US3923648A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Detoxification of aldehydes and ketones
Assignee: Union Carbide Corp
•
Filing: 1973-06-07
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Granted: 1975-12-02
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Expires: 1993-06-07
Abstract
Abstract Wastewaters containing alpha, beta-ethylenically unsaturated aldehydes and/or ketones may be rendered non-toxic to biological treatment systems by heating the wastewaters with a slight excess of alkali at elevated temperatures.
Inventors
- 👤 Jr Everett R Lashley
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 13:48
CPC Classifications
C; C02; C02F; C02F3/00; C02F3/02; C02F1/00; C02F1/02; C02F1/025; C02F2101/00; C02F2101/30; C02F2101/34; Y; Y02; Y02W; Y02W10/00; Y02W10/10
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
93 words
A METHOD OF DISPOSAL OF WASTEWATERS CONTAINING A,BETHYLENICALLY UNSATURATED ALDEHYDES SELECTED FROM THE CLASS CONSISITNG OF ACROLEIN, METHACRYLALDEHYDE, CROTONALDEHYDE, 2,4-HEXADIENAL, AND 2-ETHYLCROTONALDEHYDE OR METHYL VINYL KETONE COMPRISING CONTACTING SAID WASTEWATERS WITH SUFFICIENT BASE OT RENDER THE PH OF THE WASTEWATERS ALKALINE, MAINTAINING THE ALKALINE WASTEWATERS AT A PH OF AT LEAST 8 TEMPERATURE OF ABOUT 25* TO 100*C. FOR AT LEAST 15 MINUTES WHEREBY THE A,B-ETHYLENICALLY UNSATURATED ALDEHYDES OR METHYL VINYL KETONE ARE CONDENSED TO HIGHER MOLECULAR WEIGHT PRODUCTS, AND THEN BIOLOGICALLY DEGRADING THE WASTE WATER IN A BIOLOGICAL SYSTEM CONTAINING ACTIVE BIOMASS.
Claim 2
Independent Claim
93 words
A METHOD OF DISPOSAL OF WASTEWATERS CONTAINING A,BETHYLENICALLY UNSATURATED ALDEHYDES SELECTED FROM THE CLASS CONSISITNG OF ACROLEIN, METHACRYLALDEHYDE, CROTONALDEHYDE, 2,4-HEXADIENAL, AND 2-ETHYLCROTONALDEHYDE OR METHYL VINYL KETONE COMPRISING CONTACTING SAID WASTEWATERS WITH SUFFICIENT BASE OT RENDER THE PH OF THE WASTEWATERS ALKALINE, MAINTAINING THE ALKALINE WASTEWATERS AT A PH OF AT LEAST 8 TEMPERATURE OF ABOUT 25* TO 100*C. FOR AT LEAST 15 MINUTES WHEREBY THE A,B-ETHYLENICALLY UNSATURATED ALDEHYDES OR METHYL VINYL KETONE ARE CONDENSED TO HIGHER MOLECULAR WEIGHT PRODUCTS, AND THEN BIOLOGICALLY DEGRADING THE WASTE WATER IN A BIOLOGICAL SYSTEM CONTAINING ACTIVE BIOMASS.
Claim 3
Dependent Claim
15 words
Method claimed in claim 1 wherein the Alpha , Beta -ethylenically unsaturated aldehyde is acrolein.
Claim 4
Dependent Claim
15 words
Method claimed in claim 1 wherein the Alpha , Beta -ethylenically unsaturated aldehyde is methacrylaldehydE.
Claim 5
Dependent Claim
15 words
Method claimed in claim 1 wherein the Alpha , Beta -ethylenically unsaturated aldehyde is crotonaldehyde.
Claim 6
Dependent Claim
15 words
Method claimed in claim 1 wherein the Alpha , Beta -ethylenically unsaturated aldehyde is 2,4-hexadienal.
Claim 7
Dependent Claim
15 words
Method claimed in claim 1 wherein the Alpha , Beta -ethylenically unsaturated aldehyde is 2-ethylcrotonaldehyde.
Claim 8
Dependent Claim
12 words
Method claimed in claim 1 wherein the wastewaters contain methyl vinyl ketone.
Claim 9
Dependent Claim
14 words
Method claimed in claim 1 wherein the temperature is about 80* to about 100*C.
Claim 10
Dependent Claim
23 words
Method claimed in claim 1 wherein the time is about 15 to about 30 minutes and the temperature is about 80* to 95*C.
Claim 11
Dependent Claim
13 words
Method claimed in claim 1 wherein the base is an alkali metal hydroxide.
Claim 12
Dependent Claim
13 words
Method claimed in claim 10 wherein the alkali metal hydroxide is sodium hydroxide.
References Cited (Backward Citations)
US3676334A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-12-01 | 1979-06-02 | 1979-12-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-12-01 | 1983-06-02 | 1983-12-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-12-01 | 1987-06-02 | 1987-12-02 | $7700.00 | Window Closed / Lapsed |