US3963610A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of removing phenol from waste water
Assignee: Ineos Phenol GmbH
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Filing: 1973-10-01
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Granted: 1976-06-15
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Expires: 1993-10-01
Abstract
Abstract Phenol is removed from waste waters that occur in the manufacture of phenol by the cumene process wherein cumene is used as an extractant. The cumene which is used for extracting the phenol from the waste water and which is thereafter washed with sodium hydroxide to remove the phenol is treated prior to this washing with an aqueous solution of 1 to 20 wt-% preferably 5 to 10 wt-% sodium carbonate. If desired the aqueous solution can also contain sodium sulphate in amounts of 1 to 15% by weight. The sodium carbonate solution may also contain a non-ionogenic, surface-active substance such as aryl polyglycol ethers in amounts of from 0.001 to 1% by weight.
Inventors
- 👤 Bruno Hauschulz
- 👤 Heinrich VON Barneveld
- 👤 Wilfried Jordan
- 👤 Josef Mertmann
- 👤 Gerhard Rasner
- 👤 Harri Brenienek
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 12:49
CPC Classifications
C; C02; C02F; C02F1/00; C02F1/26
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
62 words
Method of dephenolizing waste waters occurring in the manufacture of phenol by the cumene process using cumene as extractant which comprises treating the cumene which is used for extracting the phenol from the waste water and which thereafter is washed with sodium hydroxide to remove the phenol, prior to this washing with an aqueous solution of 1 to 20 wt-% sodium carbonate.
Claim 2
Dependent Claim
62 words
Method of dephenolizing waste waters occurring in the manufacture of phenol by the cumene process using cumene as extractant which comprises treating the cumene which is used for extracting the phenol from the waste water and which thereafter is washed with sodium hydroxide to remove the phenol, prior to this washing with an aqueous solution of 1 to 20 wt-% sodium carbonate.
Claim 3
Dependent Claim
20 words
Method of claim 1 wherein said aqueous solution also contains sodium sulfate in amounts of 1 to 15% by weight.
Claim 4
Dependent Claim
23 words
Method of claim 1 wherein non-ionogenic, surface-active substances are added to the sodium carbonate solution, preferably in amounts of 0.001 to 1 wt-%.
Claim 5
Dependent Claim
30 words
Method of claim 3 wherein the non-ionogenic surface-active substances are added also to the waste water being dephenolized or to the cumene used for the extraction or to both phases.
Claim 6
Dependent Claim
14 words
Method of claim 3 wherein aryl polyglycol esters are used as non-ionogenic surface-active substances.
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) | 1979-06-15 | 1979-12-15 | 1980-06-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-06-15 | 1983-12-15 | 1984-06-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-06-15 | 1987-12-15 | 1988-06-15 | $7700.00 | Window Closed / Lapsed |