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US4174253A
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Dissolution of metals utilizing a H2 O2 -H2 SO4 solution catalyzed with hydroxy substituted cycloparaffins
Assignee: Plastic Specialties and Technologies Inc
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Filing: 1977-11-08
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Granted: 1979-11-13
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Expires: 1997-11-08
Abstract
Abstract Improved metal dissolution rates are obtained when using a solution containing sulfuric acid, hydrogen peroxide and an effective amount of a mono- or dihydroxy-substituted cycloparaffin.
Inventors
- 👤 Moenes L. Elias
- 👤 Philip D. Readio
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 09:09
CPC Classifications
C; C23; C23F; C23F1/00; C23F1/10; C23F1/14; C23F1/16
Claims Analysis
Total Claims: 25
Claim 1
Independent Claim
156 words
In a process for the dissolution of metal in which a metal is contacted with an aqueous solution containing from about 0.2 to about 4.5 gram moles per liter of sulfuric acid, from about 0.25 to about 8 gram moles per liter of hydrogen peroxide, the method of increasing the metal dissolution rate of the solution to a value higher than that obtained by such a solution free of any chloride and bromide ions, which method comprises adding at least about 0.085 and up to 0.5 gram moles per liter of the solution of a promoter selected from: (a) monohydroxy or dihydroxy-substituted cycloparaffins containing from 5 to 7 carbon atoms in the ring structure, or (b) monohydroxy or dihydroxy-substituted alkylcycloparaffins containing from 5 to 7 carbon atoms in the ring structure, where each of the alkyl groups contains from 1 to 4 carbon atoms and is attached to an unsubstituted carbon atom in the ring structure.
Claim 2
Dependent Claim
156 words
In a process for the dissolution of metal in which a metal is contacted with an aqueous solution containing from about 0.2 to about 4.5 gram moles per liter of sulfuric acid, from about 0.25 to about 8 gram moles per liter of hydrogen peroxide, the method of increasing the metal dissolution rate of the solution to a value higher than that obtained by such a solution free of any chloride and bromide ions, which method comprises adding at least about 0.085 and up to 0.5 gram moles per liter of the solution of a promoter selected from: (a) monohydroxy or dihydroxy-substituted cycloparaffins containing from 5 to 7 carbon atoms in the ring structure, or (b) monohydroxy or dihydroxy-substituted alkylcycloparaffins containing from 5 to 7 carbon atoms in the ring structure, where each of the alkyl groups contains from 1 to 4 carbon atoms and is attached to an unsubstituted carbon atom in the ring structure.
Claim 3
Dependent Claim
27 words
The method of claim 1, wherein the aqueous solution contains sodium phenolsulfonate as a stabilizer to reduce the degrading effect of heavy metal ions on hydrogen peroxide.
Claim 4
Dependent Claim
22 words
The method of claim 1, wherein the hydrogen peroxide concentration is maintained between about 1 and about 4 gram moles per liter.
Claim 5
Dependent Claim
22 words
The method of claim 1, wherein the sulfuric acid concentration is maintained between about 0.3 and about 4 gram moles per liter.
Claim 6
Dependent Claim
10 words
The method of claim 1, wherein the promoter is cyclopentanol.
Claim 7
Dependent Claim
10 words
The method of claim 1, wherein the promoter is cyclohexanol.
Claim 8
Dependent Claim
10 words
The method of claim 1, wherein the promoter is cycloheptanol.
Claim 9
Dependent Claim
10 words
The method of claim 1, wherein the promoter is 1,2-cyclohexanediol.
Claim 10
Dependent Claim
10 words
The method of claim 1, wherein the promoter is 1,3-cyclohexanediol.
Claim 11
Dependent Claim
10 words
The method of claim 1, wherein the promoter is 1,4-cyclohexanediol.
Claim 12
Dependent Claim
15 words
The method of claim 1, wherein the metal is copper or an alloy of copper.
Claim 13
Dependent Claim
25 words
The method of claim 1 carried out in the presence of chloride or bromide ions in excess of 2 ppm and up to 50 ppm.
Claim 14
Dependent Claim
145 words
In a composition for metal dissolution comprising an aqueous solution of from about 0.2 to about 4.5 gram moles per liter of sulfuric acid and from about 0.25 to about 8 gram moles per liter of hydrogen peroxide, the addition of at least about 0.085 and up to 0.5 gram moles per liter of a promoter for increasing metal dissolution rate of the solution to a value higher than that obtained by such a solution free of any chloride or bromide ions, which promoter is selected from: (a) monohydroxy or dihydroxy-substituted cycloparaffins containing from 5 to 7 carbon atoms in the ring structure, or (b) monohydroxy or dihydroxy-substituted alkylcycloparaffins containing from 5 to 7 carbon atoms in the ring structure, where each of the alkyl groups contains from 1 to 4 carbon atoms and is attached to an unsubstituted carbon atom in the ring structure.
Claim 15
Dependent Claim
145 words
In a composition for metal dissolution comprising an aqueous solution of from about 0.2 to about 4.5 gram moles per liter of sulfuric acid and from about 0.25 to about 8 gram moles per liter of hydrogen peroxide, the addition of at least about 0.085 and up to 0.5 gram moles per liter of a promoter for increasing metal dissolution rate of the solution to a value higher than that obtained by such a solution free of any chloride or bromide ions, which promoter is selected from: (a) monohydroxy or dihydroxy-substituted cycloparaffins containing from 5 to 7 carbon atoms in the ring structure, or (b) monohydroxy or dihydroxy-substituted alkylcycloparaffins containing from 5 to 7 carbon atoms in the ring structure, where each of the alkyl groups contains from 1 to 4 carbon atoms and is attached to an unsubstituted carbon atom in the ring structure.
Claim 16
Dependent Claim
24 words
The composition of claim 13, additionally containing sodium phenosulfonate as a stabilizer for reducing the degrading effect of heavy metal ions on hydrogen peroxide.
Claim 17
Dependent Claim
22 words
The composition of claim 13, wherein the hydrogen peroxide concentration is maintained between about 1 and about 4 gram moles per liter.
Claim 18
Dependent Claim
21 words
The composition of claim 13, wherein the sulfuric acid concentration is maintained about 0.3 and about 4 gram moles per liter.
Claim 19
Dependent Claim
10 words
The composition of claim 13, wherein the promoter is cyclopentanol.
Claim 20
Dependent Claim
10 words
The composition of claim 13, wherein the promoter is cyclohexanol.
Claim 21
Dependent Claim
10 words
The composition of claim 13, wherein the promoter is cycloheptanol.
Claim 22
Dependent Claim
10 words
The composition of claim 13, wherein the promoter is 1,2-cyclohexanediol.
Claim 23
Dependent Claim
10 words
The composition of claim 13, wherein the promoter is 1,3-cyclohexanediol.
Claim 24
Dependent Claim
10 words
The composition of claim 13, wherein the promoter is 1,4-cyclohexanediol.
Claim 25
Dependent Claim
22 words
The composition of claim 13 containing free chloride or bromide ions in excess of 2 ppm and up to about 50 ppm.
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) | 1982-11-12 | 1983-05-14 | 1983-11-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1986-11-12 | 1987-05-14 | 1987-11-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1990-11-12 | 1991-05-14 | 1991-11-13 | $7700.00 | Window Closed / Lapsed |