US3259651A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Recovery of alkali metal salts of benzene-carboxylic acids
Assignee: BASF SE
•
Filing: 1965-01-07
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Granted: 1966-07-05
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Expires: 1985-01-07
Abstract
No abstract record available.
Inventors
- 👤 Schenk Walter
- 👤 Wallis Albrecht
- 👤 Vogel Ludwig
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 03:49
CPC Classifications
C; C07; C07C; C07C63/00; C07C63/14; C07C63/15; C07C63/16; C07C63/20; C07C51/00; C07C51/41; C07C51/416; C07C51/42
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
225 words
A PROCESS FOR THE RECOVERY OF ALKALI METAL SALTS OF BENZENE-CARBOXYLIC ACIDS OTHER THAN TEREPHTHALIC ACID WHCIH COMPRISES ADDING TO AN AQUEOUS SOLUTION OF ALKALI METAL SALTS OF BENZENECARBOXYLIC ACIDS OTHER THAN TEREPHTHALIC ACID, WHICH SOLUTION ALSO CONTAINS AT LEAST ONE ACID SUBSTANCE SELECTED FROM THE GROUP CONSISTING OF BENZOIC ACID AND ACID ALKALI METAL PHTHALATES AND HAS A PH BELOW THE EQUIVALENCE POINT OF SAID ALKALI METAL SALTS, SUCH AN AMOUNT OF ALKALI METAL HYDROXIDE THAT THE PH OF SAID SOLUTION IS 0.05 TO 0.9 UNIT ABOVE THE EQUIVALENCE POINT OF SAID ALKALI METAL SALTS, AND DIVIDING THE SOLUTION OBTAINED INTO TWO PORTIONS, ONE PORTION BEING EVAPORATED FOR RECOVERY OF DRY ALKALI METAL SALTS OF SAID BENZENECARBOXYLIC ACIDS AND THE OTHER PORTION BEING BROUGHT INTO INTIMATE CONTACT WITH A GAS SELECTED FROM THE GROUP CONSISTING OF CARBON DIOXIDE AND A GAS COMTAINING CARBON DIOXIDE AND THEN BEING RECYCLED TO SAID AQUEOUS SOLUTION OF SAID ALKALI METAL SALTS OF A BENZENECARBOXYLIC ACID OTHER THAN TEREPHTHALIC ACID AT A POINNT AHEAD OF THAT WHERE SAID ONE PORTION IS WITHDRAWN, SUCH AN AMOUNT OF ALKALI METAL HYDROGEN CARBONATE BEING PRODUCED IN SAID OTHER PORTION BY SAID CONTACT WITH SAID GAS THAT THE WHOLE EXCESS OF ALKALI METAL HYDROXIDE, WHICH BRINGS THE PH OF SAID SOLUTIONS OF SAID ALKALI METAL SALTS OF BENZENECARBOXYLIC ACIDS OTHER THAN TEREPHTHALIC ACID
Claim 2
Dependent Claim
225 words
A PROCESS FOR THE RECOVERY OF ALKALI METAL SALTS OF BENZENE-CARBOXYLIC ACIDS OTHER THAN TEREPHTHALIC ACID WHCIH COMPRISES ADDING TO AN AQUEOUS SOLUTION OF ALKALI METAL SALTS OF BENZENECARBOXYLIC ACIDS OTHER THAN TEREPHTHALIC ACID, WHICH SOLUTION ALSO CONTAINS AT LEAST ONE ACID SUBSTANCE SELECTED FROM THE GROUP CONSISTING OF BENZOIC ACID AND ACID ALKALI METAL PHTHALATES AND HAS A PH BELOW THE EQUIVALENCE POINT OF SAID ALKALI METAL SALTS, SUCH AN AMOUNT OF ALKALI METAL HYDROXIDE THAT THE PH OF SAID SOLUTION IS 0.05 TO 0.9 UNIT ABOVE THE EQUIVALENCE POINT OF SAID ALKALI METAL SALTS, AND DIVIDING THE SOLUTION OBTAINED INTO TWO PORTIONS, ONE PORTION BEING EVAPORATED FOR RECOVERY OF DRY ALKALI METAL SALTS OF SAID BENZENECARBOXYLIC ACIDS AND THE OTHER PORTION BEING BROUGHT INTO INTIMATE CONTACT WITH A GAS SELECTED FROM THE GROUP CONSISTING OF CARBON DIOXIDE AND A GAS COMTAINING CARBON DIOXIDE AND THEN BEING RECYCLED TO SAID AQUEOUS SOLUTION OF SAID ALKALI METAL SALTS OF A BENZENECARBOXYLIC ACID OTHER THAN TEREPHTHALIC ACID AT A POINNT AHEAD OF THAT WHERE SAID ONE PORTION IS WITHDRAWN, SUCH AN AMOUNT OF ALKALI METAL HYDROGEN CARBONATE BEING PRODUCED IN SAID OTHER PORTION BY SAID CONTACT WITH SAID GAS THAT THE WHOLE EXCESS OF ALKALI METAL HYDROXIDE, WHICH BRINGS THE PH OF SAID SOLUTIONS OF SAID ALKALI METAL SALTS OF BENZENECARBOXYLIC ACIDS OTHER THAN TEREPHTHALIC ACID
References Cited (Backward Citations)
US2863914A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1969-07-04 | 1970-01-03 | 1970-07-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1973-07-04 | 1974-01-03 | 1974-07-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1977-07-04 | 1978-01-03 | 1978-07-05 | $7700.00 | Window Closed / Lapsed |