US3929636A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for conditioning effluent contaminated by aldehyde compounds
Assignee: Air Liquide SA
•
Filing: 1973-12-26
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Granted: 1975-12-30
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Expires: 1993-12-26
Abstract
Abstract A process for the treatment of industrial effluent containing toxic impurities wherein aldehydes are oxidized by a peroxy compound containing for example, the anion SO5 in the form of Caro''s acid or in the form of a salt thereof.
Inventors
- 👤 Jean-Pierre Zumbrunn
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 07:20
CPC Classifications
C; C02; C02F; C02F1/00; C02F1/72; C02F1/722
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
77 words
A PROCESS FOR TREATING INDUSTRIAL EFFLUENT CONTAINING ALDEHYDE IMPURITIES, COMPRISING: ADJUSTING THE PH OF SAID EFFLUENT TO A VALUE OF AT LEAST ABOUT 9; REACTING THE ALDEHYDE IMPURITIES IN SAID EFFLUENT WITH AN OXIDIZING REAGENT COMPRISING THE PEROXYMONOSULFURIC ANION, SO5-, BY MIXING SAID EFFLUENT WITH A COMPOUND OR COMPOUNDS WHICH FORM THE PEROXYMONOSULFURIC ANION, SO5-, IN SAID EFFLUENT, SAID OXIDIZING REAGENT BEING PRESENT IN THE EFFLUENT IN A MOLAR RATIO OF OXIDANT/ALDEHYDE AT LEAST EQUAL TO 1.
Claim 2
Dependent Claim
77 words
A PROCESS FOR TREATING INDUSTRIAL EFFLUENT CONTAINING ALDEHYDE IMPURITIES, COMPRISING: ADJUSTING THE PH OF SAID EFFLUENT TO A VALUE OF AT LEAST ABOUT 9; REACTING THE ALDEHYDE IMPURITIES IN SAID EFFLUENT WITH AN OXIDIZING REAGENT COMPRISING THE PEROXYMONOSULFURIC ANION, SO5-, BY MIXING SAID EFFLUENT WITH A COMPOUND OR COMPOUNDS WHICH FORM THE PEROXYMONOSULFURIC ANION, SO5-, IN SAID EFFLUENT, SAID OXIDIZING REAGENT BEING PRESENT IN THE EFFLUENT IN A MOLAR RATIO OF OXIDANT/ALDEHYDE AT LEAST EQUAL TO 1.
Claim 3
Dependent Claim
17 words
A process in accordance with claim 1, wherein said compound is monopersulfuric acid or a salt thereof.
Claim 4
Dependent Claim
17 words
A process in accordance with claim 1, wherein said compound is dipersulphuric acid or a salt thereof.
Claim 5
Dependent Claim
32 words
A process in accordance with claim 1, wherein said reacting step comprises treating said effluent with an association of compounds which form the peroxymonosulphuric anion, SO5 , in situ by chemical reaction.
Claim 6
Dependent Claim
21 words
A process in accordance with claim 4 wherein said association of compounds is a mixture of hydrogen peroxide and sulphuric acid.
Claim 7
Dependent Claim
21 words
A process according to claim 1, wherein the pH of the effluent is at a pH between about 9 and 10.
Claim 8
Dependent Claim
14 words
A process according to clAim 1, wherein the effluent treatment proceeds at ambient temperature.
Claim 9
Dependent Claim
26 words
A process according to claim 1, wherein the oxidant is introduced to the effluent in a quantity such that the oxidant/aldehyde molar ratio is about 1.1.
Claim 10
Dependent Claim
16 words
A process according to claim 1, wherein completion of the reaction is determined electrochemically or analytically.
Claim 11
Dependent Claim
28 words
A process according to claim 9, wherein completion of the reaction is indicated by the potential of a pair of redox electrodes stabilized at a steady positive value.
References Cited (Backward Citations)
US2311314A
Cited
US3394080A
Cited
US3510424A
Cited
US3715309A
Cited
US3829379A
Cited
US3711402A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-12-29 | 1979-06-30 | 1979-12-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-12-29 | 1983-06-30 | 1983-12-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-12-29 | 1987-06-30 | 1987-12-30 | $7700.00 | Window Closed / Lapsed |