US4201751A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Gas purification
Assignee: Individual
•
Filing: 1977-10-21
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Granted: 1980-05-06
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Expires: 1997-10-21
Abstract
Abstract Pulverent solid sorption agent is injected into and, optionally, admixed with a stream of noxious-contaminant-containing gas and then separated from such gas. The solid sorption agent comprises an alkali-metal and/or alkaline-earth-metal compound and advantageously contains iron-III-oxide; such agent is preferably in the form of dust developed during production of iron or steel.
Inventors
- 👤 Heinz Holter
- 👤 Heinz Gresch
- 👤 Heinrich Igelbuscher
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 17:09
CPC Classifications
B; B01; B01J; B01J20/00; B01J20/02; B01J20/04; B01J20/041; B01D; B01D53/00; B01D53/02; B01D53/34; B01D53/46; B01D53/60; B01J20/0203; B01J20/0225; B01J20/0229; B01J20/06; B01J20/10; B01J20/103; B01J20/106; B01J20/28; B01J20/28002; B01J20/28004; B01J20/30; B01J20/3085; B01J20/32; B01J20/3202; B01J20/3204; B01J20/3231; B01J20/3234; B01J20/3236; C; C10; C10B; C10B53/00; B01J2220/00; B01J2220/40; B01J2220/42; B01J2220/50; B01J2220/56; F; F23; F23G; F23G2201/00; F23G2201/30; F23G2201/301; F23G2201/303
Claims Analysis
Total Claims: 16
Claim 1
Independent Claim
53 words
A combination of (a) an absorption agent and (b) carrier, wherein the absorption agent comprises dust developed during iron or steel production and contains Fe 2 O 3 in combination with a member selected from the group consisting of an alkali-metal oxide and an alkaline-earth-metal oxide and wherein the carrier is expanded perlite.
Claim 2
Dependent Claim
53 words
A combination of (a) an absorption agent and (b) carrier, wherein the absorption agent comprises dust developed during iron or steel production and contains Fe 2 O 3 in combination with a member selected from the group consisting of an alkali-metal oxide and an alkaline-earth-metal oxide and wherein the carrier is expanded perlite.
Claim 3
Dependent Claim
51 words
A combination according to claim 1 which comprises: (a) Fe 2 O 3 , (b) a member selected from the group consisting of alkali-metal-oxide and alkaline-earth metal oxide, and (c) a member selected from the group consisting of calcium hydroxide, fine white lime, bog iron ore and a heavy metal salt.
Claim 4
Dependent Claim
12 words
A combination according to claim 2 wherein component (c) is calcium hydroxide.
Claim 5
Dependent Claim
13 words
A combination according to claim 2 wherein component (c) is fine white lime.
Claim 6
Dependent Claim
13 words
A combination according to claim 2 wherein component (c) is bog iron ore.
Claim 7
Dependent Claim
14 words
A combination according to claim 2 wherein component (c) is a heavy metal salt.
Claim 8
Dependent Claim
9 words
A combination according to claim 2 in pelletized form.
Claim 9
Dependent Claim
19 words
A combination according to claim 1 wherein the absorption agent is pulverulent and the carrier is moistened expanded perlite.
Claim 10
Dependent Claim
15 words
A combination according to claim 8 wherein the expanded perlite is moistened with caustic soda.
Claim 11
Dependent Claim
12 words
A combination according to claim 1 wherein the absorption agent comprises moisture.
Claim 12
Dependent Claim
86 words
A process for removing contaminants from contaminated gas which comprises: (a) introducing into and thus contacting a current of the contaminated gas with a combination of (1) a solid-form absorption agent comprising dust developed during iron or steel production and containing Fe 2 O 3 in combination with a member selected from the group consisting of an alkali-metal oxide and an alkaline-earth-metal oxide and (2) expanded-perlite carrier, (b) intimately admixing the absorption agent with the gas, and then (c) separating the absorption agent from the gas.
Claim 13
Dependent Claim
86 words
A process for removing contaminants from contaminated gas which comprises: (a) introducing into and thus contacting a current of the contaminated gas with a combination of (1) a solid-form absorption agent comprising dust developed during iron or steel production and containing Fe 2 O 3 in combination with a member selected from the group consisting of an alkali-metal oxide and an alkaline-earth-metal oxide and (2) expanded-perlite carrier, (b) intimately admixing the absorption agent with the gas, and then (c) separating the absorption agent from the gas.
Claim 14
Dependent Claim
13 words
A process according to claim 11 wherein the carrier is moistened expanded perlite.
Claim 15
Dependent Claim
36 words
A process according to claim 11 wherein step (b) comprises causing sufficient turbulence in the resulting gas stream to produce intensive and intimate contact between the absorption agent, the gas and any contaminants in the gas.
Claim 16
Dependent Claim
50 words
A process according to claim 11 wherein step (b) comprises passing the gas stream resulting from step (a) through tube-shaped sections with venturi-like inserts to cause turbulence in the gas stream and thus produce intensive and intimate contact between the absorption agent, the gas and any contaminants in the gas.
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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) | 1983-05-06 | 1983-11-05 | 1984-05-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1987-05-06 | 1987-11-05 | 1988-05-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1991-05-06 | 1991-11-05 | 1992-05-06 | $7700.00 | Window Closed / Lapsed |