Separation and recovery of catalyst residue
Abstract
Abstract THE INVENTION RELATES TO SEPARATION AND RECOVERY OF COPPER-AMINE COMPLEX CATALYST RESIDUES FROM A REACTION STREAM IN A PROCESS FOR THE FORMATION OF POLYPHENYLENE ETHERS BY AN OXIDATIVE COUPLINE POLYMERIZATION REACTION. THE PROCESS COMPRISES WIMULTANEOUSLY TERMINATING THE REACTION AND EXTRACTING CATALYST RESIDUE BY CONTACT OF THE REACTION SOLUTION WITH AN AQUEOUS ACID SOLUTION IN A COUNTERCURRENT, LIQUID-LIQUID EXTRACTION COLUMN. THE POLYMER IS THEN RECOVERED FROM THE REACTION SOLUTION SUBSTANTIALLY FREE OF CATALYST RESIDUE. THE AMINE IS RECOVERED FROM THE AQUEOUS ACID SOLUTION BY PH ADJUSTMENT WITH ALKALI AND MAY BE RE-USED IF DESIRED. THE PROCESS OF THE INVENTION IS LESS EXPENSIVE THAN PRIOR ART PROCEDURES AND PROVIDES MORE EFFECTIVE CATALYST REMOVAL THAN OTHER COMMERCIALLY ACCEPTABLE METHIDS.
Inventors
- 👤 M Modan
Bibliographic Details
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-05-14 | 1976-11-13 | 1977-05-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-05-14 | 1980-11-13 | 1981-05-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-05-14 | 1984-11-13 | 1985-05-15 | $7700.00 | Window Closed / Lapsed |