US3965249A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Anti-pollution method
Assignee: Alcoa Corp
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Filing: 1975-01-20
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Granted: 1976-06-22
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Expires: 1995-01-20
Abstract
Abstract Use of Co, Ni, Cu or Ca catalyst to decompose hypochlorite contained in the product resulting from scrubbing of chlorine-containing gas.
Inventors
- 👤 Donald L. Kinosz
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 01:19
CPC Classifications
C; C02; C02F; C02F1/00; C02F1/70; B; B01; B01D; B01D53/00; B01D53/34; B01D53/46; B01D53/68; B01D53/74; B01D53/86; B01D53/8659; B01J; B01J23/00; B01J23/02; B01J23/70; C01; C01B; C01B7/00; C01B7/01; C02F2303/00; C02F2303/18; C02F2303/185
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
145 words
A process for treating chlorine-containing gas to convert the chlorine therein to a chloride which comprises: a. scrubbing chlorine-containing gas with an aqueous base selected from the class consisting of an alkali metal compound or an alkaline earth metal compound to convert the chlorine therein to a hypochlorite; solution and b. decomposing said hypochlorite substantially continuously in the resulting solution 1. at a pH maintained between 7-13 2. at a temperature maintained between 20°C and the boiling point of the solution and 3. in the presence of from about 9-1000 ppm based on weight of the hypochlorite solution of an unsupported catalyst selected from the class consisting of cobalt, nickel, copper or calcium, in the form of a salt, fused metal, or metal powder which is converted into a finely divided oxide while converting said hypochlorite into chloride while inhibiting release of free chlorine gas.
Claim 2
Dependent Claim
145 words
A process for treating chlorine-containing gas to convert the chlorine therein to a chloride which comprises: a. scrubbing chlorine-containing gas with an aqueous base selected from the class consisting of an alkali metal compound or an alkaline earth metal compound to convert the chlorine therein to a hypochlorite; solution and b. decomposing said hypochlorite substantially continuously in the resulting solution 1. at a pH maintained between 7-13 2. at a temperature maintained between 20°C and the boiling point of the solution and 3. in the presence of from about 9-1000 ppm based on weight of the hypochlorite solution of an unsupported catalyst selected from the class consisting of cobalt, nickel, copper or calcium, in the form of a salt, fused metal, or metal powder which is converted into a finely divided oxide while converting said hypochlorite into chloride while inhibiting release of free chlorine gas.
Claim 3
Dependent Claim
21 words
The improvement of claim 1 wherein the catalyst is cobalt in the form of a salt, fused metal or metal powder.
Claim 4
Dependent Claim
20 words
The improvement of claim 1 wherein the temperature during the converting of the hypochlorite is maintained at 20°C to 80°C.
Claim 5
Dependent Claim
15 words
The improvement of claim 1 wherein the converting of the hypochlorite is accomplished substantially continuously.
Claim 6
Dependent Claim
17 words
The improvement of claim 1 wherein the converting of the hypochlorite is accomplished in a baffled tank.
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) | 1979-06-22 | 1979-12-22 | 1980-06-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-06-22 | 1983-12-22 | 1984-06-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-06-22 | 1987-12-22 | 1988-06-22 | $7700.00 | Window Closed / Lapsed |