US4289594A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Treatment of waste compositions
Assignee: International Business Machines Corp
•
Filing: 1980-05-09
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Granted: 1981-09-15
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Expires: 2000-05-09
Abstract
Abstract Process for treating liquid waste compositions which contain copper ions and a complexing agent for the copper which includes reducing the concentration of copper ions in the waste solution to less than about 8 ppm and contacting the solution with an ozone-containing gas and irradiating with ultraviolet light.
Inventors
- 👤 Warren A. Alpaugh
- 👤 George J. Macur
- 👤 James E. Sharkness
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 19:00
CPC Classifications
C; C23; C23C; C23C18/00; C23C18/16; C23C18/1601; C23C18/1617; C02; C02F; C02F9/00; C02F1/00; C02F1/30; C02F1/32; C02F1/70; C02F1/72; C02F1/78; C02F2101/00; C02F2101/10; C02F2101/20
Claims Analysis
Total Claims: 18
Claim 1
Independent Claim
66 words
A process for treating liquid waste composition containing copper ions and an organic complexing agent for the copper ions which comprises: reducing the concentration of copper ions in the waste composition to less than 8 ppm; then contacting the waste composition with an ozone-containing gas in an amount effective to react with and destroy said organic complexing agent; and irradiating said waste composition with ultraviolet light.
Claim 2
Dependent Claim
66 words
A process for treating liquid waste composition containing copper ions and an organic complexing agent for the copper ions which comprises: reducing the concentration of copper ions in the waste composition to less than 8 ppm; then contacting the waste composition with an ozone-containing gas in an amount effective to react with and destroy said organic complexing agent; and irradiating said waste composition with ultraviolet light.
Claim 3
Dependent Claim
21 words
The process of claim 1 wherein the copper ion concentration is reduced to less than about 5 ppm prior to irradiating.
Claim 4
Dependent Claim
21 words
The process of claim 1 wherein the copper ion concentration is reduced to less than about 1 ppm prior to irradiating.
Claim 5
Dependent Claim
30 words
The process of claim 1 or 2 or 3 wherein the concentration of iron ions in said waste composition is reduced to less than 5 ppm prior to the irradiating.
Claim 6
Dependent Claim
30 words
The process of claim 1 or 2 or 3 wherein the concentration of iron ions in said waste composition is reduced to less than 1 ppm prior to the irradiating.
Claim 7
Dependent Claim
27 words
The process of claim 1 wherein the copper ion concentration is reduced by adding copper particles, and a reducing agent to plate copper on the copper particles.
Claim 8
Dependent Claim
13 words
The process of claim 6 wherein the pH is adjusted to about 12.
Claim 9
Dependent Claim
11 words
The process of claim 6 wherein the reducing agent is formaldehyde.
Claim 10
Dependent Claim
20 words
The process of claim 6 wherein the reduction of the copper in concentration is carried out at about 70°-80° C.
Claim 11
Dependent Claim
17 words
The process of claim 1 wherein the concentration of complexing agent is reduced prior to the irradiation.
Claim 12
Dependent Claim
32 words
The process of claim 10 wherein the concentration of complexing agent is reduced by adjusting the pH of the composition to about 2.5 or less to cause precipitation of the complexing agent.
Claim 13
Dependent Claim
29 words
The process of claim 1 wherein said complexing agent is selected from the group of ethylenedinitrilotetraacetic acid, nitrilotriacetic acid, hydroxyl derivations thereof, alkali metal salts thereof, or mixtures thereof.
Claim 14
Dependent Claim
20 words
The process of claim 1 wherein said complexing agent is ethylenedinitrilotetraacetic acid or alkali metal salt thereof, or mixtures thereof.
Claim 15
Dependent Claim
20 words
The process of claim 1 wherein at least 1 g/l of copper ion is initially present in said waste composition.
Claim 16
Dependent Claim
24 words
The process of claim 1 or 12 or 13 wherein at least about 500 mg/l of complexing agent is present prior to the irradiation.
Claim 17
Dependent Claim
18 words
The process of claim 1 wherein the product obtained contains less than about 10 mg/l of complexing agent.
Claim 18
Dependent Claim
18 words
The process of claim 1 wherein the product obtained contains less than about 5 mg/l of complexing agent.
References Cited (Backward Citations)
US3844914A
Cited
US4144152A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1984-09-14 | 1985-03-16 | 1985-09-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1988-09-14 | 1989-03-16 | 1989-09-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1992-09-14 | 1993-03-16 | 1993-09-15 | $7700.00 | Window Closed / Lapsed |