Patent US3673068A successfully refreshed from Google Patents.
US3673068A
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Process for recovering waste acids and metals by electrodialysis
Assignee: Asahi Kasei Corp
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Filing: 1969-12-12
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Granted: 1972-06-27
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Expires: 1989-12-12
Abstract
Abstract A process for recovering a substantial portion of nitric acid and metal ions from an acidic waste liquid produced in the process for the production of adipic acid by oxidizing cyclohexanone or cyclohexanol in a liquid phase, which comprises supplying said waste liquid to an electrodialysis apparatus including one or more electrodializers to recover said nitric acid and metal ions in a recovering liquid of a member selected from water and a diluted aqueous nitric acid.
Inventors
- 👤 Maomi Seko
- 👤 Akira Yomiyama
- 👤 Tetsuya Miyake
- 👤 Hidemaro Iwashita
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 14:10
CPC Classifications
B; B01; B01D; B01D61/00; B01D61/24; B01D61/243; B01D61/244; B01D61/42; B01D61/44
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
35 words
A process according to claim 1 wherein said waste liquid and said recovering liquid obtained in said diffusion dialysis are used as a starting waste liquid and a starting recovering liquid, respectively, in an electrodialysis.
Claim 2
Dependent Claim
21 words
A process according to claim 1 wherein said diffusion dialysis is carried out in a diffusion dializer having a neutral membrane.
Claim 3
Dependent Claim
22 words
A process according to claim 1 wherein said electrodialysis is carried out by contacting said waste liquid with said recovering liquid countercurrently.
Claim 4
Dependent Claim
21 words
A process according to claim 2 wherein said diffusion dialysis is carried out in a diffusion dializer having a neutral membrane.
References Cited (Backward Citations)
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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) | 1975-06-27 | 1975-12-27 | 1976-06-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-06-27 | 1979-12-27 | 1980-06-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-06-27 | 1983-12-27 | 1984-06-27 | $7700.00 | Window Closed / Lapsed |