Patent US2078910A successfully refreshed from Google Patents.
US2877266A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Preparation of peracids
Assignee: Columbia Southern Chemical Corp
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Filing: 1957-06-04
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Granted: 1959-03-10
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Expires: 1977-06-04
Abstract
No abstract record available.
Inventors
- 👤 Korach Malcolm
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 21:14
CPC Classifications
C; C07; C07C; C07C409/00; C07C409/24; C07C409/26; C07C407/00; C07C407/003
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
191 words
A METHOD OF PREPARING PARACETIC ACID WHICH COMPRISES MIXING HYDROGEN PEROXIDE WITH ACETIC ACID IN LIQUID PHASE COMPRISING A WATER IMMISCIBLE INERT SOLVENT WHICH BOILS AT A TEMPERATURE BELOW ABOUT 100* C. AND FORMS AN AZEOTROPE WITH WATER THEREBY FORMING A MIXTURE COMPRISING THE SOLVENT, ACETIC ACID, PERACETIC ACID, HYDROGEN PEROXIDE, AND WATER, DISTILLING FROM THE MIXTURE AN AZEOTROPE OF SOLVENT AND WATER THEREBY CAUSING FORMATION OF FURTHER PERACETIC ACID, REFLUXING A PORTION OF THE VAPOR THUS FORMED TO CONDENSE HYDROGEN PEROXIDE AND ACETIC ACID VAPOR FROM THE MIXTURE AND SEPARATELY REMOVING AND CONDENSING ANOTHER PORTION OF SAID VAPOR WHICH CONTAINS WATER, PERMITTING THE WATER AND SOLVENT IN THE RESULTING CONDENSATE OF SAID OTHER PORTION TO SEPARATE, RETURNING THE SOLVENT RECOVERED FROM THE CONDENSATE TO THE MIXTURE BEING HEATED, AND CONTINUING SAID DISTILLATION UNTIL THE MAJOR PORTION OF WATER IS DRIVEN OFF, WHILE MAINTAINING THE CONCENTRATION OF SOLVENT IN CONTACT WITH THE PERACETIC ACID THUS FROMED HIGH ENOUGH TO MAINTAIN IN THE MIXTURE AT LEAST 25 PERCENT BY WEIGHT OF SAID SOLVENT, BASED UPON THE WEIGHT OF HYDROGEN PEROXIDE, PERACETIC ACID, AND SOLVENT THEREIN, THROUGHOUT THE PERIOD OF REACTION AND DISTILLATION.
Claim 2
Independent Claim
191 words
A METHOD OF PREPARING PARACETIC ACID WHICH COMPRISES MIXING HYDROGEN PEROXIDE WITH ACETIC ACID IN LIQUID PHASE COMPRISING A WATER IMMISCIBLE INERT SOLVENT WHICH BOILS AT A TEMPERATURE BELOW ABOUT 100* C. AND FORMS AN AZEOTROPE WITH WATER THEREBY FORMING A MIXTURE COMPRISING THE SOLVENT, ACETIC ACID, PERACETIC ACID, HYDROGEN PEROXIDE, AND WATER, DISTILLING FROM THE MIXTURE AN AZEOTROPE OF SOLVENT AND WATER THEREBY CAUSING FORMATION OF FURTHER PERACETIC ACID, REFLUXING A PORTION OF THE VAPOR THUS FORMED TO CONDENSE HYDROGEN PEROXIDE AND ACETIC ACID VAPOR FROM THE MIXTURE AND SEPARATELY REMOVING AND CONDENSING ANOTHER PORTION OF SAID VAPOR WHICH CONTAINS WATER, PERMITTING THE WATER AND SOLVENT IN THE RESULTING CONDENSATE OF SAID OTHER PORTION TO SEPARATE, RETURNING THE SOLVENT RECOVERED FROM THE CONDENSATE TO THE MIXTURE BEING HEATED, AND CONTINUING SAID DISTILLATION UNTIL THE MAJOR PORTION OF WATER IS DRIVEN OFF, WHILE MAINTAINING THE CONCENTRATION OF SOLVENT IN CONTACT WITH THE PERACETIC ACID THUS FROMED HIGH ENOUGH TO MAINTAIN IN THE MIXTURE AT LEAST 25 PERCENT BY WEIGHT OF SAID SOLVENT, BASED UPON THE WEIGHT OF HYDROGEN PEROXIDE, PERACETIC ACID, AND SOLVENT THEREIN, THROUGHOUT THE PERIOD OF REACTION AND DISTILLATION.
References Cited (Backward Citations)
US2814641A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1962-03-09 | 1962-09-08 | 1963-03-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1966-03-09 | 1966-09-08 | 1967-03-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1970-03-09 | 1970-09-08 | 1971-03-10 | $7700.00 | Window Closed / Lapsed |