US3800466A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Composition for treating aqueous alkaline fuel
Assignee: Sybron Transition Corp
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Filing: 1971-12-13
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Granted: 1974-04-02
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Expires: 1991-12-13
Abstract
Abstract Method for improving the burning characteristics of aqueous alkaline fuels by the addition of a sequestered metal ion as catalyst to promote oxidation of water soluble organic matter and carbon. In the Kraft process the method also substantially reduces the proportion of sodium sulfide in the flue gas. An additive consisting of a water soluble salt of manganese, copper, iron, tin, nickel or cobalt or mixtures of these metals is solubilized in an aqueous medium at an alkaline pH with a conventional sequestering agent and added to the aqueous fuel in proportions of about 2 to about 50ppm based on the metal ion. The additive is stable and soluble in the aqueous fuel. Oxygen demand of slag is substantially reduced and slag is softer and more friable.
Inventors
- 👤 A Heit
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 16:01
CPC Classifications
F; F28; F28G; F28G9/00; D; D21; D21C; D21C11/00; D21C11/12
Claims Analysis
Total Claims: 15
Claim 1
Independent Claim
12 words
The fuel additive of claim 1 wherein said catalyst metal is manganese.
Claim 2
Dependent Claim
14 words
The fuel additive of claim 1 wherein said catalyst metal is manganese and iron.
Claim 3
Dependent Claim
14 words
The fuel additive of claim 1 having a pH of at least about 9.
Claim 4
Dependent Claim
19 words
The aqueous fuel additive of claim 1 having a total solids content of between about 25% to about 55%.
Claim 5
Dependent Claim
9 words
The fuel additive of claim 1 consisting essentially of:
Claim 6
Dependent Claim
9 words
The fuel additive of claim 1 consisting essentially of:
Claim 7
Dependent Claim
36 words
The aqueous fuel additive of claim 1 wherein said sequestering agent is present in amounts in excess of the stoichiometric amount required to maintain said catalyst metals in a soluble condition in an alkaline aqueous fuel.
Claim 8
Dependent Claim
100 words
A fuel additive for aqueous alkaline fuels to reduce the determental effects of slagging encountered in the combustion of said aqueous fuel, comprising a water soluble salt of a catalyst metal, a sequestering agent and the hydroxide of sodium or potassium in proportions to provide a pH of at least 9 when said additive is solubilized, the proportion of sequestering agent being at least the stoichiometeric amount required to sequester the catalyst metal ion in an aqueous alkaline solution, said catalyst metal salt being selected from the water soluble salts of manganese, copper, iron, tin, nickel, cobalt and mixtures thereof.
Claim 9
Dependent Claim
17 words
The fuel additive of claim 9 wherein said catalyst metal salt is ferrous sulfate and manganese sulfate.
Claim 10
Dependent Claim
14 words
The fuel additive of claim 9 consisting essentially of on the dry weight basis:
Claim 11
Dependent Claim
13 words
The fuel additive of claim 9 consisting of on the dry weight basis:
Claim 12
Dependent Claim
53 words
An alkaline aqueous fuel composition comprising a substantially uniform blend of a major amount of an alkaline aqueous fuel yielding upon combustion carbon and water soluble organics and a minor but effective amount, of a sequestered catalyst metal selected from the group consisting of manganese, copper, iron, tin, nIckel, cobalt and mixtures thereof.
Claim 13
Dependent Claim
19 words
The fuel composition of claim 13 comprising from about 2 ppm to about 50 ppm of said catalyst metal.
Claim 14
Dependent Claim
30 words
The aqueous fuel composition of claim 13 comprising at least the stoichiometric amount of sequestering agent to sequester said catalyst metal ion for maintaining said catalyst metal ion in solution.
Claim 15
Dependent Claim
30 words
The fuel composition of claim 13 comprising an excess of sequestering agent over the stoichiometric amount to sequester said catalyst metal ion and maintain said catalyst metal ion in solution.
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) | 1977-04-01 | 1977-10-01 | 1978-04-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-04-01 | 1981-10-01 | 1982-04-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-04-01 | 1985-10-01 | 1986-04-02 | $7700.00 | Window Closed / Lapsed |