Patent US4180628A successfully refreshed from Google Patents.
US4180628A
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Resin for sorption of tungsten
Assignee: United States Department of the Interior
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Filing: 1978-07-18
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Granted: 1979-12-25
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Expires: 1998-07-18
Abstract
Abstract A resin for sorption of tungsten is prepared by copolymerization of 8-hydroxyquinoline, a polyamine, resorcinol and formaldehyde. The resin finds particular utility for recovery of tungsten from alkaline brines.
Inventors
- 👤 Wayne N. Marchant
- 👤 Parkman T. Brooks
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 20:15
CPC Classifications
C; C08; C08G; C08G14/00; C08G14/02; C08G14/04; C08G14/06; B; B01; B01J; B01J20/00; B01J20/22; C22; C22B; C22B3/00; C22B3/20; C22B3/42; Y; Y02; Y02P; Y02P10/00; Y02P10/20
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
134 words
A method for preparation of a resin suitable for sorption of tungsten from aqueous solution comprising copolymerizing at a temperature of about 35° to 75° C. (1) 8-hydroxyquinoline, (2) about 0.1 to 0.5 moles of a polyamine from the group consisting of ethylenediamine, diethylenetriamine, triethylenetetramine and tetraethylenepentamine per mole of the 8-hydroxyquinoline, (3) about 0.8 to 1.5 moles of resorcinol per mole of the 8-hydroxyquinoline and (4) about 6 to 9 moles of formaldehyde per mole of the 8-hydroxyquinoline, the polymerization being carried out in aqueous media containing sufficient base to provide a pH of about 12 to 14, for a time sufficient to form a firm gel of the copolymer, and subsequently curing said gel at a temperature of about 80° to 115° C. for a time sufficient to complete the polymerization reaction.
Claim 2
Independent Claim
134 words
A method for preparation of a resin suitable for sorption of tungsten from aqueous solution comprising copolymerizing at a temperature of about 35° to 75° C. (1) 8-hydroxyquinoline, (2) about 0.1 to 0.5 moles of a polyamine from the group consisting of ethylenediamine, diethylenetriamine, triethylenetetramine and tetraethylenepentamine per mole of the 8-hydroxyquinoline, (3) about 0.8 to 1.5 moles of resorcinol per mole of the 8-hydroxyquinoline and (4) about 6 to 9 moles of formaldehyde per mole of the 8-hydroxyquinoline, the polymerization being carried out in aqueous media containing sufficient base to provide a pH of about 12 to 14, for a time sufficient to form a firm gel of the copolymer, and subsequently curing said gel at a temperature of about 80° to 115° C. for a time sufficient to complete the polymerization reaction.
Claim 3
Dependent Claim
11 words
The method of claim 1 in which the polyamine is ethylenediamine.
Claim 4
Dependent Claim
12 words
The method of claim 1 in which the base is sodium hydroxide.
Claim 5
Dependent Claim
59 words
The method of claim 1 in which the polymerization reaction is carried out in two stages, the first stage consisting of reaction of the 8-hydroxyquinoline with the polyamine and a portion of the formaldehyde to form a polymer solution, and the second stage consisting of reaction of said polymer solution with the resorcinol and the balance of the formaldehyde.
Claim 6
Dependent Claim
24 words
The method of claim 4 in which the first stage of the polymerization reaction is carried out at a temperature below about 45° C.
Claim 7
Dependent Claim
9 words
A resin prepared by the method of claim 1.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1982-12-24 | 1983-06-25 | 1983-12-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1986-12-24 | 1987-06-25 | 1987-12-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1990-12-24 | 1991-06-25 | 1991-12-25 | $7700.00 | Window Closed / Lapsed |