US3305314A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Purification process
Assignee: PPG Industries Inc
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Filing: 1958-07-07
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Granted: 1967-02-21
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Expires: 1978-07-07
Abstract
No abstract record available.
Inventors
- 👤 Max O Freeland
- 👤 Peter R Johnston
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 16:35
CPC Classifications
C; C01; C01B; C01B15/00; C01B15/01; C01B15/013; C01B15/0135
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
193 words
A METHOD OF REMOVING CARBONACEOUS IMPURITY FROM AQUEOUS HYDROGEN PEROXIDE SOLUTION CONTAINING SUCH IMPURITY, SAID SOLUTION HAVING BEEN PRODUCED BY CONTINUOUSLY REDUCING AN ANTHRAQUINONE, OXIDIZING SAID REDUCED ANTHRAQUINONE TO FORM AN ANTHRAQUINONE AND HYDROGEN PEROXIDE, CONTACTING THE PRODUCT OF SAID OXIDATION WITH WATER TO EXTRACT HYDROBEN PEROXIDE THEREBY FORMING SAID AQUEOUS HYDROGEN PEROXIDE SOLUTION AND RECYCLING ANTHRAQUINONE FORMED ON SAID OXIDATION TO EFFECT SAID REDUCTION, WHICH COMPRISES PASSING SAID AQUEOUS HYDROGEN PEROXIDE SOLUTION TO A SHORT CYCLE BY CONTACTING SAID SOLUTION WITH AN ANION EXCHANGE RESIN IN THE FORM OF A SALT OF AN ACID WEAKER THAN ACETIC ACID, REGENERATING THE SPENT RESIN THUS PRODUCED BY CONTACTING THE RESIN WITH AN AQUEOUS SOLUTION OF AN ALKALI METAL SALT OF AN ACID WEAKER THAN ACETIC ACID, CONTACTING THE REGENERATED RESIN WITH FURTHER OF SAID HYDROGEN PEROXIDE SOLUTION, REPEATING SAID SHORT CYCLE A PLURALITY OF TIMES, AND PERIODICALLY EFFECTING A LONG CYCLE BY CONTACTING THE RESIN WITH AN ACID WHICH IS AT LEAST AS STRONG AS ACETIC ACID, AND THEREAFTER REGENERATING THE RESIN AFTER SAID LONG CYCLE BY CONTACTING SUCH RESIN WITH AN AQUEOUS SOLUTION OF SAID ALKALI METAL SALT AND REPEATING SAID SHORT CYCLE.
Claim 2
Independent Claim
193 words
A METHOD OF REMOVING CARBONACEOUS IMPURITY FROM AQUEOUS HYDROGEN PEROXIDE SOLUTION CONTAINING SUCH IMPURITY, SAID SOLUTION HAVING BEEN PRODUCED BY CONTINUOUSLY REDUCING AN ANTHRAQUINONE, OXIDIZING SAID REDUCED ANTHRAQUINONE TO FORM AN ANTHRAQUINONE AND HYDROGEN PEROXIDE, CONTACTING THE PRODUCT OF SAID OXIDATION WITH WATER TO EXTRACT HYDROBEN PEROXIDE THEREBY FORMING SAID AQUEOUS HYDROGEN PEROXIDE SOLUTION AND RECYCLING ANTHRAQUINONE FORMED ON SAID OXIDATION TO EFFECT SAID REDUCTION, WHICH COMPRISES PASSING SAID AQUEOUS HYDROGEN PEROXIDE SOLUTION TO A SHORT CYCLE BY CONTACTING SAID SOLUTION WITH AN ANION EXCHANGE RESIN IN THE FORM OF A SALT OF AN ACID WEAKER THAN ACETIC ACID, REGENERATING THE SPENT RESIN THUS PRODUCED BY CONTACTING THE RESIN WITH AN AQUEOUS SOLUTION OF AN ALKALI METAL SALT OF AN ACID WEAKER THAN ACETIC ACID, CONTACTING THE REGENERATED RESIN WITH FURTHER OF SAID HYDROGEN PEROXIDE SOLUTION, REPEATING SAID SHORT CYCLE A PLURALITY OF TIMES, AND PERIODICALLY EFFECTING A LONG CYCLE BY CONTACTING THE RESIN WITH AN ACID WHICH IS AT LEAST AS STRONG AS ACETIC ACID, AND THEREAFTER REGENERATING THE RESIN AFTER SAID LONG CYCLE BY CONTACTING SUCH RESIN WITH AN AQUEOUS SOLUTION OF SAID ALKALI METAL SALT AND REPEATING SAID SHORT CYCLE.
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) | 1970-02-20 | 1970-08-22 | 1971-02-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1974-02-20 | 1974-08-22 | 1975-02-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1978-02-20 | 1978-08-22 | 1979-02-21 | $7700.00 | Window Closed / Lapsed |