Patent US4185071A successfully refreshed from Google Patents.
US4185071A
Expired / Lapsed
US
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Ethylene polyamines as cold-end additives
Assignee: Veolia WTS USA Inc
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Filing: 1978-10-13
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Granted: 1980-01-22
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Expires: 1998-10-13
Abstract
Abstract A method of reducing the amount of corrosion due to sulfuric acid on metal parts at the cold-end of a combustion system and in contact with combustion gases derived from the combustion of sulfur-containing fuel, said method comprising adding to the combustion gases an effective amount for the purpose of an ethylene polyamine additive.
Inventors
- 👤 Richard J. Sujdak
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 02:18
CPC Classifications
C; C23; C23F; C23F11/00; C23F11/02
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
148 words
A method of reducing the amount of sulfuric acid corrosion of metal parts at the cold-end of a combustion system and in contact with combustion gases derived from the combustion of sulfur-containing fuel, which combustion gases flow along a path at the cold end of the combustion system from a first zone of relative turbulence to a second zone at which said metal parts are located, said method comprising: adding to the combustion gases at the cold end of the combustion system and at the zone of turbulence an effective amount for the purpose of an additive comprising at least one member of the group consisting of ethylene polyamines which include a hydrocarbon chain consisting of at least two amino groups which are ethylene-interconnected such that said additive will travel along with said gases as vapor and/or liquid droplets, from said zone of turbulence to said second zone.
Claim 2
Independent Claim
148 words
A method of reducing the amount of sulfuric acid corrosion of metal parts at the cold-end of a combustion system and in contact with combustion gases derived from the combustion of sulfur-containing fuel, which combustion gases flow along a path at the cold end of the combustion system from a first zone of relative turbulence to a second zone at which said metal parts are located, said method comprising: adding to the combustion gases at the cold end of the combustion system and at the zone of turbulence an effective amount for the purpose of an additive comprising at least one member of the group consisting of ethylene polyamines which include a hydrocarbon chain consisting of at least two amino groups which are ethylene-interconnected such that said additive will travel along with said gases as vapor and/or liquid droplets, from said zone of turbulence to said second zone.
Claim 3
Dependent Claim
14 words
The method of claim 1, wherein said ethylene polyamine is added in droplet form.
Claim 4
Dependent Claim
15 words
The method of claim 1, wherein said ethylene polyamine is added as an aqueous solution.
Claim 5
Dependent Claim
15 words
The method of claim 3, wherein said aqueous solution is sprayed into the combustion gases.
Claim 6
Dependent Claim
20 words
The method of claim 1, wherein the combustion system is a steam generating system and the fuel is sulfur-containing oil.
Claim 7
Dependent Claim
14 words
The method of claim 5, wherein said ethylene polyamine is added in droplet form.
Claim 8
Dependent Claim
15 words
The method of claim 5, wherein said ethylene polyamine is added as an aqueous solution.
Claim 9
Dependent Claim
15 words
The method of claim 7, wherein said aqueous solution is sprayed into the combustion gases.
Claim 10
Dependent Claim
35 words
The method of claim 8, wherein said ethylene polyamine is an aqueous solution which is added to said combustion gases at the rate of about from 0.0001 to 1.0 mole per barrel of fuel consumed.
References Cited (Backward Citations)
US2106446A
Cited
US2155853A
Cited
US2972861A
Cited
GB872984A
Cited
US3343908A
Cited
US3547583A
Cited
US3809745A
Cited
US3856921A
Cited
GB1305750A
Cited
US3709977A
Cited
US3720754A
Cited
US3873673A
Cited
US3904735A
Cited
US3962404A
Cited
US3886261A
Cited
US3932588A
Cited
US3961018A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1983-01-21 | 1983-07-23 | 1984-01-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1987-01-21 | 1987-07-23 | 1988-01-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1991-01-21 | 1991-07-23 | 1992-01-22 | $7700.00 | Window Closed / Lapsed |