Patent US4828718A successfully refreshed from Google Patents.
US4828718A
Expired / Lapsed
US
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Catalytic degradation of oxidizable organic and inorganic compounds in waters
Assignee: BASF SE
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Filing: 1988-02-03
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Granted: 1989-05-09
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Expires: 2008-02-03
Abstract
Abstract Oxidizable for organic and/or inorganic compounds in waters are subjected to catalytic degradation using a catalyst applied to an oxygen-storing inert carrier, for example of graphite, coke, a non-gassing coal or active carbon. The carrier used is coated with a cationic dye complexed with heteropolyacids and/or polyacids and/or salts or metal acids of subgroups V to VIII. The advantages of the process include the prevention of biological growth on the catalyst surface by the biocidal dye cation and the avoidance of calcium and magnesium deposits on the catalyst surface through the presence of the cationic solid.
Inventors
- 👤 Wolfgang Habermann
- 👤 Hubert Engelhardt
- 👤 Wolfgang Geiger
- 👤 Udo Mayer
- 👤 Peter Hammes
- 👤 Werner Simmler
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 23:37
CPC Classifications
C; C02; C02F; C02F1/00; C02F1/72; C02F1/725; B; B01; B01J; B01J31/00; B01J31/16; B01J31/1616; B01J31/18; B01J31/1805; B01J2531/00; B01J2531/50; B01J2531/56; B01J2531/60; B01J2531/64; B01J2531/66; B01J2531/70; B01J2531/80; B01J27/00; B01J27/14; B01J27/186; B01J27/188; Y; Y10; Y10S; Y10S210/00; Y10S210/902; Y10S210/908
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
63 words
A process for the catalytic degradation of oxidizable organic and/or inorganic compounds in waters with an oxidizing agent and a catalyst comprising a carrier, wherein the carrier used is an inert carrier which is coated with a cationic dye laked with heteropolyacids or polyacids or metal salts of subgroups V to VIII or metal acids of subgroups V to VIII, or mixtures thereof.
Claim 2
Dependent Claim
63 words
A process for the catalytic degradation of oxidizable organic and/or inorganic compounds in waters with an oxidizing agent and a catalyst comprising a carrier, wherein the carrier used is an inert carrier which is coated with a cationic dye laked with heteropolyacids or polyacids or metal salts of subgroups V to VIII or metal acids of subgroups V to VIII, or mixtures thereof.
Claim 3
Dependent Claim
16 words
A process as claimed in claim 1, wherein the inert carrier used is a carbon-containing carrier.
Claim 4
Dependent Claim
43 words
A process as claimed in claim 1, wherein the cationic dye used is a diarylmethane, triarylmethane, xanthene, acridine, phenazine, oxazine, thiazine, methine or azo dye having an external ammonium group or charge-carrying nitrogen atoms of the chromophore system, or a metal complex dye.
Claim 5
Dependent Claim
30 words
A process as claimed in claim 1, wherein a heteropolyacid which consists of metal acids of molybdenum and/or tungsten and/or vanadium and nonmetal acids of phosphorous and/or silicon is used.
Claim 6
Dependent Claim
18 words
A process as claimed in claim 1, wherein a polyacid of vanadium and/or molybdenum and/or tungsten is used.
Claim 7
Dependent Claim
34 words
A process as claimed in claim 2, wherein coating of the carbon-conaaining catalyst is effected by impregnation with a cationic dye dissolved in a solvent, followed by laking with the aqueous heteropolyacid or polyacid.
Claim 8
Dependent Claim
67 words
A process as claimed in claim 2, wherein the carbon-containing catalyst coated with the laked, cationic dye is introduced in the form of a powder into the water containing oxidizable compounds, the mass transfer conditions, the temperature and the feed of oxidizing agent being controlled so that the catalyst has a potential ε h +600 mV relative to the potential of the hydrogen electrode in the wastewater.
Claim 9
Dependent Claim
41 words
A process as claimed in claim 2, wherein the oxidizable organic and/or inorganic water ingredients are oxidized at from 0° to +400° C. in the presence of the carbon-containing catalyst coated with the laked, cationic dye and of the oxidizing agent.
Claim 10
Dependent Claim
41 words
A process as claimed in claim 2, wherein the carbon-containing catalyst coated with the laked, cationic dye is used in the form of granules in a static fixed-bed tube reactor through which the water containing oxidizable compounds and oxidizing agent flows.
Claim 11
Dependent Claim
34 words
A process as claimed in claim 2, wherein the carbon-containing catalyst coated with the laked, cationic dye is used in the form of granules having a particle size of from 2 to 6 mm.
References Cited (Backward Citations)
GB1185975A
Cited
US3823088A
Cited
US3988259A
Cited
US4048097A
Cited
US4049572A
Cited
DE3316265A1
Cited
EP0173880A1
Cited
US4696749A
Cited
US4751005A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1992-05-08 | 1992-11-07 | 1993-05-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1996-05-08 | 1996-11-07 | 1997-05-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2000-05-08 | 2000-11-07 | 2001-05-09 | $7700.00 | Window Closed / Lapsed |