US3983048A
Expired / Lapsed
US
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Composition for accelerating oxygen removal comprised of a mixture of aqueous hydrazine and an aryl amine compound
Assignee: Olin Corp
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Filing: 1973-12-10
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Granted: 1976-09-28
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Expires: 1993-12-10
Abstract
Abstract The rapid removal of dissolved oxygen from aqueous solutions is accomplished by the use of a composition comprised of a mixture of an aqueous solution of hydrazine and a catalytic proportion of an aryl amine compound. The compositions of this invention are particularly useful in the removal of dissolved oxygen from aqueous solutions such as boiler water, thereby inhibiting corrosion of the metal surfaces of the boiler.
Inventors
- 👤 Henry W. Schiessl
- 👤 John D. Kaufman
- 👤 David A. Csejka
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 10:28
CPC Classifications
C; C23; C23F; C23F11/00; C23F11/08; B; B01; B01J; B01J19/00; B01J19/0006; B01J19/002; C02; C02F; C02F1/00; C02F1/20; C23F11/10; C23F11/14; C23F11/141
Claims Analysis
Total Claims: 14
Claim 1
Independent Claim
66 words
A composition for the removal of dissolved oxygen from liquids or gases comprised of a mixture of an aqueous solution of hydrazine and a catalytic proportion of an aryl amine compound having the formula ##EQU1##a. wherein R is an aryl group containing from about 6 to about 14 carbon atoms; b. wherein A, D, E, G, and L are individually selected from the group consisting of
Claim 2
Dependent Claim
66 words
A composition for the removal of dissolved oxygen from liquids or gases comprised of a mixture of an aqueous solution of hydrazine and a catalytic proportion of an aryl amine compound having the formula ##EQU1##a. wherein R is an aryl group containing from about 6 to about 14 carbon atoms; b. wherein A, D, E, G, and L are individually selected from the group consisting of
Claim 3
Dependent Claim
92 words
amine 2. hydrogen 3. sulfonic acid 4. alkali metal salts of sulfonic acid 5. carboxylic acid 6. alkali metal salts of carboxylic acid 7. sulfuric acid 8. alkali metal salts of sulfuric acid 9. alkyl having from 1 to 4 carbon atoms, and 10. haloalkyl having from 1 to 4 carbon atoms wherein at least one of said substituents is other than hydrogen; c. wherein X and Z are individually selected from the group consisting of hydrogen and alkyl having from 1 to 4 carbon atoms, and d. wherein N is nitrogen.
Claim 4
Dependent Claim
92 words
amine 2. hydrogen 3. sulfonic acid 4. alkali metal salts of sulfonic acid 5. carboxylic acid 6. alkali metal salts of carboxylic acid 7. sulfuric acid 8. alkali metal salts of sulfuric acid 9. alkyl having from 1 to 4 carbon atoms, and 10. haloalkyl having from 1 to 4 carbon atoms wherein at least one of said substituents is other than hydrogen; c. wherein X and Z are individually selected from the group consisting of hydrogen and alkyl having from 1 to 4 carbon atoms, and d. wherein N is nitrogen.
Claim 5
Dependent Claim
31 words
The composition of claim 1 wherein said catalytic proportion is equivalent to a weight ratio of said aryl amine compound to said hydrazine compound of from about 1:1500 to about 1:15.
Claim 6
Dependent Claim
31 words
The composition of claim 2 wherein said catalytic proportion is equivalent to a weight ratio of said aryl amine compound to said hydrazine compound of from about 1:150 to about 1:50.
Claim 7
Dependent Claim
13 words
The composition of claim 3 wherein said aryl amine compound is toluene diamine.
Claim 8
Dependent Claim
13 words
The composition of claim 3 wherein said aryl amine compound is phenylene diamine.
Claim 9
Dependent Claim
12 words
The composition of claim 3 wherein said aryl amine compound is aminobenzotrifluoride.
Claim 10
Dependent Claim
25 words
The composition of claim 2 wherein the concentration of said hydrazine in said aqueous solution is from about 5 to about 65 percent by weight.
Claim 11
Dependent Claim
25 words
The composition of claim 3 wherein the concentration of said hydrazine in said aqueous solution is from about 15 to about 50 percent by weight.
Claim 12
Dependent Claim
29 words
The composition of claim 1 wherein said aryl amine compound has the formula ##STR3##wherein A, D and E are each a substituent individually selected from the group consisting of:
Claim 13
Dependent Claim
34 words
amine 2. hydrogen 3. sulfonic acid 4. alkyl having 1 to 4 carbon atoms 5. haloalkyl having 1 to 4 carbon atoms and wherein at least one of said substituents is other than hydrogen.
Claim 14
Dependent Claim
34 words
amine 2. hydrogen 3. sulfonic acid 4. alkyl having 1 to 4 carbon atoms 5. haloalkyl having 1 to 4 carbon atoms and wherein at least one of said substituents is other than hydrogen.
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) | 1979-09-28 | 1980-03-29 | 1980-09-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-09-28 | 1984-03-29 | 1984-09-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-09-28 | 1988-03-29 | 1988-09-28 | $7700.00 | Window Closed / Lapsed |