US3839169A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Photooxidizing organic contaminants in aqueous brine solutions
Assignee: Dow Chemical Co
•
Filing: 1973-05-31
•
Granted: 1974-10-01
•
Expires: 1993-05-31
Abstract
Abstract Disclosed herein is a novel, relatively fast method for reducing the concentration of water soluble carboxylic contaminants, (e.g., acetate ion, acetic acid, or salts thereof) in chloride containing brines. The method comprises contacting the brine stream with chlorine and ultraviolet light and controlling the pH of the brine.
Inventors
- 👤 J Moyer
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 16:15
CPC Classifications
B; B01; B01J; B01J19/00; B01J19/08; B01J19/12; B01J19/122; B01J19/123
Claims Analysis
Total Claims: 16
Claim 1
Independent Claim
115 words
IN THE METHOD OF OXIDIZING DISSOLVED ORGANIC COMPOUNDS CONTAINING CARBOXYLIC GROUPS IN AN AQUEOUS SOLUTION WITH CHLORINE WHILE IRRADIATING THE SOLUTION WITH LIGHT HAVING A WAVE LENGTH OF LESS THAN 3,600 A, SAID AQUEOUS SOLUTION CONTAINING LESS THAN OR BEING SUBSTANTIALLY FREE OF AN AMOUNT OF CHLORIDE IONS EFFECTIVE TO INCREASE THE RATE OF REACTION AND REDUCE THE QUANTITY OF CHLORIDE REQUIRED TO OXIDIZE SAIS ORGANIC COMPOUNDS, THE IMPROVEMENT WHICH COMPRISES: DISSOLVING INTO SAID AQUEOUS SOLUTION A SUFFICIENT QUANTITY OF AN ALKALI OR ALKALINE EARTH METAL CHLORIDE TO PROVIDE A SUFFICIENT QUANTITY OF CHLORIDE IONS IN SOLUTION TO INCREASE THE RATE OF OXIDATION AND REDUCE THE QUANTITY OF CHLORINE REQUIRED TO OXIDE SAID ORGANIC COMPOUNDS.
Claim 2
Dependent Claim
115 words
IN THE METHOD OF OXIDIZING DISSOLVED ORGANIC COMPOUNDS CONTAINING CARBOXYLIC GROUPS IN AN AQUEOUS SOLUTION WITH CHLORINE WHILE IRRADIATING THE SOLUTION WITH LIGHT HAVING A WAVE LENGTH OF LESS THAN 3,600 A, SAID AQUEOUS SOLUTION CONTAINING LESS THAN OR BEING SUBSTANTIALLY FREE OF AN AMOUNT OF CHLORIDE IONS EFFECTIVE TO INCREASE THE RATE OF REACTION AND REDUCE THE QUANTITY OF CHLORIDE REQUIRED TO OXIDIZE SAIS ORGANIC COMPOUNDS, THE IMPROVEMENT WHICH COMPRISES: DISSOLVING INTO SAID AQUEOUS SOLUTION A SUFFICIENT QUANTITY OF AN ALKALI OR ALKALINE EARTH METAL CHLORIDE TO PROVIDE A SUFFICIENT QUANTITY OF CHLORIDE IONS IN SOLUTION TO INCREASE THE RATE OF OXIDATION AND REDUCE THE QUANTITY OF CHLORINE REQUIRED TO OXIDE SAID ORGANIC COMPOUNDS.
Claim 3
Dependent Claim
39 words
A process as in claim 1 wherein the pH of the brine is controlled in relation to the pKa value of the carboxylic impurity so that: pKa - 2.5 < or = pH < or = pKa + 1.
Claim 4
Dependent Claim
34 words
A process as in claim 1 wherein the intensity of the irradiation passed into the brine provides from about 0.01 to about 10 watts of light energy per cubic foot of the reaction mixture.
Claim 5
Dependent Claim
17 words
A process as in claim 1 wherein a carboxylic impurity is acetic acid or water-soluble salts thereof.
Claim 6
Dependent Claim
32 words
A process as in claim 1 wherein in the reaction mixture from about 1 to about 1.5 moles of chloride are provided for each mole of carboxylic impurity pResent in the brine.
Claim 7
Dependent Claim
23 words
A process as in claim 1 wherein the concentration of chlorine in the brine is maintained up to about 50 parts per million.
Claim 8
Dependent Claim
24 words
A process as in claim 1 wherein the temperature of the brine is from about 90*C to about the boiling point of the brine.
Claim 9
Dependent Claim
23 words
A process as in claim 1 and including, as an additional step, collecting the chlorinated hydrocarbons produced as a by-product in the process.
Claim 10
Dependent Claim
29 words
A process as in claim 1 wherein the alkali or alkaline earth metal chloride is provided in an amount of at least about 1.0 weight percent of the solution.
Claim 11
Dependent Claim
16 words
A process as in claim 1 wherein the alkali or alkaline metal chloride is sodium chloride.
Claim 12
Dependent Claim
117 words
In the method of oxidizing carboxylic species containing from about two to about 12 carbon atoms and having a pKa value of from about 2 to about 5, dissolved in an aqueous solution containing from about 1 percent by weight to the saturation level of an alkali or alkaline earth metal chloride with chlorine in the presence of light having a wave length of less than about 3, 600 A, the improvement which comprises: maintaining the pH of the solution within a range defined by the formula pKa - 2.5 < or = pH < or = pKa + 1 wherein pKa is the negative logarithm (base 10) of the ionization constant (Ka) of the carboxylic species.
Claim 13
Dependent Claim
117 words
In the method of oxidizing carboxylic species containing from about two to about 12 carbon atoms and having a pKa value of from about 2 to about 5, dissolved in an aqueous solution containing from about 1 percent by weight to the saturation level of an alkali or alkaline earth metal chloride with chlorine in the presence of light having a wave length of less than about 3, 600 A, the improvement which comprises: maintaining the pH of the solution within a range defined by the formula pKa - 2.5 < or = pH < or = pKa + 1 wherein pKa is the negative logarithm (base 10) of the ionization constant (Ka) of the carboxylic species.
Claim 14
Dependent Claim
37 words
The method of claim 11 wherein the concentration of chlorine is controlled during the oxidation reaction to provide from about 1 to about 1.5 moles of chlorine for each mole of carboxylic species present in the solution.
Claim 15
Dependent Claim
18 words
The method of claim 11 wherein the carboxylic species is acetic acid or a water soluble salt thereof.
Claim 16
Dependent Claim
24 words
The method of claim 11 wherein the temperature of the aqueous solution ranges from about 90*C. to about the boiling point of the solution.
References Cited (Backward Citations)
US3469493A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1977-09-30 | 1978-04-01 | 1978-10-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-09-30 | 1982-04-01 | 1982-10-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-09-30 | 1986-04-01 | 1986-10-01 | $7700.00 | Window Closed / Lapsed |