US3887490A
Expired / Lapsed
US
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Process for regenerating noble metal catalyst for the synthesis of hydrogen peroxide according to the anthraquinone process
Assignee: Evonik Operations GmbH
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Filing: 1973-08-20
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Granted: 1975-06-03
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Expires: 1993-08-20
Abstract
Abstract In situ regeneration of noble metal catalysts for the synthesis of hydrogen peroxide by the anthraquinone process is provided by employing as the working solution coming from the extraction or desorption step and being introduced into the hydrogenation step a solution which contains at least 250 mg/liter of hydrogen peroxide, to thereby completely regenerate the noble metal catalyst by full capacity of the hydrogenation step.
Inventors
- 👤 Gerd Schreyer
- 👤 Ferdinand Theissen
- 👤 Otto Weiberg
- 👤 Wolfgang Weigert
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 15:19
CPC Classifications
B; B01; B01J; B01J23/00; B01J23/90; B01J23/96; C; C01; C01B; C01B15/00; C01B15/01; C01B15/022; C01B15/023; Y; Y02; Y02P; Y02P20/00; Y02P20/50; Y02P20/584
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
78 words
A process for the in situ regeneration of noble metal catalyst of the platinum group of the periodic system for the synthesis of hydrogen peroxide by the anthraquinone process, said catalyst being deposited on a catalyst consisting of silica, said process comprising introducing into the hydrogenation step of the anthraquinone process an anthraquinone working solution still containing 300 mg/liter up to 1,000 mg/liter of hydrogen peroxide to thereby completely regenerate the noble metal catalyst to full hydrogeNation capacity.
Claim 2
Dependent Claim
78 words
A process for the in situ regeneration of noble metal catalyst of the platinum group of the periodic system for the synthesis of hydrogen peroxide by the anthraquinone process, said catalyst being deposited on a catalyst consisting of silica, said process comprising introducing into the hydrogenation step of the anthraquinone process an anthraquinone working solution still containing 300 mg/liter up to 1,000 mg/liter of hydrogen peroxide to thereby completely regenerate the noble metal catalyst to full hydrogeNation capacity.
Claim 3
Dependent Claim
76 words
A PROCESS FOR THE IN SITU REGENERATION OF NOBLE METAL CATALYST OF THE PLATINUM GROUP OF THE PERIODC SYSTEM FOR THE SYNTHESIS OFHYDROGEN PEROXIDE BY THE ANTHRAQUINONE PROCESS, SAID CATALYST BEING DEPOSITED ON A CATALYST CONSISTING OF SILICA, SAID PROCESS COMPRISING INTRODUCING INTO THEHYDROGENATION STEP OF THE ANTHRAQUINONE PROCESS AN ANTHRAQUINONE WORKING SOLUTION STILL CONTAINING 300 MG/LITER UP TO 1,00 MG/LITER OF HYDROGEN PEROXIDE TO THEREBY COMPLETELY REGENERATE THE NOBLE METAL CATALYST TO FULL HYDROGENATION CAPACITY.
Claim 4
Dependent Claim
76 words
A PROCESS FOR THE IN SITU REGENERATION OF NOBLE METAL CATALYST OF THE PLATINUM GROUP OF THE PERIODC SYSTEM FOR THE SYNTHESIS OFHYDROGEN PEROXIDE BY THE ANTHRAQUINONE PROCESS, SAID CATALYST BEING DEPOSITED ON A CATALYST CONSISTING OF SILICA, SAID PROCESS COMPRISING INTRODUCING INTO THEHYDROGENATION STEP OF THE ANTHRAQUINONE PROCESS AN ANTHRAQUINONE WORKING SOLUTION STILL CONTAINING 300 MG/LITER UP TO 1,00 MG/LITER OF HYDROGEN PEROXIDE TO THEREBY COMPLETELY REGENERATE THE NOBLE METAL CATALYST TO FULL HYDROGENATION CAPACITY.
Claim 5
Dependent Claim
11 words
A process according to claim 1 wherein the catalyst includes palladium.
Claim 6
Dependent Claim
34 words
A process according to claim 1 wherein the working solution is extracted or desorbed to reduce the H2O2 content to 300 mg/liter up to 1,000 mg/liter prior to its introduction into the hydrogenation step.
Claim 7
Dependent Claim
14 words
A process according to claim 3 wherein the process is carried out at 60*C.
Claim 8
Dependent Claim
14 words
A process according to claim 1 wherein the process is carried out at 60*C.
Claim 9
Dependent Claim
67 words
A process according to claim 1 wherein the working solution introduced into the hydrogenation step to regenerate the catalyst directly in the hydrogenation step and the hydrogenated working solution is returned to the oxidation step to form further hydrogen peroxide, the thus formed oxidized working solution is extracted or desorbed to reduce the H2O2 content to 300-1,000 mg/liter and is then again reintroduced into the hydrogenation step.
Claim 10
Dependent Claim
68 words
A PROCESS ACCORDING TO CLAIM 1 WHEREIN THE WORKING SOLUTION INTRODUCED INTO THE HYDROGENATION STEP TO REGENERATE THE CATALYST DIRECTLY IN THE HYDROGENATION STEP TO AND THE HYDROGENATED WORKING SOLUTION IS RETURNED TO THE OXIDATION STEP TO FOM FURTHER HYDROGEN PEROXIDE, THE THUS FORMED OXIDIZED WORKING SOLUTION IS EXTRACTED OR DESORBED TO REDUCE THE H2O2 CONTENT TO 300-1,000 MG/LITER AND IS THEN AGAIN REINTRODUCED INTO THE HYDROGENATION STEP.
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) | 1978-06-02 | 1978-12-02 | 1979-06-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-06-02 | 1982-12-02 | 1983-06-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-06-02 | 1986-12-02 | 1987-06-03 | $7700.00 | Window Closed / Lapsed |