US3998937A
Expired / Lapsed
US
⏱️ 0.0 years remaining
1-Alkyl-substituted-1,2,3,4-tetrahydroanthraquinones
Assignee: EIDP Inc
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Filing: 1976-04-30
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Granted: 1976-12-21
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Expires: 1996-04-30
Abstract
Abstract 1-Alkyl and 1,3-dialkyl substituted-1,2,3,4-tetrahydroanthraquinones are provided which may also be alkyl substituted in the 6- and/or 7- position. These compounds are provided by condensing a naphthoquinone with an alkyl-substituted butadiene dimer, catalytically hydrogenating the adduct, then oxidizing the resulting hexahydro compound to the desired tetrahydroanthraquinone. Alternatively, the condensation product may be oxidized with a cupric compound or with air plus a weak base, and this compound catalytically hydrogenated and then oxidized to the corresponding tetrahydroanthraquinone. The compounds of this invention exhibit superior solubility in solvents commonly used in the cyclic process for manufacturing H 2 O 2 and thus enhance H 2 O 2 production.
Inventors
- 👤 Lawrence G. Vaughan
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 19:39
CPC Classifications
C; C01; C01B; C01B15/00; C01B15/01; C01B15/022; C01B15/023
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
62 words
In a cyclic process for the production of hydrogen peroxide by oxidation and reduction of alkylated anthraquinones dissolved in mixed solvents, the improvement comprising employing as an anthraquinone an alkyl-substituted-1,2,3,4-tetrahydroanthraquinone of the formula ##STR10## wherein R 1 is hydrogen or an alkyl group containing 1-10 carbon atoms and R 2 and R 3 are hydrogen or alkyl groups containing 1-6 carbon atoms.
Claim 2
Dependent Claim
62 words
In a cyclic process for the production of hydrogen peroxide by oxidation and reduction of alkylated anthraquinones dissolved in mixed solvents, the improvement comprising employing as an anthraquinone an alkyl-substituted-1,2,3,4-tetrahydroanthraquinone of the formula ##STR10## wherein R 1 is hydrogen or an alkyl group containing 1-10 carbon atoms and R 2 and R 3 are hydrogen or alkyl groups containing 1-6 carbon atoms.
Claim 3
Dependent Claim
17 words
The process of claim 1 in which R 1 is an alkyl group containing 1-3 carbon atoms.
Claim 4
Dependent Claim
14 words
The process of claim 1 in which R 2 and R 3 are hydrogen.
Claim 5
Dependent Claim
30 words
The process of claim 1 in which the alkyl-substituted-1,2,3,4-tetrahydroanthraquinone is employed in admixture with another anthraquinone, a tetrahydroanthraquinone free from alkyl substitution in the tetrahydro ring or mixture of these.
Claim 6
Dependent Claim
11 words
The process of claim 4 in which the alkyl-substituted-1,2,3,4-tetrahydroanthraquinone is 1-n-butyl-1,2,3,4-tetrahydroanthraquinone.
Claim 7
Dependent Claim
79 words
In a cyclic process for the production of hydrogen peroxide by oxidation and reduction of alkylated anthraquinones, the improvement comprising employing as the working solution an anthraquinone-type solvent selected from the group consisting of p-xylene, methylnaphthalene, alkyl benzenes and mixtures thereof, in which is dissolved an alkyl-substituted-1,2,3,4-tetrahydroanthraquinone of the formula ##STR11## wherein R 1 is hydrogen or an alkyl group containing 1-10 carbon atoms and R 2 and R 3 are hydrogen or alkyl groups containing 1-6 carbon atoms.
Claim 8
Dependent Claim
79 words
In a cyclic process for the production of hydrogen peroxide by oxidation and reduction of alkylated anthraquinones, the improvement comprising employing as the working solution an anthraquinone-type solvent selected from the group consisting of p-xylene, methylnaphthalene, alkyl benzenes and mixtures thereof, in which is dissolved an alkyl-substituted-1,2,3,4-tetrahydroanthraquinone of the formula ##STR11## wherein R 1 is hydrogen or an alkyl group containing 1-10 carbon atoms and R 2 and R 3 are hydrogen or alkyl groups containing 1-6 carbon atoms.
Claim 9
Dependent Claim
11 words
The process of claim 6 in which the alkyl-substituted-1,2,3,4-tetrahydroanthraquinone is 1-n-butyl-1,2,3,4-tetrahydroanthraquinone.
Claim 10
Dependent Claim
60 words
In a cyclic process for the production of hydrogen peroxide by oxidation and reduction of alkylated anthraquinones dissolved in mixed solvents, the improvement comprising adding to the hydrogenator a compound of the formula ##STR12## wherein R 1 is an alkyl group containing 1-10 carbon atoms and R 2 and R 3 are hydrogen or alkyl groups containing 1-6 carbon atoms.
Claim 11
Dependent Claim
60 words
In a cyclic process for the production of hydrogen peroxide by oxidation and reduction of alkylated anthraquinones dissolved in mixed solvents, the improvement comprising adding to the hydrogenator a compound of the formula ##STR12## wherein R 1 is an alkyl group containing 1-10 carbon atoms and R 2 and R 3 are hydrogen or alkyl groups containing 1-6 carbon atoms.
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) | 1979-12-21 | 1980-06-21 | 1980-12-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-12-21 | 1984-06-21 | 1984-12-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-12-21 | 1988-06-21 | 1988-12-21 | $7700.00 | Window Closed / Lapsed |