US4284512A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Iron selective resins prepared from a phenol, HCHO and a di-secondary amine
Assignee: Commonwealth Scientific and Industrial Research Organisation
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Filing: 1979-12-03
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Granted: 1981-08-18
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Expires: 1999-12-03
Abstract
Abstract Ferric ions may be removed very selectively from aqueous solutions by means of a metal-chelating resin consisting of the acid-quaternized form of a cross-linked polymer produced by the condensation of a phenolic component comprising one or more phenols, formaldehyde, and a diamino component comprising one or more di-(secondary amino) compounds under neutral conditions. The resin is prepared by treating the cross-linked polymer with an aqueous solution of a strong mineral acid.
Inventors
- 👤 Jonathan H. Hodgkin
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 17:18
CPC Classifications
C; C08; C08G; C08G14/00; C08G14/02; C08G14/04; C08G14/12; B; B01; B01J; B01J45/00; C08G14/06; C22; C22B; C22B3/00; C22B3/20; C22B3/42; Y; Y02; Y02P; Y02P10/00; Y02P10/20; Y10; Y10S; Y10S210/00; Y10S210/902; Y10S210/911; Y10S210/912
Claims Analysis
Total Claims: 16
Claim 1
Independent Claim
46 words
A metal-chelating resin, selective for ferric ions and consisting of the acid-quaternized form of cross-linked polymer produced by the condensation of a phenolic component comprising one or more phenols, formaldehyde, and a diamino component consisting essentially of one or more di(secondary amino) compounds under neutral conditions.
Claim 2
Dependent Claim
46 words
A metal-chelating resin, selective for ferric ions and consisting of the acid-quaternized form of cross-linked polymer produced by the condensation of a phenolic component comprising one or more phenols, formaldehyde, and a diamino component consisting essentially of one or more di(secondary amino) compounds under neutral conditions.
Claim 3
Dependent Claim
13 words
A resin as claimed in claim 1, quaternized with a strong mineral acid.
Claim 4
Dependent Claim
13 words
A resin as claimed in claim 2, wherein the acid is sulphuric acid.
Claim 5
Dependent Claim
31 words
A resin as claimed in claim 1, wherein the diamino component comprises one or more di-(secondary amino) compounds in which each secondary amino group forms part of a saturated heterocyclic ring.
Claim 6
Dependent Claim
14 words
A resin as claimed in claim 4, wherein amino component is piperazine or 4,4'-bipiperidine.
Claim 7
Dependent Claim
41 words
A resin as claimed in claim 1, wherein the phenolic component comprises one or more compounds selected from the group consisting of hydroxybenzene and hydroxybenzenes having C 1 to C 3 alkyl substituents in the 3 and/or 3 and 5 positions.
Claim 8
Dependent Claim
21 words
A resin as claimed in claim 6, wherein the phenolic component is selected from the group consisting of hydroxybenzene and 3-ethyl-1-hydroxybenzene.
Claim 9
Dependent Claim
23 words
A resin as claimed in claim 1, wherein the phenolic component includes a bisphenol, bisphenol sulphide or bisphenol sulphoxide as a crosslinking agent.
Claim 10
Dependent Claim
47 words
A resin as claimed in claim 1, wherein the diamino component is piperazine and the polymer has the structure ##STR2## where R' and R'" are independently lower (C 1 -C 3 ) alkyl groups or hydrogen atoms and R" is a hydrogen atom or a crosslinking group.
Claim 11
Independent Claim
67 words
A method for preparing an iron-selective metal-chelating resin which comprises treating a cross-linked polymer, with an aqueous solution of a strong mineral acid, said polymer having been prepared by condensing approximately equimolar quantities of a phenolic component comprising one or more phenols, and a diamino component consisting essentially of one or more di-(secondary amino) compounds with approximately twice the molar quantity of formaldehyde under Mannich reaction conditions.
Claim 12
Independent Claim
67 words
A method for preparing an iron-selective metal-chelating resin which comprises treating a cross-linked polymer, with an aqueous solution of a strong mineral acid, said polymer having been prepared by condensing approximately equimolar quantities of a phenolic component comprising one or more phenols, and a diamino component consisting essentially of one or more di-(secondary amino) compounds with approximately twice the molar quantity of formaldehyde under Mannich reaction conditions.
Claim 13
Dependent Claim
19 words
A method as claimed in claim 10, wherein the aqueous acid is sulphuric acid of about 2 N concentration.
Claim 14
Dependent Claim
26 words
A method for the selective removal of ferric ions from an aqueous solution which comprises contacting the solution with a resin as claimed in claim 1.
Claim 15
Dependent Claim
22 words
A method as claimed in claim 12, wherein the iron-loaded resin is subsequently treated with a complexing agent to remove the iron.
Claim 16
Dependent Claim
14 words
A method as claimed in claim 13, wherein the complexing agent is hydrochloric acid.
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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) | 1984-08-17 | 1985-02-16 | 1985-08-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1988-08-17 | 1989-02-16 | 1989-08-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1992-08-17 | 1993-02-16 | 1993-08-18 | $7700.00 | Window Closed / Lapsed |