US4158592A
Expired / Lapsed
US
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Dissolution of metals utilizing a H2 O2 -sulfuric acid solution catalyzed with ketone compounds
Assignee: Dart Industries Inc
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Filing: 1977-11-08
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Granted: 1979-06-19
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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 ketone soluble in the solution.
Inventors
- 👤 Philip D. Readio
- 👤 John L. H. Allan
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 05:07
CPC Classifications
C; C23; C23F; C23F1/00; C23F1/10; C23F1/14; C23F1/16; H; H05; H05K; H05K3/00; H05K3/02; H05K3/06; H05K3/067
Claims Analysis
Total Claims: 25
Claim 1
Independent Claim
97 words
A method of metal dissolution which comprises contacting a metal 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 and an effective amount of a ketone additive soluble in the solution, which additive is selected from the group consisting of: (a) unsubstituted or substituted monoalkanones selected from acetone, methyl ethyl ketone, diethyl ketone, methyl propyl ketone, diisopropyl ketone, methyl isobutyl ketone and diisobutyl ketone; (b) cyclic monoalkanones selected from cyclopentanone and cyclohexanone, and (c) 2,3-butanedione.
Claim 2
Independent Claim
97 words
A method of metal dissolution which comprises contacting a metal 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 and an effective amount of a ketone additive soluble in the solution, which additive is selected from the group consisting of: (a) unsubstituted or substituted monoalkanones selected from acetone, methyl ethyl ketone, diethyl ketone, methyl propyl ketone, diisopropyl ketone, methyl isobutyl ketone and diisobutyl ketone; (b) cyclic monoalkanones selected from cyclopentanone and cyclohexanone, and (c) 2,3-butanedione.
Claim 3
Dependent Claim
23 words
The method of claim 1, wherein the ketone additive is provided at a concentration of at least about 0.01 gram moles per liter.
Claim 4
Dependent Claim
27 words
The method of claim 1, wherein the ketone additive is provided at a concentration in the range from about 0.1 to about 0.5 gram moles per liter.
Claim 5
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 6
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 7
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 8
Dependent Claim
15 words
The method of claim 1, wherein the metal is copper or an alloy of copper.
Claim 9
Dependent Claim
10 words
The method of claim 1, wherein the ketone is acetone.
Claim 10
Dependent Claim
12 words
The method of claim 1, wherein the ketone is methyl ethyl ketone.
Claim 11
Dependent Claim
10 words
The method of claim 1, wherein the ketone is 2,3-butanedione.
Claim 12
Dependent Claim
10 words
The method of claim 1, wherein the ketone is 4-methyl-2-pentanone.
Claim 13
Dependent Claim
11 words
The method of claim 1, wherein the ketone is diisobutyl ketone.
Claim 14
Dependent Claim
92 words
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, from about 0.25 to about 8 gram moles per liter of hydrogen peroxide and an effective amount of a ketone additive soluble in the solution, which additive is selected from the group consisting of: (a) unsubstituted or substituted monoalkanones selected from acetone, methyl ethyl ketone, diethyl ketone, methyl propyl ketone, diisopropyl ketone, methyl isobutyl ketone and diisobutyl ketone; (b) cyclic monoalkanones selected from cyclopentanone and cyclohexanone, and (c) 2,3-butanedione.
Claim 15
Dependent Claim
92 words
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, from about 0.25 to about 8 gram moles per liter of hydrogen peroxide and an effective amount of a ketone additive soluble in the solution, which additive is selected from the group consisting of: (a) unsubstituted or substituted monoalkanones selected from acetone, methyl ethyl ketone, diethyl ketone, methyl propyl ketone, diisopropyl ketone, methyl isobutyl ketone and diisobutyl ketone; (b) cyclic monoalkanones selected from cyclopentanone and cyclohexanone, and (c) 2,3-butanedione.
Claim 16
Dependent Claim
23 words
The composition of claim 13, wherein the ketone additive is provided at a concentration of at least about 0.01 gram moles per liter.
Claim 17
Dependent Claim
26 words
The composition of claim 13, wherein the additive is provided at a concentration in the range from about 0.1 to about 0.5 gram moles per liter.
Claim 18
Dependent Claim
24 words
The composition of claim 13, additionally containing sodium phenolsulfonate as a stabilizer for reducing the degrading effect of heavy metal ions on hydrogen peroxide.
Claim 19
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 20
Dependent Claim
22 words
The composition of claim 13, wherein the sulfuric acid concentration is maintained between about 0.3 and about 4 gram moles per liter.
Claim 21
Dependent Claim
10 words
The composition of claim 13, wherein the ketone is acetone.
Claim 22
Dependent Claim
12 words
The composition of claim 13, wherein the ketone is methyl ethyl ketone.
Claim 23
Dependent Claim
10 words
The composition of claim 13, wherein the ketone is 2,3-butanedione.
Claim 24
Dependent Claim
10 words
The composition of claim 13, wherein the ketone is 4-methyl-2-pentanone.
Claim 25
Dependent Claim
11 words
The composition of claim 13, wherein the ketone is diisobutyl ketone.
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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) | 1982-06-18 | 1982-12-18 | 1983-06-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1986-06-18 | 1986-12-18 | 1987-06-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1990-06-18 | 1990-12-18 | 1991-06-19 | $7700.00 | Window Closed / Lapsed |