US4559216A
Expired / Lapsed
US
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Method for purification of sulfuric acid solution
Assignee: Unitika Ltd
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Filing: 1984-03-05
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Granted: 1985-12-17
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Expires: 2004-03-05
Abstract
Abstract A method for purification of a sulfuric acid solution such as, for example, a copper electrolyte which entrains at least one metal ion species selected from the group consisting of antimony ions, bismuth ions, and iron ions and having a sulfuric acid concentration of at least 50 g/liter is disclosed. The method comprises exposing the sulfuric acid solution to a chelating resin possessing aminomethylenephosphonic acid group as a chelate forming group thereby effecting adsorptive separation of the aforementioned at least one metal ion species from the solution. By the method described above, the antimony ions, bismuth ions, and/or iron ions contained as impurities in the copper electrolyte can be easily and efficiently separated out of the system without entailing any ecological problem.
Inventors
- 👤 Tadao Nagai
- 👤 Yoshiaki Echigo
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 12:54
CPC Classifications
B; B01; B01D; B01D15/00; B01J; B01J45/00; C; C01; C01B; C01B17/00; C01B17/69; C01B17/90; C01B17/901; C01B17/904; C01B17/908; C02; C02F; C02F1/00; C02F1/28; C02F1/285; G; G05; G05D; G05D3/00; G05D3/12; Y; Y10; Y10S; Y10S204/00; Y10S204/13
Claims Analysis
Total Claims: 16
Claim 1
Independent Claim
169 words
A method for purification of a sulfuric acid solution entraining a metal ion species selected from the group consisting of antimony ions, bismuth ions, or at least two metal ion species selected from the group consisting of antimony ions, bismuth ions and iron ions, and containing at least 50 g of sulfuric acid per liter, comprising: exposing the sulfuric acid solution to a chelating resin possessing a group having methylene-phosphonic acid group substituted for a hydrogen atom or a primary or secondary alkylamino group incorporated as a chelate forming group into a resin matrix to effect adsorption on the chelating resin; and allowing the chelating resin to separate the metal ion species adsorbed on the chelating resin from the sulfuric acid solution, wherein the metal ion species separated by adsorption on the chelating resin is a metal ion species selected from the group consisting of antimony ions, bismuth ions or at least two metal ion species selected from the group consisting of antimony ions, bismuth ions and iron ions.
Claim 2
Independent Claim
169 words
A method for purification of a sulfuric acid solution entraining a metal ion species selected from the group consisting of antimony ions, bismuth ions, or at least two metal ion species selected from the group consisting of antimony ions, bismuth ions and iron ions, and containing at least 50 g of sulfuric acid per liter, comprising: exposing the sulfuric acid solution to a chelating resin possessing a group having methylene-phosphonic acid group substituted for a hydrogen atom or a primary or secondary alkylamino group incorporated as a chelate forming group into a resin matrix to effect adsorption on the chelating resin; and allowing the chelating resin to separate the metal ion species adsorbed on the chelating resin from the sulfuric acid solution, wherein the metal ion species separated by adsorption on the chelating resin is a metal ion species selected from the group consisting of antimony ions, bismuth ions or at least two metal ion species selected from the group consisting of antimony ions, bismuth ions and iron ions.
Claim 3
Dependent Claim
47 words
A method as claimed in claim 1, wherein the chelating resin is a phenolic chelating resin which possesses a group having a methylenephosphonic acid group substituted for a hydrogen atom of a primary or secondary alkylamino group incorporated as a chelate forming group in the phenol ring.
Claim 4
Dependent Claim
29 words
A method as claimed in claim 1, wherein the sulfuric acid solution further entrains a species selected from the group consisting of copper ions, nickel ions, and arsenic ions.
Claim 5
Dependent Claim
16 words
A method as claimed in claim 1, wherein the sulfuric acid solution is a copper electrolyte.
Claim 6
Dependent Claim
63 words
A method as claimed in claim 1, wherein the metal ion species selected from the group consisting of antimony ions, bismuth ions, or at least two metal ion species selected from the group consisting of antimony ions, bismuth ions and iron ions, and adsorbed on the chelating resin is eluted with an aqueous hydrochloric acid solution having a normality of at least 1.
Claim 7
Dependent Claim
23 words
A method as claimed in claim 5, wherein the aqueous hydrochloric acid solution has a normality in the range of 5.5 to 6.5.
Claim 8
Dependent Claim
20 words
A method as claimed in claim 1, wherein the sulfuric acid solution contains antimony ions, bismuth ions and iron ions.
Claim 9
Dependent Claim
42 words
A method as claimed in claim 1, wherein the chelating resin possesses a group having a plurality of methylenephosphonic acid groups substituted for hydrogen atoms of a primary or secondary alkylamino group incorporated as a chelate forming group into a resin matrix.
Claim 10
Dependent Claim
42 words
A method as claimed in claim 8, wherein the chelating resin possesses a group having methylenephosphonic acid groups substituted for all of the hydrogen atoms of a primary or secondary alkylamino group incorporated as a chelate forming group into a resin matrix.
Claim 11
Dependent Claim
33 words
A method as claimed in claim 1, wherein the chelating resin is a phenolic chelating resin which has an imino-bis(methylenephosphonic acid) as a functional group and uses a phenol-formalin resin as a matrix.
Claim 12
Dependent Claim
46 words
A method as claimed in claim 1, wherein the chelating resin is present in a column and the sulfuric acid solution is passed through the column and exposed to the chelating resin at a rate in the range of SV 0.5 to 20 hr -1 .
Claim 13
Dependent Claim
44 words
A method as claimed in claim 11, wherein the sulfuric acid solution is contacted with the chelating resin at a rate in the range of SV 1 to 5 hr -1 while maintaining a temperature in the range of 18° C. to 80° C.
Claim 14
Dependent Claim
15 words
A method as claimed in claim 1, wherein the sulfuric acid solution entrains antimony ions.
Claim 15
Dependent Claim
15 words
A method as claimed in claim 1, wherein the sulfuric acid solution entrains bismuth ions.
Claim 16
Dependent Claim
18 words
A method as claimed in claim 1, wherein the sulfuric acid solution entrains antimony ions and bismuth ions.
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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) | 1988-12-16 | 1989-06-17 | 1989-12-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1992-12-16 | 1993-06-17 | 1993-12-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1996-12-16 | 1997-06-17 | 1997-12-17 | $7700.00 | Window Closed / Lapsed |