Patent US4045316A successfully refreshed from Google Patents.
US4045316A
Expired / Lapsed
US
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Photochemical process for decontaminating gaseous or vaporous streams
Assignee: Shintech Inc
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Filing: 1975-05-27
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Granted: 1977-08-30
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Expires: 1995-05-27
Abstract
Abstract A process for photochemically treating hydrocarbons and halogenated or partially oxidized hydrocarbons in a gaseous or vaporous mixture, by exposing the mixture to ultraviolet light, preferably of relatively short wavelength in the presence of oxygen or its allotropes, in order to oxidize the hydrocarbons to very simple compounds.
Inventors
- 👤 Robert W. Legan
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 19:59
CPC Classifications
B; B01; B01D; B01D53/00; B01D53/34; B01D53/46; B01D53/72; B01D53/68; B01J; B01J19/00; B01J19/08; B01J19/12; B01J19/122; B01J19/123
Claims Analysis
Total Claims: 14
Claim 1
Independent Claim
64 words
A process for photochemically treating a gaseous or vaporous stream containing an oxidizable contaminant, said process comprising exposing said contaminant to ultraviolet radiation from a source of radiation emitting ultraviolet wavelengths shorter than 2100 A in the presence of ozone thereby oxidizing said contaminant to form simple, gaseous products, said ozone being in addition to any ozone formed by said source of ultraviolet radiation.
Claim 2
Dependent Claim
64 words
A process for photochemically treating a gaseous or vaporous stream containing an oxidizable contaminant, said process comprising exposing said contaminant to ultraviolet radiation from a source of radiation emitting ultraviolet wavelengths shorter than 2100 A in the presence of ozone thereby oxidizing said contaminant to form simple, gaseous products, said ozone being in addition to any ozone formed by said source of ultraviolet radiation.
Claim 3
Dependent Claim
18 words
The process of claim 1 wherein said ultraviolet radiation includes components having a wavelength of about 1849 A.
Claim 4
Dependent Claim
11 words
The process of claim 2 wherein said contaminant comprises vinyl chloride.
Claim 5
Dependent Claim
21 words
The process of claim 1 wherein ozone is present in an amount at least equal to the weight of said contaminant.
Claim 6
Dependent Claim
11 words
The process of claim 4 wherein said contaminant comprises vinyl chloride.
Claim 7
Dependent Claim
26 words
The process of claim 1 wherein said ultraviolet radiation comprises wavelengths of about 1849 A and said oxidation takes place in the presence of atmospheric oxygen.
Claim 8
Dependent Claim
28 words
The process of claim 6 wherein said contaminant comprises vinyl chloride and ozone is present in an amount at least equal to the weight of said vinyl chloride.
Claim 9
Dependent Claim
15 words
the process of claim 1 wherein said oxidation takes place in the presence of oxygen.
Claim 10
Dependent Claim
30 words
The process of claim 1 wherein said contaminant is present in said stream in an amount of from 10 ppm by volume to 80 percent by volume of said stream.
Claim 11
Dependent Claim
17 words
The process of claim 1 wherein said contaminant is irradiated under ambient conditions of temperature and pressure.
Claim 12
Dependent Claim
11 words
The process of claim 1 wherein said contaminant comprises vinyl chloride.
Claim 13
Dependent Claim
48 words
The process of claim 1 wherein said contaminant is a member selected from the group consisting of a. saturated and unsaturated hydrocarbons containing 2-8 carbon atoms, b. halogen-substituted saturated and unsaturated hydrocarbons containing 2-8 carbon atoms, and c. partially oxidized variants of said hydrocarbons and said halogen-substituted hydrocarbons.
Claim 14
Dependent Claim
24 words
The process of claim 1 wherein said ultraviolet radiation is provided with energy densities of from 10 watts to 2000 watts per cubic foot.
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) | 1980-08-29 | 1981-02-28 | 1981-08-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-08-29 | 1985-02-28 | 1985-08-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-08-29 | 1989-02-28 | 1989-08-30 | $7700.00 | Window Closed / Lapsed |