US4029484A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Mist scrubbing of waste halide effluent
Assignee: EIDP Inc
•
Filing: 1976-01-21
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Granted: 1977-06-14
•
Expires: 1996-01-21
Abstract
Abstract A process for cleansing waste halides from a waste gas stream containing waste halide impurities wherein the waste gas stream is contacted with an aqueous acid mist selected from HCl, HNO 3 , HBr, HF, and HI, or an aqueous halide salt mist selected from halide salts of calcium, sodium, ammonium, lithium, barium, and iron, with the provisos that the temperature of the combined gas stream and aqueous mist is about -5° to 70° C., the water vapor pressure of the aqueous mist is about 0.05-5.0 mm Hg, and the ratio of surface area of the aqueous mist to the weight of waste halide is at least 2 square meters surface area of aqueous mist per gram of waste halide. Then the gas stream is separated from the acid and the gas stream is scrubbed with water.
Inventors
- 👤 Timothy Allen Fitzpatrick
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 19:11
CPC Classifications
B; B01; B01D; B01D53/00; B01D53/34; B01D53/46; B01D53/68
Claims Analysis
Total Claims: 19
Claim 1
Independent Claim
127 words
In a process of treating a mixture of halide vapors to remove the vaporous halides of titanium, aluminum, vanadium, silicon, tin, magnesium, zinc, antimony, sulfur, phosphorus, and ammonium and separating said vaporous halides from acid halides in a waste gas stream followed by the waste gas stream the scrubbing of the improvement comprising the removal of said vaporous halides without the formation of particulates from said vaporous halides during separation by A. generating an absorptive aqueous mist containing water in which is dissolved HCl, HNO 3 , HBr, HF, HI, or one or more halide salts of calcium, sodium, ammonia, lithium, barium, and iron; B. maintaining the temperature of the combined waste gas streams and aqueous mist at a temperature of from -5° C. to 70° C.;
Claim 2
Dependent Claim
127 words
In a process of treating a mixture of halide vapors to remove the vaporous halides of titanium, aluminum, vanadium, silicon, tin, magnesium, zinc, antimony, sulfur, phosphorus, and ammonium and separating said vaporous halides from acid halides in a waste gas stream followed by the waste gas stream the scrubbing of the improvement comprising the removal of said vaporous halides without the formation of particulates from said vaporous halides during separation by A. generating an absorptive aqueous mist containing water in which is dissolved HCl, HNO 3 , HBr, HF, HI, or one or more halide salts of calcium, sodium, ammonia, lithium, barium, and iron; B. maintaining the temperature of the combined waste gas streams and aqueous mist at a temperature of from -5° C. to 70° C.;
Claim 3
Dependent Claim
28 words
C. maintaining the water vapor pressure of the absorptive aqueous mist at a vapor pressure of from 0.05-5.0 mm Hg prior to contact with the waste gas stream;
Claim 4
Dependent Claim
28 words
C. maintaining the water vapor pressure of the absorptive aqueous mist at a vapor pressure of from 0.05-5.0 mm Hg prior to contact with the waste gas stream;
Claim 5
Dependent Claim
56 words
D. controlling the particle size of the aqueous absorptive mist so that the ratio of the surface area of the absorptive aqueous mist to the weight of the waste halide to be removed is at least 2 square meters surface area of the absorptive aqueous mist per gram of waste halide present in the gas stream;
Claim 6
Dependent Claim
56 words
D. controlling the particle size of the aqueous absorptive mist so that the ratio of the surface area of the absorptive aqueous mist to the weight of the waste halide to be removed is at least 2 square meters surface area of the absorptive aqueous mist per gram of waste halide present in the gas stream;
Claim 7
Dependent Claim
20 words
E. contacting the gas stream containing the vaporous halide with the absorptive aqueous mist to absorb said vaporous halide; and
Claim 8
Dependent Claim
20 words
E. contacting the gas stream containing the vaporous halide with the absorptive aqueous mist to absorb said vaporous halide; and
Claim 9
Dependent Claim
10 words
F. separating the gas stream from the aqueous absorptive mist.
Claim 10
Dependent Claim
10 words
F. separating the gas stream from the aqueous absorptive mist.
Claim 11
Dependent Claim
25 words
The process of claim 1 wherein the ratio between the surface area of the aqueous mist to the weight of waste halide is about 12-16.
Claim 12
Dependent Claim
14 words
The process of claim 2 wherein the HCl is dissolved in the aqueous mist.
Claim 13
Dependent Claim
14 words
The process of claim 2 wherein sodium chloride is dissolved in the aqueous mist.
Claim 14
Dependent Claim
12 words
The process of claim 2 wherein the waste halide is titanium tetrachloride.
Claim 15
Dependent Claim
13 words
The process of claim 5 wherein HCl is dissolved in the aqueous mist.
Claim 16
Dependent Claim
14 words
The process of claim 5 wherein sodium chloride is dissolved in the aqueous mist.
Claim 17
Dependent Claim
12 words
The process claim 2 wherein the waste halide impurity is silicon tetrachloride.
Claim 18
Dependent Claim
13 words
The process of claim 8 wherein HCl is dissolved in the aqueous mist.
Claim 19
Dependent Claim
14 words
The process of claim 8 wherein sodium chloride is dissolved in the aqueous mist.
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) | 1980-06-13 | 1980-12-13 | 1981-06-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-06-13 | 1984-12-13 | 1985-06-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-06-13 | 1988-12-13 | 1989-06-14 | $7700.00 | Window Closed / Lapsed |