US3920545A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Ion exchange of metals from aqueous solutions
Assignee: Marathon Oil Co
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Filing: 1973-11-02
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Granted: 1975-11-18
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Expires: 1993-11-02
Abstract
Abstract Metals can be removed from aqueous solutions by contacting such solutions with a composition formed by reacting polyisocyanurate salts with synthetic resins. The resulting composition contains polyisocyanurate salt groups which act as exchange sites for removing the metals from solution. Regeneration by treatment with suitable inorganic metal salts and use of chloromethylated synthetic resins in the forming of the polymer are utilized in preferred embodiments.
Inventors
- 👤 Perry A Argabright
- 👤 Larry M Echelberger
- 👤 Brian L Phillips
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 10:30
CPC Classifications
B; B01; B01J; B01J39/00; B01J39/04; B01J39/08; B01J39/16; B01J39/18; C; C02; C02F; C02F1/00; C02F1/52; C02F1/5272
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
44 words
A METHOD FOR THE REMOVAL OF METALS BY ION EXCHANGE FROM AQUEOUS SOLUTIONS COMPRISING IN COMBINATION THE STEPS OF: A. CONTACTING IN A REACTION MEDIA A POLYISOCYANURATE SALT HAVING METAL CATION GROUPS AND ALSO HAVING REACTIVE NEGATIVELY CHARGED NITROGEN ATOMS AND HAVING THE STRUCTURE
Claim 2
Independent Claim
44 words
A METHOD FOR THE REMOVAL OF METALS BY ION EXCHANGE FROM AQUEOUS SOLUTIONS COMPRISING IN COMBINATION THE STEPS OF: A. CONTACTING IN A REACTION MEDIA A POLYISOCYANURATE SALT HAVING METAL CATION GROUPS AND ALSO HAVING REACTIVE NEGATIVELY CHARGED NITROGEN ATOMS AND HAVING THE STRUCTURE
Claim 3
Dependent Claim
39 words
A process according to claim 1 additionally comprising: d. periodically removing said ion exchange composition from contact with said aqueous solution and e. contacting said composition with inorganic salts to displace said metals and regenerate said reactive anionic sites.
Claim 4
Dependent Claim
14 words
A process according to claim 1 wherein said synthetic resin is a chloromethylated polystyrene.
Claim 5
Dependent Claim
31 words
A process according to claim 1 wherein said metals are selected from the group consisting of Hg, Ba, Al, Zn, Fe, Cr, Co, Ni, Pb, Sn, and mixtures of the foregoing.
Claim 6
Dependent Claim
20 words
A process according to claim 1 wherein said metals are selected from the group consisting of Hg, Ba, and Pb.
Claim 7
Dependent Claim
11 words
A process according to claim 1 wherein said metals comprise Hg.
Claim 8
Dependent Claim
50 words
A process according to claim 1 wherein said ion exchange composition is added to said aqueous solutions to give a ratio equivalent to from about 0.5 to about 5 moles of basic isocyanurate salt groups contained in said ion exchange composition per mole of metal present in said aqueous solutions.
Claim 9
Dependent Claim
47 words
A process according to claim 5 wherein said composition is added to said aqueous solutions in a ratio equivalent to from about 0.5 to about 5 moles of basic isocyanurate salt groups contained in said ion exchange composition per mole of metal present in said aqueous solutions.
Claim 10
Independent Claim
44 words
A method for the removal of metals by ion exchange from aqueous solutions comprising in combination the steps of: a. contacting in a reaction media a polyisocyanurate salt having metal cation groups and also having reactive negatively charged nitrogen atoms and having the structure
Claim 11
Independent Claim
44 words
A method for the removal of metals by ion exchange from aqueous solutions comprising in combination the steps of: a. contacting in a reaction media a polyisocyanurate salt having metal cation groups and also having reactive negatively charged nitrogen atoms and having the structure
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) | 1978-11-17 | 1979-05-19 | 1979-11-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-11-17 | 1983-05-19 | 1983-11-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-11-17 | 1987-05-19 | 1987-11-18 | $7700.00 | Window Closed / Lapsed |