US4169210A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Oxidation of diethylbenzenes
Assignee: Cosden Technology Inc
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Filing: 1974-08-12
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Granted: 1979-09-25
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Expires: 1994-08-12
Abstract
Abstract A process for the oxidation of diethylbenzene comprising contacting an unpurified diethylbenzene feedstock with from about 0.01% to about 5.0% by weight of an alkaline earth metal oxide and concurrently and/or in a separate subsequent step contacting the diethylbenzene feedstock with a molecular oxygen-containing gas at a temperature between about 100° C. and 170° C. This process enables oxidation of diethylbenzenes to diethylbenzene hydroperoxide with a high degree of selectivity without the necessity of prior purification of the diethylbenzene feedstock, for example, by distillation or absorption techniques.
Inventors
- 👤 William E. Archibald
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 10:46
CPC Classifications
C; C07; C07C; C07C409/00; C07C409/02; C07C409/04; C07C409/08; C07C407/00
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
132 words
A process for the oxidation of diethylbenzene which comprises contacting an unpurified diethylbenzene feedstock with from about 0.01 to 5% by weight of an agent consisting essentially of an alkaline earth metal oxide in finely divided form having a particle size between about 50μ and 1 inch by passing said feedstock through a first reaction vessel containing a bed of said alkaline earth metal oxide, in a pretreatment stage conveying said pre-treated feedstock to a second reaction vessel and contacting said feedstock with a molecular oxygen-containing gas at a temperature between about 100° C. and 170° C. in said second vessel whereby said diethylbenzenes are oxidized to diethylbenzene monohydroperoxide with high selectivity without the necessity of prior purification of the diethylbenzene feedstock to remove therefrom impurities normally detrimental to said oxidation reaction.
Claim 2
Dependent Claim
132 words
A process for the oxidation of diethylbenzene which comprises contacting an unpurified diethylbenzene feedstock with from about 0.01 to 5% by weight of an agent consisting essentially of an alkaline earth metal oxide in finely divided form having a particle size between about 50μ and 1 inch by passing said feedstock through a first reaction vessel containing a bed of said alkaline earth metal oxide, in a pretreatment stage conveying said pre-treated feedstock to a second reaction vessel and contacting said feedstock with a molecular oxygen-containing gas at a temperature between about 100° C. and 170° C. in said second vessel whereby said diethylbenzenes are oxidized to diethylbenzene monohydroperoxide with high selectivity without the necessity of prior purification of the diethylbenzene feedstock to remove therefrom impurities normally detrimental to said oxidation reaction.
Claim 3
Dependent Claim
27 words
The process as defined by claim 1, wherein the diethylbenzene feedstock is contacted with from about 0.05 to 1% by weight of said alkaline earth metal oxide.
Claim 4
Dependent Claim
23 words
The process as defined by claim 1, wherein the oxidation is carried out at a temperature between about 130° C. and 150° C.
Claim 5
Dependent Claim
32 words
The process as defined by claim 3, wherein the oxidation is carried out by starting the reaction at about 150° C. and then progressively decreasing the reaction temperature to about 140° C.
Claim 6
Dependent Claim
16 words
The process as defined by claim 1, wherein the alkaline earth metal oxide is magnesium oxide.
Claim 7
Dependent Claim
45 words
The process as defined by claim 1, wherein the oxidation is carried out in the presence of from about 0 to 5% by weight based on the diethylbenzene of a free radical generating initiator selected from the group consisting of peroxy compounds and diazo compounds.
Claim 8
Dependent Claim
24 words
The process as defined by claim 6, wherein the initiator is selected from the group consisting of perbenzoates, tertiary-butyl peroxide, diethylbenzene hydroperoxide and azobiscyclohexanenitrile.
Claim 9
Dependent Claim
27 words
The process as defined by claim 1, wherein the amount of oxygen in the vent gas issuing from the oxidation is maintained below about 20% by volume.
Claim 10
Dependent Claim
17 words
The process as defined by claim 1, wherein said process is carried out in a continuous manner.
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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) | 1982-09-24 | 1983-03-26 | 1983-09-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1986-09-24 | 1987-03-26 | 1987-09-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1990-09-24 | 1991-03-26 | 1991-09-25 | $7700.00 | Window Closed / Lapsed |