US3806591A
Expired / Lapsed
US
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Preparation of group viii metal compounds
Assignee: Johnson Matthey PLC
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Filing: 1972-06-19
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Granted: 1974-04-23
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Expires: 1992-06-19
Abstract
Abstract This invention describes a method of preparing a hydroxide of a Group VIII metal and in particular a method for preparing hydrated nickel sesquioxide. Basically the invention comprises treating a solution of a compound of the metal in a low valency state with a peroxydisulphate and thereafter adjusting the pH of the solution so as to effect the precipitation of a hydroxide of the Group VIII metal in the higher valency state.
Inventors
- 👤 W Westwood
- 👤 F Lever
- 👤 Gregor J Mac
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 18:14
CPC Classifications
C; C01; C01G; C01G55/00; C01G55/004; C01G49/00; C01G49/02; C01G49/06; C01G51/00; C01G51/05; C01G53/00; C01G53/05; C01P; C01P2006/00; C01P2006/60
Claims Analysis
Total Claims: 1
Claim 1
Independent Claim
122 words
A method for the production of filterable, finely divided, halogen-free nickelic hydroxide from nickel (II) sulphate in a yield of at least 90 percent consisting essentially of: a. dissolving nickel (II) sulphate in water; b. adjusting the pH of the solution to lie within the range 4-6 by the addition of dilute sodium hydroxide solution; c. increasing the temperature to lie within the range 70-90*C; d. adding a slight stoichiometric excess of sodium peroxydisulphate in aqueous solution; e. allowing the mixture to stand; f. adding, with stirring, a further quantity of aqueous sodium hydroxide solution sufficient to provide three hydroxyl groups for each nickel atom; g. allowing the resulting mixture to stand with further stirring; h. filtering and washing with cold water.
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) | 1977-04-22 | 1977-10-22 | 1978-04-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-04-22 | 1981-10-22 | 1982-04-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-04-22 | 1985-10-22 | 1986-04-23 | $7700.00 | Window Closed / Lapsed |