Patent US3954381A successfully refreshed from Google Patents.
US3954381A
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Method of and apparatus for incinerating an aqueous solution containing nitro compounds
Assignee: Societe pour lEquipement des Industries Chimiques SA
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Filing: 1974-02-25
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Granted: 1976-05-04
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Expires: 1994-02-25
Abstract
Abstract A concentrated aqueous solution containing nitro compound is incinerated in a chamber to produce a hot dry vapor that is fed through a heat-exchange chamber through which the unconcentrated aqueous solution containing the nitro compounds is dripped so as to evaporate the greater portion of the water in this solution and produce the concentrate that is incinerated. The incineration is carried out at a temperature above 1000°C and the hot vapors leave the heat exchange chamber in a dry state. Thereafter these hot vapors are scrubbed in a tower to remove any particulate material therefrom and are allowed to escape into the atmosphere as a nonpolluting gas.
Inventors
- 👤 Paul Marecaux
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 23:08
CPC Classifications
F; F23; F23G; F23G7/00; F23G7/008; C; C02; C02F; C02F1/00; C02F1/02; C02F1/04; C02F1/048; C02F11/00; C02F11/06; Y; Y02; Y02W; Y02W10/00; Y02W10/40; Y10; Y10S; Y10S159/00; Y10S159/19
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
95 words
A method of incinerating an aqueous solution containing a toxic nitro compound solute which comprises the following steps: a. incinerating by combustion with a fuel-air mixture a concentrated liquid containing the toxic solute at a temperature of substantially 1000 to 1200°C to form a hot, dry, detoxified vapor from said liquid; b. passing said hot, dry, detoxified vapor into heat exchange with a trickle of said aqueous solution to concentrate said solution and form more of said liquid while carrying away water by evaporation; and c. feeding said liquid from step (b) to step (a).
Claim 2
Independent Claim
95 words
A method of incinerating an aqueous solution containing a toxic nitro compound solute which comprises the following steps: a. incinerating by combustion with a fuel-air mixture a concentrated liquid containing the toxic solute at a temperature of substantially 1000 to 1200°C to form a hot, dry, detoxified vapor from said liquid; b. passing said hot, dry, detoxified vapor into heat exchange with a trickle of said aqueous solution to concentrate said solution and form more of said liquid while carrying away water by evaporation; and c. feeding said liquid from step (b) to step (a).
Claim 3
Dependent Claim
21 words
The method defined in claim 1 wherein said solution is directly contacted with said vapor by being dripped through said vapor.
Claim 4
Dependent Claim
16 words
The method defined in claim 2, further comprising the step of scrubbing said dry gas mixture.
Claim 5
Dependent Claim
20 words
The method defined in claim 3 wherein said mixture is scrubbed with a spray of finely divided water under pressure.
Claim 6
Independent Claim
122 words
A method of incinerating an aqueous solution containing both a toxic nitro compound solute and acid not destructible by conventional incineration which comprises the following steps: a. incinerating by combustion with a fuel-air mixture a concentrated liquid containing the toxic solute, the acid, and an acid neutralization agent at a temperature of substantially 1000° to 1200°C to form a hot, dry, detoxified vapor from said liquid; b. adding the acid neutralization agent to the aqueous solution containing both a toxic nitro compound and acid; c. passing said hot, dry detoxified vapor into heat exchange with a trickle of aqueous solution containing the toxic solute, the acid and the acid neutralization agent; and d. feeding said liquid from step (c) to step (a).
Claim 7
Independent Claim
122 words
A method of incinerating an aqueous solution containing both a toxic nitro compound solute and acid not destructible by conventional incineration which comprises the following steps: a. incinerating by combustion with a fuel-air mixture a concentrated liquid containing the toxic solute, the acid, and an acid neutralization agent at a temperature of substantially 1000° to 1200°C to form a hot, dry, detoxified vapor from said liquid; b. adding the acid neutralization agent to the aqueous solution containing both a toxic nitro compound and acid; c. passing said hot, dry detoxified vapor into heat exchange with a trickle of aqueous solution containing the toxic solute, the acid and the acid neutralization agent; and d. feeding said liquid from step (c) to step (a).
Claim 8
Dependent Claim
25 words
The method defined in claim 5, step (a) wherein the nondestructible acid is neutralized by addition of caustic soda at a rate of 8.87 kg/hr.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1979-05-04 | 1979-11-03 | 1980-05-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-05-04 | 1983-11-03 | 1984-05-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-05-04 | 1987-11-03 | 1988-05-04 | $7700.00 | Window Closed / Lapsed |