US4370241A
Expired / Lapsed
US
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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: 1979-11-27
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Granted: 1983-01-25
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Expires: 1999-11-27
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
2026-11-09 03:42
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: 26
Claim 1
Independent Claim
127 words
A process of purifying waste water containing (1) phenol in the absence of formaldehyde, (2) a substituted phenol or (3) phenol+formaldehyde comprising treating the waste water with hydrogen peroxide in the presence of either (a) metallic iron under acid conditions and an activator which is a salt of an alkali metal, a salt of an alkaline earth metal, a zinc salt, an aluminum salt, a nickel salt or a manganese salt or is insoluble silica or (b) metallic copper and an activator which is a salt of an alkali metal, a salt of an alkaline earth metal, a zinc salt, an aluminum salt, or a manganese salt or is insoluble silica, said activator being present in an amount of 0.1 to 0.2% based on the hydrogen peroxide.
Claim 2
Dependent Claim
127 words
A process of purifying waste water containing (1) phenol in the absence of formaldehyde, (2) a substituted phenol or (3) phenol+formaldehyde comprising treating the waste water with hydrogen peroxide in the presence of either (a) metallic iron under acid conditions and an activator which is a salt of an alkali metal, a salt of an alkaline earth metal, a zinc salt, an aluminum salt, a nickel salt or a manganese salt or is insoluble silica or (b) metallic copper and an activator which is a salt of an alkali metal, a salt of an alkaline earth metal, a zinc salt, an aluminum salt, or a manganese salt or is insoluble silica, said activator being present in an amount of 0.1 to 0.2% based on the hydrogen peroxide.
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
20 words
A process according to claim 1 wherein the metal is present in the form of a sheet, wire or granulate.
Claim 8
Dependent Claim
17 words
A process according to claim 1 wherein the purification is carried out in a ferrous metal containers.
Claim 9
Dependent Claim
19 words
A process according to claim 1 wherein the purification is carried out with stirring using a ferrous metal stirrer.
Claim 10
Dependent Claim
51 words
A process according to claim 1 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 also present in the waste water there are employed an additional 2 moles of hydrogen peroxide per mole of formaldehyde.
Claim 11
Dependent Claim
30 words
The process of claim 9 wherein the metal is iron and per cubic meter of waste water there is an iron surface area of about 1 to 20 square meters.
Claim 12
Dependent Claim
13 words
The process of claim 10 wherein the activator is sodium chloride or silica.
Claim 13
Dependent Claim
11 words
A process according to claim 11 wherein the activator is silica.
Claim 14
Dependent Claim
11 words
The process of claim 11 wherein the activator is sodium chloride.
Claim 15
Dependent Claim
38 words
A process according to claim 13 wherein the waste water contains phenol in an amount of about 0.01 to 0.5% and the iron surface area is about 7.5 to 16 square meters per cubic meter of waste water.
Claim 16
Dependent Claim
38 words
A process according to claim 14 wherein the waste water contains phenol in an amount of about 0.1 to 0.5% and the iron surface area is about 11 to 16 square meters per cubic meter of waste water.
Claim 17
Dependent Claim
45 words
The process of claim 13 wherein the waste water contains phenol in an amount of 0.01 to 0.5% and formaldehyde in an amount of 0.01 to 0.5% and the iron surface area is about 7.5 to 18 square meters per cubic meter of waste water.
Claim 18
Dependent Claim
14 words
A process according to claim 1 wherein the activator is sodium chloride or silica.
Claim 19
Dependent Claim
12 words
A process according to claim 17 wherein the activator is sodium chloride.
Claim 20
Dependent Claim
24 words
A process according to claim 1 wherein the activator is a salt of an alkali metal or a salt of an alkaline earth metal.
Claim 21
Dependent Claim
27 words
A process according to claim 1 wherein per cubic meter of waste water there is an iron or copper surface area of 1 to 20 square meters.
Claim 22
Dependent Claim
19 words
A process according to claim 1 wherein the metal is iron in the form of V 2 A steel.
Claim 23
Dependent Claim
17 words
A process according to claim 1 wherein after the purificatiion the acid reacting waste water is neutralized.
Claim 24
Dependent Claim
12 words
A process according to claim 1 wherein there is present metallic iron.
Claim 25
Dependent Claim
17 words
A process according to claim 1 wherein the activator is a salt of an alkaline earth metal.
Claim 26
Dependent Claim
11 words
A process according to claim 1 wherein the activator is silica.
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) | 1986-01-24 | 1986-07-26 | 1987-01-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1990-01-24 | 1990-07-26 | 1991-01-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1994-01-24 | 1994-07-26 | 1995-01-25 | $7700.00 | Window Closed / Lapsed |