US3929968A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Dry collection of waste materials
Assignee: EIDP Inc
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Filing: 1973-10-10
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Granted: 1975-12-30
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Expires: 1993-10-10
Abstract
Abstract The noxious components of hot, gaseous effluents, e.g., the effluent from an incinerator, can be eliminated by a process which does not require an aqueous discharge. In the process the gaseous effluent is cooled in an evaporative cooler, particulates are then removed in a baghouse or other dry collecting device, the acid or basic gases in the effluent are then absorbed and converted to a salt solution or slurry in a scrubber, and the salt solution or slurry is recycled to the evaporative cooler.
Inventors
- 👤 Steven I Taub
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 16:01
CPC Classifications
B; B01; B01D; B01D53/00; B01D53/34; B01D50/00; B01D51/00; B01D51/10
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
187 words
A PROCESS FOR TREATING HOT GAS STREAMS TO REMOVE ACIDIC OR BASIC GASEOUS COMPONENTS COMPRISING THE STEPS A. PASSING THE HOT GAS THROUGH AN EVAPORATIVE COOLER IN ADMIXTURE WITH A SALT-CONTAINING SCRUBBING SOLUTION AS DEFINED HEREINBELOW, BY WHICH THE HOT GAS IS COOLED ABOVE THE DEW POINT BY EVAPORATION OF LIQUID FROM THE SCRUBBING SOLUTION AND SOLID PARTICLES OF SALT ARE FORMED IN DISPERSION WITH THE GAS; B. FEEDING THE COOLED GAS HAVING SALT PARTICLES DISPERSED THEREIN INTO A DRY COLLECTOR MEANS BY WHICH THE SALT PARTICLES AND ANY OTHER DISPERSED SOLIDS ARE REMOVED FROM THE GAS STREAM; C. FEEDING THE GAS FROM WHICH THE SOLIDS HAVE BEEN REMOVED INTO A SCRUBBER WHEREIN THE ACIDIC OR BASIC COMPONENTS OF THE GAS ARE ABSORBED INTO A SCRUBBING SOLUTION; D. DISCHARGING THE SCRUBBED GAS FROM THE SCRUBBER AND ADJUSTING THE PH OF THE SCRUBBING SOLUTION CONTAINING ABSORBED ACIDIC OR BASIC COMPONENTS BY ADMIXING THEREWITH A SALT-FORMING CHEMICAL BY WHICH A SALT OF THE ACIDIC OR BASIC COMPONENTS IS FORMED IN DISPERSION WITHIN THE SCRUBBING SOLUTION; AND E. FEEDING THE SALT-CONTAINING SCRUBBING SOLUTION TO THE EVAPORATIVE COOLER OF STEP (A).
Claim 2
Dependent Claim
187 words
A PROCESS FOR TREATING HOT GAS STREAMS TO REMOVE ACIDIC OR BASIC GASEOUS COMPONENTS COMPRISING THE STEPS A. PASSING THE HOT GAS THROUGH AN EVAPORATIVE COOLER IN ADMIXTURE WITH A SALT-CONTAINING SCRUBBING SOLUTION AS DEFINED HEREINBELOW, BY WHICH THE HOT GAS IS COOLED ABOVE THE DEW POINT BY EVAPORATION OF LIQUID FROM THE SCRUBBING SOLUTION AND SOLID PARTICLES OF SALT ARE FORMED IN DISPERSION WITH THE GAS; B. FEEDING THE COOLED GAS HAVING SALT PARTICLES DISPERSED THEREIN INTO A DRY COLLECTOR MEANS BY WHICH THE SALT PARTICLES AND ANY OTHER DISPERSED SOLIDS ARE REMOVED FROM THE GAS STREAM; C. FEEDING THE GAS FROM WHICH THE SOLIDS HAVE BEEN REMOVED INTO A SCRUBBER WHEREIN THE ACIDIC OR BASIC COMPONENTS OF THE GAS ARE ABSORBED INTO A SCRUBBING SOLUTION; D. DISCHARGING THE SCRUBBED GAS FROM THE SCRUBBER AND ADJUSTING THE PH OF THE SCRUBBING SOLUTION CONTAINING ABSORBED ACIDIC OR BASIC COMPONENTS BY ADMIXING THEREWITH A SALT-FORMING CHEMICAL BY WHICH A SALT OF THE ACIDIC OR BASIC COMPONENTS IS FORMED IN DISPERSION WITHIN THE SCRUBBING SOLUTION; AND E. FEEDING THE SALT-CONTAINING SCRUBBING SOLUTION TO THE EVAPORATIVE COOLER OF STEP (A).
Claim 3
Dependent Claim
19 words
The process of claim 1 wherein the salt forming chemical is added to the scrubbing solution in the scrubber.
Claim 4
Dependent Claim
25 words
The process of claim 1 wherein the hot gas contains SO2 and the scrubbed gas stream from step (c) is treated to remove the SO2.
Claim 5
Dependent Claim
29 words
The process of claim 1 wherein the hot gas contains essentially water insoluble gaseous components and the scrubbed gas stream from step (c) is treated to remove these components.
Claim 6
Dependent Claim
16 words
The process of claim 4 wherein the essentially water insoluble gaseous components are Cl2 or Br2.
Claim 7
Dependent Claim
12 words
The process of claim 1 wherein an aqueous scrubbing solution is employed.
Claim 8
Dependent Claim
184 words
A process for treating hot gas streams to remove gaseous acidic components comprising the steps a. passing the hot gas through an evaporative cooler in admixture with a salt-containing scrubbing solution as defined hereinbelow, by which the hot gas is cooled above the dew point by evaporation of liquid from the scrubbing solution and solid particles of salt are formed in dispersion with the gas; b. feeding the cooled gas having salt particles dispersed therein into a dry collector meAns by which the salt particles and any other dispersed solids are removed from the gas stream; c. feeding the gas from which the solids have been removed into a scrubber wherein the acidic component of the gas is absorbed into a scrubbing solution; d. discharging the scrubbed gas from the scrubber and raising the pH of the scrubbing solution containing the absorbed acidic component by admixing therewith a salt-forming basic chemical by which a salt of the acid and basic chemical is formed in dispersion within the scrubbing solution; and e. feeding the salt-containing aqueous scrubbing solution to the evaporative cooler of step (a).
Claim 9
Dependent Claim
184 words
A process for treating hot gas streams to remove gaseous acidic components comprising the steps a. passing the hot gas through an evaporative cooler in admixture with a salt-containing scrubbing solution as defined hereinbelow, by which the hot gas is cooled above the dew point by evaporation of liquid from the scrubbing solution and solid particles of salt are formed in dispersion with the gas; b. feeding the cooled gas having salt particles dispersed therein into a dry collector meAns by which the salt particles and any other dispersed solids are removed from the gas stream; c. feeding the gas from which the solids have been removed into a scrubber wherein the acidic component of the gas is absorbed into a scrubbing solution; d. discharging the scrubbed gas from the scrubber and raising the pH of the scrubbing solution containing the absorbed acidic component by admixing therewith a salt-forming basic chemical by which a salt of the acid and basic chemical is formed in dispersion within the scrubbing solution; and e. feeding the salt-containing aqueous scrubbing solution to the evaporative cooler of step (a).
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) | 1978-12-29 | 1979-06-30 | 1979-12-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-12-29 | 1983-06-30 | 1983-12-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-12-29 | 1987-06-30 | 1987-12-30 | $7700.00 | Window Closed / Lapsed |