US3660040A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Gaseous oxide recovery
Assignee: CHARLES I HARDING
•
Filing: 1969-04-10
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Granted: 1972-05-02
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Expires: 1989-04-10
Abstract
Abstract An apparatus for removal of sulfur and nitrogen dioxide from gases which may comprise a plurality of scrubbers and an ion exchange resin bed successively receiving gas containing SO2 and nitrogen oxides and contacting the same with absorbing liquor and the resin bed, means receiving the absorbing liquor from at least one of said scrubbers for removing and concentrating SO2 from at least a portion of said absorbing liquor, and means for concentrating SO2 and nitrogen oxides directly in said resin bed, desorbing means receiving the concentrated SO2 and nitrogen oxides and placing it in gaseous condition and recovery means for gaseous SO2 connected to said desorbing means and receiving gaseous SO2 therefrom, recovering nitrogen oxides in soluble nitrate form.
Inventors
- 👤 Charles I Harding
- 👤 Lamgr V Russell
- 👤 W Malcolm Steeves
- 👤 Irwin R Higgins
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 08:36
CPC Classifications
B; B01; B01D; B01D53/00; B01D53/34; B01D53/46; B01D53/60; B01J; B01J41/00; C; C01; C01B; C01B17/00; C01B17/48; C01B17/50; C01B17/60; Y; Y02; Y02A; Y02A50/00; Y02A50/20
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
57 words
An apparatus as claimed in claim 1 wherein at least two scrubbers are provided, one delivering absorbing liquid to the ion exchanger and the other to said desorbing chamber, the regeneration liquid is contacted with the gas containing SO2 in said other scrubber not delivering liquid to the ion exchanger, but delivering liquid to said desorbing chamber.
Claim 2
Dependent Claim
18 words
An apparatus as claimed in claim 1 wherein the SO2 recovery means includes cooling, drying and compressing means.
Claim 3
Dependent Claim
44 words
An apparatus as claimed in claim 1 wherein a scavenging ion exchange resin bed is connected to the last scrubber in line receiving gas therefrom for contact with a resin ion exchange mass, whereby residual SO2 is concentrated directly and simultaneously on the resin.
Claim 4
Dependent Claim
37 words
An apparatus as claimed in claim 1 wherein two successive scrubbers are provided, one delivering scrubbing liquid to said ion exchanger and the other receiving regeneration liquor from the ion exchanger for contacting the gas containing SO2.
Claim 5
Independent Claim
117 words
An apparatus for removal of sulfur dioxide from gases comprising a plurality of scrubbers in series successively receiving gas containing sulfur dioxide to be removed, means delivering an abSorbing liquor to said scrubbers for contacting the gas with said absorbing liquor, means receiving absorbing liquid discharged from at least one of said scrubbers for removing and concentrating SO2 from at least a portion of said absorbing liquor, means wherein the concentrated liquor is used as scrubbing liquor in at least one of said scrubbers for concentrating SO2 as sulfite, desorbing means receiving the concentrated sulfite and placing it in gaseous condition and recovery means for gaseous SO2 connected to said desorbing means and receiving gaseous SO2 therefrom.
Claim 6
Dependent Claim
22 words
An apparatus as claimed in claim 6 wherein the means for removing and concentrating SO2 from the absorbing liquor is a centrifuge.
Claim 7
Dependent Claim
22 words
An apparatus as claimed in claim 6 wherein the means for removing and concentrating SO2 from absorbing liquor is an ion exchanger.
Claim 8
Dependent Claim
42 words
An apparatus as claimed in claim 6 wherein a scavenging ion exchange resin bed is connected to the last scrubber in line receiving gas therefrom for contact with a resin ion exchange mass, whereby residual SO2 is concentrated directly on the resin.
Claim 9
Independent Claim
116 words
An apparatus for removal of sulfur dioxide from gases comprising a plurality of scrubbers successively receiving gas containing sulfur dioxide to be removed, means for delivering and absorbing liquor to said scrubbers for contacting the gas with said absorbing liquor, an ion exchanger receiving absorbing liquor discharged from at least one scrubber and removing and concentrating sulfur dioxide therefrom by ion exchange, means for delivering an ion exchange regeneration liquid to said ion exchanger, means in the system whereby ion exchange regeneration liquid is contacted with the gas containing SO2 and collecting means collecting the regeneration liquid in spent form to be subsequently used as saleable product to sulfite pulp mills as a source of sulfur.
Claim 10
Independent Claim
137 words
An apparatus for removal of at least one of the group consisting of sulfur dioxide and nitrogen oxides from gases, comprising a single scrubber and a single ion exchange resin scavenger in series with said scrubber successively receiving gas containing at least one of the group consisting of sulfur dioxide and nitrogen oxides to be removed and contacting the same with absorbing liquid, an ion exchanger receiving absorbing liquor discharged from the scrubber and removing and concentrating sulfur dioxide therefrom by ion exchange, the same ion exchanger receiving exchange resin from the scavenger which is loaded with sulfur dioxide and nitrogen oxides, and a liquid regeneration system connected to said ion exchanger for removing at least one of the group consisting of sulfur dioxide and nitrogen oxides from the ion exchange resin whereby the resin is regenerated.
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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) | 1975-05-02 | 1975-11-01 | 1976-05-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-05-02 | 1979-11-01 | 1980-05-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-05-02 | 1983-11-01 | 1984-05-02 | $7700.00 | Window Closed / Lapsed |