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US4340490A
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Process for the detoxification of waste water containing phenol, phenol derivative or phenol and formaldehyde
Assignee: Evonik Operations GmbH
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Filing: 1977-12-20
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Granted: 1982-07-20
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Expires: 1997-12-20
Abstract
Abstract Waste water containing phenol, phenol derivatives or phenol plus formaldehyde is purified by treating the waste water with hydrogen peroxide and either iron, copper or the complex salt sodium iron (III) ethylenediamine tetraacetate.
Inventors
- 👤 Helmut Junkermann
- 👤 Horst Kruger
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 15:04
CPC Classifications
C; C02; C02F; C02F1/00; C02F1/72; C02F1/722; C02F1/68; C02F1/683; C02F1/725; Y; Y10; Y10S; Y10S210/00; Y10S210/902; Y10S210/908; Y10S210/909
Claims Analysis
Total Claims: 14
Claim 1
Independent Claim
67 words
A process for purifying waste water containing (I) phenol, (2) a substitute phenol or (3) phenol+formaldehyde comprising treating the waste water with hydrogen peroxide in the presence of 0.5 to 2 grams per liter of waste water of the complex sodium iron (III) ethylenediamine tetraacetate trihydrate or the equivalent amount of the complex sodium iron (II) ethylenediamine tetraacetate, the treatment being at least initiated under alkaline conditions.
Claim 2
Dependent Claim
67 words
A process for purifying waste water containing (I) phenol, (2) a substitute phenol or (3) phenol+formaldehyde comprising treating the waste water with hydrogen peroxide in the presence of 0.5 to 2 grams per liter of waste water of the complex sodium iron (III) ethylenediamine tetraacetate trihydrate or the equivalent amount of the complex sodium iron (II) ethylenediamine tetraacetate, the treatment being at least initiated under alkaline conditions.
Claim 3
Dependent Claim
23 words
A process according to claim 1 wherein the waste water contains phenol, an alkyl phenol, a polyhydric phenol, a halogenated phenol or phenol+formaldehyde.
Claim 4
Dependent Claim
20 words
A process according to claim 2 wherein the waste water contains phenol, cresol, chlorophenol, resorcinol, pyrocatechol, pyrogallol, hydroquinone or phenol+formaldehyde.
Claim 5
Dependent Claim
12 words
A process according to claim 1 wherein the waste water contains phenol.
Claim 6
Dependent Claim
12 words
A process according to claim 1 wherein the waste water contains phenol+formaldehyde.
Claim 7
Dependent Claim
14 words
A process according to claim 1 wherein the waste water contains phenol or phenol+formaldehyde.
Claim 8
Dependent Claim
35 words
A process according to claim 1 wherein there is present 1 to 2 grams of the complex sodium iron (III) ethylenediamine tetraaacetate trihydrate or the equivalent amount of the complex sodium iron (III) ethylenediamine tetraacetate.
Claim 9
Dependent Claim
25 words
A process according to claim 1 wherein the treatment of the waste water with the complex is initiated at a pH of at least 8.
Claim 10
Dependent Claim
16 words
A process according to claim 8 wherein the treatment is initiated at a pH of 8-12.
Claim 11
Dependent Claim
50 words
A process according to claim 9 wherein there are employed 7.5 to 8 moles of hydrogen peroxide per mole of phenol or substituted phenol with the proviso that when formaldehyde is present in the waste water there are employed an additional 2 moles of hydrogen peroxide per mole of formaldehyde.
Claim 12
Dependent Claim
16 words
A process according to claim 10 wherein after purification the acid reacting waste water is neutralized.
Claim 13
Dependent Claim
14 words
A process according to claim 10 wherein the waste water contains phenol or phenol+formaldehyde.
Claim 14
Dependent Claim
16 words
A process according to claim 1 wherein after purification the acid reacting waste water is neutralized.
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) | 1985-07-19 | 1986-01-18 | 1986-07-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1989-07-19 | 1990-01-18 | 1990-07-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1993-07-19 | 1994-01-18 | 1994-07-20 | $7700.00 | Window Closed / Lapsed |