Patent US2540012A successfully refreshed from Google Patents.
US3637488A
Expired / Lapsed
US
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Removal of inorganic species by liquid membrane
Assignee: ExxonMobil Technology and Engineering Co
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Filing: 1970-05-12
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Granted: 1972-01-25
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Expires: 1990-05-12
Abstract
Abstract Inorganic species are removed from liquid streams such as waste water streams by treatment with an emulsion of reagent-containing aqueous droplets suspended in an organic liquid containing surfactant which forms a membrane around said aqueous droplets. The inorganic species, such as phosphates in waste water will permeate the membrane; the reagent within the droplet is such that it will react with the permeating inorganic species to form a new compound which will precipitate and remain within the droplets. The emulsion is then removed from the system.
Inventors
- 👤 Norman N Li
- 👤 Robert P Cahn
- 👤 Adam L Shrier
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 22:44
CPC Classifications
C; C10; C10G; C10G21/00; B; B01; B01D; B01D61/00; B01D61/38; B01D61/40; C02; C02F; C02F1/00; C02F1/26; C02F1/52; C02F1/5236
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
12 words
The process of claim 1 wherein said solution is an aqueous solution.
Claim 2
Dependent Claim
11 words
The process of claim 1 wherein said ion is calcium ion.
Claim 3
Dependent Claim
11 words
The process of claim 1 wherein said reagent is inorganic phosphate.
Claim 4
Dependent Claim
10 words
The process of claim 1 wherein said reagent is cyanide.
Claim 5
Dependent Claim
21 words
The process of claim 1 wherein the ion capable of reacting with said contaminant is in the form of calcium chloride.
Claim 6
Dependent Claim
18 words
The process of claim 1 wherein said surface active agent is a surface active sorBitan fatty acid ester.
Claim 7
Dependent Claim
112 words
A process for separating inorganic phosphate from an aqueous solution which comprises passing said solution into a contacting zone wherein it is contacted with an emulsion comprising droplets of a mixture, said droplets containing at least one source of calcium ion which is capable of reacting with said phosphate and causing it to precipitate, said droplets being coated in the emulsion with a liquid surfactant containing membrane, said membrane being permeable to said phosphate, passing at least a portion of said phosphate through said liquid membrane, allowing the phosphate ion to react with the calcium ion and forming a precipitate within the droplet and recovering an aqueous phase depleted in said phosphate.
Claim 8
Dependent Claim
16 words
The process of claim 8 wherein said calcium ion is in the form of calcium chloride.
Claim 9
Dependent Claim
16 words
The process of claim 8 wherein said calcium ion is in the form of calcium hydroxide.
Claim 10
Dependent Claim
15 words
The process of claim 8 wherein a magnesium ion is substituted for the calcium ion.
Claim 11
Dependent Claim
15 words
The process of claim 8 wherein the droplet diameter is 10 1 to 105 centimeters.
Claim 12
Dependent Claim
16 words
The process of claim 8 wherein said surface active agent is a sorbitan fatty acid ester.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-01-24 | 1975-07-26 | 1976-01-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-01-24 | 1979-07-26 | 1980-01-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-01-24 | 1983-07-26 | 1984-01-25 | $7700.00 | Window Closed / Lapsed |