprises oxidizing said hydrogen sulfide with a peroxygen compound in the presence of a vanadate catalyst under neutral to alkaline conditions.
Claim 3
Dependent Claim
24 words
The process of claim 1 wherein the oxidation reaction is conducted with the pH of the steam condensate between about 7.0 and about 9.0.
Claim 4
Dependent Claim
17 words
The process of claim 2 wherein the oxidation reaction is conducted at a pH of about 9.0.
Claim 5
Dependent Claim
22 words
The process of claim 1 wherein said catalyst is present in the amount of about 0.5 to about 2.0 parts per million.
Claim 6
Dependent Claim
18 words
The process of claim 4 wherein said catalyst is present in amounts of about 1 part per million.
Claim 7
Dependent Claim
16 words
The process of claim 1 wherein the temperature of the steam condensate is about 50° C.
Claim 8
Dependent Claim
12 words
The process of claim 1 wherein the peroxygen compound is hydrogen peroxide.
Claim 9
Dependent Claim
14 words
The process of claim 7 wherein the hydrogen peroxide is aqueous 30% hydrogen peroxide.
Claim 10
Dependent Claim
29 words
The process of claim 2 wherein the pH of the steam condensate is adjusted to a pH between about 7.0 and about 9.0 through the addition of sodium hydroxide.
Claim 11
Dependent Claim
29 words
The process of claim 2 wherein the pH of the steam condensate is adjusted to a pH between about 7.0 and about 9.0 through the addition of potassium hydroxide.
References Cited (Backward Citations)
GB280165A
Cited
GB421970A
Cited
US3097926A
Cited
US3471254A
Cited
US3716620A
Cited
US3969479A
Cited
US3941875A
Cited
US3972989A
Cited
US4192854A
Cited
US4151260A
Cited
US4163044A
Cited
US4259300A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1985-11-29 | 1986-05-31 | 1986-11-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1989-11-29 | 1990-05-31 | 1990-11-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1993-11-29 | 1994-05-31 | 1994-11-30 | $7700.00 | Window Closed / Lapsed |