US4370306A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for separation of traces of gaseous contaminants from waste gases by chemical absorption
Assignee: Society for Chemical Engineering and Biotechnology
•
Filing: 1980-03-31
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Granted: 1983-01-25
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Expires: 2000-03-31
Abstract
Abstract In the separation of traces of halogens and sulfur from a halogen- and/or sulfur-containing gas stream wherein the gas stream is contacted with a wash liquid to absorb the halogens and sulfur, the improvement which comprises including in the wash liquid heavy metal ions capable of forming difficultly soluble halides and sulfides. Preferably the heavy metal ions are silver or copper, and the insoluble heavy metal sulfide and/or halide is removed from the wash liquid which is recirculated. Almost quantitative removal is achieved in as little as 1 second of gas-wash liquid contact.
Inventors
- 👤 Kurt Kirchner
- 👤 Wolfgang Litzenburger
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 08:30
CPC Classifications
B; B01; B01D; B01D53/00; B01D53/34; B01D53/46; B01D53/48; B01D53/68; B01D53/70
Claims Analysis
Total Claims: 19
Claim 1
Independent Claim
94 words
In the separation of traces of halogens and sulfur from a halogen- and/or sulfur-containing gas stream wherein the gas stream is contacted with a wash liquid to absorb the halogens and sulfur, the improvement which comprises using a gas stream containing as contaminant at least one of a mercaptan, H 2 S, HCl, HBr, HI, chlorine, bromine and iodine, and introducing into the wash liquid a pair of electrodes, the anode consisting of a heavy metal which as cation is capable of forming difficultly soluble halides or sulfides with the contaminants that are present.
Claim 2
Dependent Claim
94 words
In the separation of traces of halogens and sulfur from a halogen- and/or sulfur-containing gas stream wherein the gas stream is contacted with a wash liquid to absorb the halogens and sulfur, the improvement which comprises using a gas stream containing as contaminant at least one of a mercaptan, H 2 S, HCl, HBr, HI, chlorine, bromine and iodine, and introducing into the wash liquid a pair of electrodes, the anode consisting of a heavy metal which as cation is capable of forming difficultly soluble halides or sulfides with the contaminants that are present.
Claim 3
Dependent Claim
15 words
A process according to claim 1, wherein the heavy metal anode is silver or copper.
Claim 4
Dependent Claim
17 words
A process according to claim 1, wherein the gas stream is continuously supplied to the wash liquid.
Claim 5
Dependent Claim
28 words
A process according to claim 1, wherein the gas stream contains sulfur and the wash liquid is contacted with ozone thereby to react with the heavy metal sulfides.
Claim 6
Dependent Claim
12 words
A process according to claim 1, wherein the wash liquid comprises water.
Claim 7
Dependent Claim
24 words
A process according to claim 1, wherein the gas stream contains halogen and the wash liquid comprises a neutral buffered solution of sodium bromide.
Claim 8
Dependent Claim
28 words
A process according to claim 1, wherein the heavy metal halide and/or sulfide is removed from the wash liquid, and the wash liquid is recirculated for further absorption.
Claim 9
Dependent Claim
23 words
A process according to claim 1, wherein the contact time between the gas stream and wash liquid is at most about 3 seconds.
Claim 10
Dependent Claim
58 words
A process according to claim 1, wherein the wash liquid is aqueous and the gas stream is continuously supplied thereto, the contact time between the gas stream and wash liquid is at most about 3 seconds, the silver or copper halide and/or sulfide is removed from the wash liquid, and the wash liquid is recirculated for further absorption.
Claim 11
Dependent Claim
78 words
In the separation of traces of sulfur from a sulfur-containing gas stream is contacted with a wash liquid to absorb the sulfur, the improvement which comprises using a gas stream containing as contaminant at least one of a mercaptan and H 2 S, including in the wash liquid heavy metal ions capable of forming difficultly soluble sulfides with the contaminants that are present, and contacting the wash liquid with ozone thereby to react with the heavy metal sulfides.
Claim 12
Dependent Claim
78 words
In the separation of traces of sulfur from a sulfur-containing gas stream is contacted with a wash liquid to absorb the sulfur, the improvement which comprises using a gas stream containing as contaminant at least one of a mercaptan and H 2 S, including in the wash liquid heavy metal ions capable of forming difficultly soluble sulfides with the contaminants that are present, and contacting the wash liquid with ozone thereby to react with the heavy metal sulfides.
Claim 13
Dependent Claim
17 words
A process according to claim 10, wherein the gas stream is continuously supplied to the wash liquid.
Claim 14
Dependent Claim
42 words
A process according to claim 10, wherein the heavy metal ions are introduced into the wash liquid by immersing in the liquid a pair of electrodes, the anode of which comprises the heavy metal, and passing an electric current through the solution.
Claim 15
Dependent Claim
15 words
A process according to claim 10, wherein the heavy metal anode is silver or copper.
Claim 16
Dependent Claim
12 words
A process according to claim 10, wherein the wash liquid comprises water.
Claim 17
Dependent Claim
26 words
A process according to claim 10, wherein the heavy metal sulfide is removed from the wash liquid, and the wash liquid is recirculated for further absorption.
Claim 18
Dependent Claim
23 words
A process according to claim 10, wherein the contact time between the gas stream and wash liquid is at most about 3 seconds.
Claim 19
Dependent Claim
63 words
A process according to claim 10, wherein the wash liquid is aqueous and ions of silver or copper are continuously supplied thereto along with the gas stream, the contact time between the gas stream and wash liquid is at most about 3 seconds, the silver or copper sulfide is removed from the wash liquid, and the wash liquid is recirculated for further absorption.
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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) | 1986-01-24 | 1986-07-26 | 1987-01-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1990-01-24 | 1990-07-26 | 1991-01-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1994-01-24 | 1994-07-26 | 1995-01-25 | $7700.00 | Window Closed / Lapsed |