Patent US3923967A successfully refreshed from Google Patents.
US3923967A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Production of hydrogen peroxide using the anthraquinone process
Assignee: EIDP Inc
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Filing: 1973-01-12
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Granted: 1975-12-02
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Expires: 1993-01-12
Abstract
Abstract An improvement in the cyclic process for producing hydrogen peroxide from anthraquinones is obtained by employing as a working intermediate a 5,6,7,8-tetrahydro-1-alkyl-9,10anthraquinone of the formula WHEREIN EACH OF R1, R2, R3 and R4 is either hydrogen or a 1 to 8 carbon straight chain alkyl hydrocarbon group. The working intermediate is employed in a water immiscible solvent. The disclosed 5,6,7,8-tetrahydro-1-alkyl-9,10-anthraquinones exhibit excellent solubilities in both the anthraquinone and anthrahydroquinone forms, thereby allowing high hydrogen peroxide productivities per cycle and relatively concentrated extract hydrogen peroxide solutions.
Inventors
- 👤 Jack R Kirchner
- 👤 Lawrence G Vaughan
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 19:29
CPC Classifications
C; C01; C01B; C01B15/00; C01B15/01; C01B15/022; C01B15/023; C07; C07C; C07C2603/00; C07C2603/02; C07C2603/04; C07C2603/22; C07C2603/24
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
90 words
IN A CYCLIC PROCESS FOR PRODUCING HYDROGEN PEROXIDE IN WHICH A WORKING SOLUTION OF AN ANTHRAQUINONE WORKING INTERMEDIATE IN A WATER-IMMISCIBLE SOLVENT IS HYDROGENATED IN A REDUCTION STAGE AND THE RESULTING SOLUTION OF THE ANTHRAHYDROQUINONE FORM OF SAID INTERMEDIATE IS OXIDIZE IN AN OXIDATION STAGE TO REGENERATE SAID SOLUTION OF THE ANTHRAQUINONE WORKING INTERMEIDATE FOR RECYCLING TO SAID REDUCTION STAGE AFTER THE HYDROGEN PEROXIDE SIMULTANEOUSLY FORMED IN SAID OXIDATION STAGE IS REMOVED FROM SAID WORKING SOLUTION, THE IMPROVEMENT COMPRISING EMPLOYING AS SAID ANTHRAQUINONE WORKING INTERMEDIATE A 5,6,7,8-TETRAHYDRO-1-ALKYL-9,10ANTHRAQUINONE OF THE FORMULA
Claim 2
Dependent Claim
90 words
IN A CYCLIC PROCESS FOR PRODUCING HYDROGEN PEROXIDE IN WHICH A WORKING SOLUTION OF AN ANTHRAQUINONE WORKING INTERMEDIATE IN A WATER-IMMISCIBLE SOLVENT IS HYDROGENATED IN A REDUCTION STAGE AND THE RESULTING SOLUTION OF THE ANTHRAHYDROQUINONE FORM OF SAID INTERMEDIATE IS OXIDIZE IN AN OXIDATION STAGE TO REGENERATE SAID SOLUTION OF THE ANTHRAQUINONE WORKING INTERMEIDATE FOR RECYCLING TO SAID REDUCTION STAGE AFTER THE HYDROGEN PEROXIDE SIMULTANEOUSLY FORMED IN SAID OXIDATION STAGE IS REMOVED FROM SAID WORKING SOLUTION, THE IMPROVEMENT COMPRISING EMPLOYING AS SAID ANTHRAQUINONE WORKING INTERMEDIATE A 5,6,7,8-TETRAHYDRO-1-ALKYL-9,10ANTHRAQUINONE OF THE FORMULA
Claim 3
Dependent Claim
13 words
The process of claim 1 in which the anthraquinone working intermediate is 5,6,7,8-tetrahydro-1-n-butyl-9,10-anthraquinone.
Claim 4
Dependent Claim
13 words
The process of claim 1 in which the anthraquinone working intermediate is 5,6,7,8-tetrahydro-1-isopentyl-3-methyl-9,10-anthraquinone.
Claim 5
Dependent Claim
14 words
The process of claim 1 in which the anthraquinone working intermediate is 5,6,7,8-tetrahydro-1-(3-methylpentyl)-3-ethyl-9, 10-anthraquinone.
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) | 1978-12-01 | 1979-06-02 | 1979-12-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-12-01 | 1983-06-02 | 1983-12-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-12-01 | 1987-06-02 | 1987-12-02 | $7700.00 | Window Closed / Lapsed |