US4481092A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Photo-initiated epoxidation of allyl chloride
Assignee: Novartis AG
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Filing: 1983-06-08
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Granted: 1984-11-06
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Expires: 2003-06-08
Abstract
Abstract Epichlorohydrin is prepared by the epoxidation of allyl chloride by a process which comprises irradiating an oxygen-saturated solution of allyl chloride in an aprotic solvent in the presence of an effective amount of an alpha-diketone sensitizer with the radiation of a 450 watt medium-pressure mercury lamp. Propylene oxide is prepared by a similar process by the epoxidation of propylene.
Inventors
- 👤 Kevin T. Mansfield
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 04:57
CPC Classifications
C; C07; C07D; C07D301/00; C07D301/02; C07D301/03; C07D301/04; C07D301/06
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
59 words
A method for the preparation of epichlorohydrin by the epoxidation of allyl chloride which comprises irradiating with the radiation of a 450 watt medium-pressure mercury lamp an oxygen-saturated solution of allyl chloride in an aprotic solvent in the presence of an effective amount of an alpha-diketone sensitizer for sufficient time to effect epoxidation of the allyl chloride to epichlorohydrin.
Claim 2
Independent Claim
59 words
A method for the preparation of epichlorohydrin by the epoxidation of allyl chloride which comprises irradiating with the radiation of a 450 watt medium-pressure mercury lamp an oxygen-saturated solution of allyl chloride in an aprotic solvent in the presence of an effective amount of an alpha-diketone sensitizer for sufficient time to effect epoxidation of the allyl chloride to epichlorohydrin.
Claim 3
Dependent Claim
15 words
A method according to claim 1 wherein the alpha-diketone sensitizer is biacetyl, benzil or 1-phenyl-1,2-propanedione.
Claim 4
Dependent Claim
14 words
A method according to claim 2 wherein the alpha-diketone sensitizer is biacetyl or benzil.
Claim 5
Dependent Claim
15 words
A method according to claim 1 wherein the aprotic solvent is benzene or methylene chloride.
Claim 6
Dependent Claim
13 words
A method according to claim 4 wherein the aprotic solvent is methylene chloride.
References Cited (Backward Citations)
US4383904A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1987-11-06 | 1988-05-07 | 1988-11-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1991-11-06 | 1992-05-07 | 1992-11-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1995-11-06 | 1996-05-07 | 1996-11-06 | $7700.00 | Window Closed / Lapsed |