US3900555A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for generating an oxidizing reagent for the treatment of polluted water
Assignee: Air Liquide SA
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Filing: 1973-07-19
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Granted: 1975-08-19
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Expires: 1993-07-19
Abstract
Abstract A process for obtaining monopersulphuric acid from hydrogen peroxide and sulphuric acid is disclosed. Hydrogen peroxide in the form of an aqueous solution with a concentration ranging from 35 to 100% and either concentrated sulphuric acid or fuming sulphuric acid are added simultaneously to a reaction vessel. The temperature of the reaction is maintained in the range -10*C to +80*C and the supply of the hydrogen peroxide and sulphuric acid to the reaction vessel is controlled so that the generation of the monoperoxysulphuric acid occurs when required and the quantity thereof produced is adjusted according to the quantity thereof required for reaction with another reactant, for example a pollutant, the concentration of the monoperoxysulphuric acid being substantially constant.
Inventors
- 👤 Eric Jourdan-Laforte
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 22:22
CPC Classifications
C; C02; C02F; C02F1/00; C02F1/72; C01; C01B; C01B15/00; C01B15/055; C01B15/06; C02F1/722
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
189 words
A PROCESS FOR OBTAINING MONOPEROXYSULPPHURIC ACID FROM HYDROGEN PEROXIDE AND ULPHURIC ACID AND AUTOMATICALLY CONTROLLING THE CONTENT OF OXIDIZABLE IMPURITY IN AN AQUEOUS MEDIUM BY OXIDIZING THE IMPURITY WITH THE MONOPEROXYSULPHURIC ACID, COMPRISING: SIMULTANEOUSLY ADDING TO A REACTION VESSEL (1) HYDROGEN PEROXIDE IN THE FORM OF AN AQUEOUS SOLUTION WITH A CONCENTRATION RANGING FROM 35-100% AND (2) CONCENTRATED SULPHURIC ACID OR FUMING SULPHURIC ACID, MAINTAINING THE TEMPERATURE IN THE REACTION VESSEL IN THE RANGE OF - 10* C TO +80* C, ALLOWING THE CONTENTS OF THE REACTION VESSEL TO OVERFLOW INTO THE AQUEOUS MEDIUM HAVING OXIDIZABLE IMPURITY THEREIN, MONITORING THE OXIDIZABLE IMPURITY CONTENT OF THE AQUEOUS MEDIUM DOWNSTREAM OF THE POINT OF ENTRY OF SAID OVERFLOW INTO THE AQUEOUS MEDIUM, AND CONTROLLING THE AMOUNT OF REACTANTS ADDED IN SAID ADDING STEP IN RESPONSE TO THE CONCENTRATION OF THE OXIDIZABLE IMPURITY MONITORED IN SAID MONITORING STEP, WHEREBY THE SUPPLY OF HYDROGEN PEROXIDE AND SULPHURIC ACID TO THE RACTION VESSEL SO CONTROLLED THAT THE GENERATION OF MONOPEROXYSULPHURIC ACID OCCURS ONLY WHEN REQUIRED AND THE QUANTITY THEROF PRODUCED IS ADJUSTED ACCORDING TO THE QUANTITY THEREOF REQUIRED OR REACTION WITH SAID OXIDIZABLE IMPURETY.
Claim 2
Dependent Claim
189 words
A PROCESS FOR OBTAINING MONOPEROXYSULPPHURIC ACID FROM HYDROGEN PEROXIDE AND ULPHURIC ACID AND AUTOMATICALLY CONTROLLING THE CONTENT OF OXIDIZABLE IMPURITY IN AN AQUEOUS MEDIUM BY OXIDIZING THE IMPURITY WITH THE MONOPEROXYSULPHURIC ACID, COMPRISING: SIMULTANEOUSLY ADDING TO A REACTION VESSEL (1) HYDROGEN PEROXIDE IN THE FORM OF AN AQUEOUS SOLUTION WITH A CONCENTRATION RANGING FROM 35-100% AND (2) CONCENTRATED SULPHURIC ACID OR FUMING SULPHURIC ACID, MAINTAINING THE TEMPERATURE IN THE REACTION VESSEL IN THE RANGE OF - 10* C TO +80* C, ALLOWING THE CONTENTS OF THE REACTION VESSEL TO OVERFLOW INTO THE AQUEOUS MEDIUM HAVING OXIDIZABLE IMPURITY THEREIN, MONITORING THE OXIDIZABLE IMPURITY CONTENT OF THE AQUEOUS MEDIUM DOWNSTREAM OF THE POINT OF ENTRY OF SAID OVERFLOW INTO THE AQUEOUS MEDIUM, AND CONTROLLING THE AMOUNT OF REACTANTS ADDED IN SAID ADDING STEP IN RESPONSE TO THE CONCENTRATION OF THE OXIDIZABLE IMPURITY MONITORED IN SAID MONITORING STEP, WHEREBY THE SUPPLY OF HYDROGEN PEROXIDE AND SULPHURIC ACID TO THE RACTION VESSEL SO CONTROLLED THAT THE GENERATION OF MONOPEROXYSULPHURIC ACID OCCURS ONLY WHEN REQUIRED AND THE QUANTITY THEROF PRODUCED IS ADJUSTED ACCORDING TO THE QUANTITY THEREOF REQUIRED OR REACTION WITH SAID OXIDIZABLE IMPURETY.
Claim 3
Dependent Claim
34 words
A process in accordance with claim 1 wherein, in said adding step, addition of fixed proportions of hydrogen peroxide to sulphuric acid are added whenever said adding step is activated by said controlling step.
Claim 4
Dependent Claim
33 words
A process in accordance with claim 1, further including the steps of: adding alkali agent to the aqueous medium in a quantity controlled to exactly neutralize the monoperoxysulphuric acid entering the aqueous medium.
Claim 5
Dependent Claim
37 words
A process in accordance with claim 3, wherein said controlling step further serves to control the amount of alkali agent added to the aqueous medium to a predetermined proportion of the reactants added to the reaction vessel.
Claim 6
Dependent Claim
75 words
A process according to claim 1, wherein the oxidizable impurity is the CN anion in the form of a simple or complex cyanide, and wherein said monitoring step comprises monitoring the sudden variation in the potential at the terminals of a pair of redox electrodes, said variations occurring according to whether the medium is reducing in the presence of traces of CN ion or oxidizing in the presence of a slight excess of monoperoxysulphuric anion.
Claim 7
Dependent Claim
146 words
A process for treating an aqueous medium containing oxidizable impurities, which process comprises measuring continuously the concentration of said oxidizable impurities in said aqueous medium and, when the measurements indicate that the concentration of said oxidizable impurities exceeds a predetermined value, introducing into said aqueous medium from a reaction vessel, monoperoxysulphuric acid in a quantity just sufficient to oxidize said oxidizable impurities, said monoperoxysulphuric acid being formed by adding simultaneously to said reaction vessel hydrogen peroxide in the form of an aqueous solution with a concentratIon ranging from 50% to 100% and one of concentrated sulphuric acid and fuming sulphuric acid, the temperature of the reaction being maintained in the range of -10*C to +80* C. and the supply of said hydrogen peroxide and sulphuric acid to said reactor occurring only when said measurements indicate that the concentration of said oxidizable impurities exceeds said predetermined value.
Claim 8
Dependent Claim
146 words
A process for treating an aqueous medium containing oxidizable impurities, which process comprises measuring continuously the concentration of said oxidizable impurities in said aqueous medium and, when the measurements indicate that the concentration of said oxidizable impurities exceeds a predetermined value, introducing into said aqueous medium from a reaction vessel, monoperoxysulphuric acid in a quantity just sufficient to oxidize said oxidizable impurities, said monoperoxysulphuric acid being formed by adding simultaneously to said reaction vessel hydrogen peroxide in the form of an aqueous solution with a concentratIon ranging from 50% to 100% and one of concentrated sulphuric acid and fuming sulphuric acid, the temperature of the reaction being maintained in the range of -10*C to +80* C. and the supply of said hydrogen peroxide and sulphuric acid to said reactor occurring only when said measurements indicate that the concentration of said oxidizable impurities exceeds said predetermined value.
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) | 1978-08-18 | 1979-02-17 | 1979-08-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-08-18 | 1983-02-17 | 1983-08-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-08-18 | 1987-02-17 | 1987-08-19 | $7700.00 | Window Closed / Lapsed |