US4008315A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for reducing nitrogen oxide losses from certain slurries and solutions by the addition of phosphate salts
Assignee: Veba Oel AG
•
Filing: 1973-01-02
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Granted: 1977-02-15
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Expires: 1993-01-02
Abstract
Abstract Nitrous oxide losses are reduced by bringing acid to weakly alkaline salt solutions or suspensions into media containing nitrous oxide or media which develop nitrous oxide.
Inventors
- 👤 Ernst-Helmut Philippi
- 👤 Helmut Pokorny
- 👤 Wolfgang Mumme
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 14:54
CPC Classifications
C; C05; C05B; C05B11/00; C05B11/04; C05B11/06
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
66 words
A process for preventing nitrogen oxide loss from a liquid or slurry containing an oxide of nitrogen which comprises applying thereto salt solutions or suspensions of the phosphate of ammonium, the alkali metals and magnesium, individually or in mixtures, said salt solutions or suspensions being used in a concentration of at least 3% by weight and adjusted to a pH value of from 0.5 to 8.
Claim 2
Dependent Claim
66 words
A process for preventing nitrogen oxide loss from a liquid or slurry containing an oxide of nitrogen which comprises applying thereto salt solutions or suspensions of the phosphate of ammonium, the alkali metals and magnesium, individually or in mixtures, said salt solutions or suspensions being used in a concentration of at least 3% by weight and adjusted to a pH value of from 0.5 to 8.
Claim 3
Dependent Claim
20 words
Process of claim 1 wherein said salt solutions or suspension is a 5-20 weight percent ammonium phosphate solution or slurry.
Claim 4
Dependent Claim
91 words
A process for preventing nitrogen oxide loss from a liquid or slurry containing an oxide of nitrogen which comprises applying thereto salt solutions or suspensions of the phosphate of ammonium, the alkali metals and magnesium individually or in mixtures to reaction mixtures capable of forming nitrogen oxides by adding said solutions or suspensions to the reaction mixtures thereby preventing the formation of nitrogen oxides, said salt solutions or suspensions being used in a concentration of at least 3% by weight and adjusted to a pH value of from 0.5 to 8.
Claim 5
Dependent Claim
91 words
A process for preventing nitrogen oxide loss from a liquid or slurry containing an oxide of nitrogen which comprises applying thereto salt solutions or suspensions of the phosphate of ammonium, the alkali metals and magnesium individually or in mixtures to reaction mixtures capable of forming nitrogen oxides by adding said solutions or suspensions to the reaction mixtures thereby preventing the formation of nitrogen oxides, said salt solutions or suspensions being used in a concentration of at least 3% by weight and adjusted to a pH value of from 0.5 to 8.
Claim 6
Dependent Claim
20 words
Process of claim 3 wherein said salt solutions or suspensions is a 5-20 weight percent ammonium phosphate solution or slurry.
Claim 7
Dependent Claim
42 words
Process of claim 3 wherein said reaction mixture is a phosphate rock decomposition with nitric acid and said solutions or suspensions are applied to the surface of the phosphate rock mass in quantities of from 5-20% by weight of the rock mass.
References Cited (Backward Citations)
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Cited
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Cited
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Cited
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Cited
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Cited
US3594150A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1980-02-15 | 1980-08-16 | 1981-02-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-02-15 | 1984-08-16 | 1985-02-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-02-15 | 1988-08-16 | 1989-02-15 | $7700.00 | Window Closed / Lapsed |