US4101296A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Ozone decomposition and electrodesorption process
Assignee: WR Grace and Co
•
Filing: 1977-04-20
•
Granted: 1978-07-18
•
Expires: 1997-04-20
Abstract
Abstract An ozone decomposition system wherein moist ozone-containing gas is contacted with a bed of active zeolite molecular sieve particles for converting ozone, which comprises means for reactivating the bed by directly applying to the zeolite particles a high-voltage low-frequency electrical field having sufficient potential gradient to separate sorbed moisture as molecular water.
Inventors
- 👤 Frank Eugene Lowther
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 15:01
CPC Classifications
B; B01; B01J; B01J29/00; B01J29/90; B01D; B01D53/00; B01D53/34; B01D53/46; B01D53/66; B01J20/00; B01J20/30; B01J20/34; B01J20/3408; C; C01; C01B; C01B13/00; C01B13/02; C01B13/0203; Y; Y02; Y02A; Y02A50/00; Y02A50/20; Y02P; Y02P20/00; Y02P20/50; Y02P20/584
Claims Analysis
Total Claims: 14
Claim 1
Independent Claim
82 words
A method for decomposing ozone which comprises: (a) contacting a gas mixture which includes ozone and water vapor with a bed of crystalline alumino-silicate zeolite, said zeolite being active for the decomposition of ozone; and (b) maintaining the activity of said zeolite bed by the application of a 0-10 3 Hz electrical field of at least 0.2 Kv/cm across the bed to maintain a current density of about 0.01 to 100 microamps/cm 2 to remove water from said bed as molecular water.
Claim 2
Independent Claim
82 words
A method for decomposing ozone which comprises: (a) contacting a gas mixture which includes ozone and water vapor with a bed of crystalline alumino-silicate zeolite, said zeolite being active for the decomposition of ozone; and (b) maintaining the activity of said zeolite bed by the application of a 0-10 3 Hz electrical field of at least 0.2 Kv/cm across the bed to maintain a current density of about 0.01 to 100 microamps/cm 2 to remove water from said bed as molecular water.
Claim 3
Dependent Claim
22 words
The method of claim 1 wherein said zeolite is selected from the group consisting of Type A, L, X and Y zeolites.
Claim 4
Dependent Claim
24 words
The method of claim 1 wherein the particle size of said zeolite is in the range of from about 1 micron to 500 microns.
Claim 5
Dependent Claim
18 words
The method of claim 1 wherein the activity of said bed is maintained continuously during the decomposition process.
Claim 6
Dependent Claim
29 words
The method of claim 1 wherein said activity is maintained by periodically applying said electrical field and conducting a gas through said bed to remove water from said bed.
Claim 7
Dependent Claim
16 words
The method of claim 1 wherein the temperature of said bed is maintained above -50° C.
Claim 8
Dependent Claim
16 words
The method of claim 1 wherein said gas mixture is off-gas from a water treatment process.
Claim 9
Dependent Claim
85 words
In an improved method for decomposing ozone mixed with a moisture containing gas stream wherein the stream is contacted with a crystalline aluminosilicate zeolite which is active for the decomposition of ozone, the improvement comprising maintaining the ozone decomposition activity of the zeolite by the application of a 0-10 3 Hz electrical field of at least 0.2 Kv/cm across the zeolite to maintain a current density of about 0.01 to 100 microamps/cm 2 , whereby water is removed from said zeolite substantially as molecular water.
Claim 10
Dependent Claim
85 words
In an improved method for decomposing ozone mixed with a moisture containing gas stream wherein the stream is contacted with a crystalline aluminosilicate zeolite which is active for the decomposition of ozone, the improvement comprising maintaining the ozone decomposition activity of the zeolite by the application of a 0-10 3 Hz electrical field of at least 0.2 Kv/cm across the zeolite to maintain a current density of about 0.01 to 100 microamps/cm 2 , whereby water is removed from said zeolite substantially as molecular water.
Claim 11
Dependent Claim
15 words
The method of claim 8 wherein said electrical field is continuously applied to said zeolite.
Claim 12
Dependent Claim
26 words
The method of claim 8 wherein said zeolite is a particulate zeolite bed selected from the group consisting of Type A, L, X and Y zeolites.
Claim 13
Dependent Claim
15 words
The method of claim 8 wherein said electrical field is applied periodically to said zeolite.
Claim 14
Dependent Claim
15 words
The method of claim 8 wherein said stream is off-gas from a water treatment process.
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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) | 1981-07-17 | 1982-01-16 | 1982-07-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1985-07-17 | 1986-01-16 | 1986-07-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1989-07-17 | 1990-01-16 | 1990-07-18 | $7700.00 | Window Closed / Lapsed |