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Patent US4657752A successfully refreshed from Google Patents.
US4657752A
Expired / Lapsed
US
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Process for preparing ferrous carbonate
Assignee: Phillips Petroleum Co
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Filing: 1985-04-16
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Granted: 1987-04-14
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Expires: 2005-04-16
Abstract
Abstract A process for the production of ferrous carbonate is provided wherein a mixture of an alkali metal bicarbonate and a ferrous compound such as a ferrous salt in solution is heated to a temperature in the range of about 100° C. to about 300° C. for a sufficient time to allow a precipitate to form. A molar ratio of alkali metal bicarbonate to ferrous compound is at least 2:1, such a ratio giving an extremely pure precipitate of ferrous carbonate.
Inventors
- 👤 William G. Lyon
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 08:33
CPC Classifications
C; C01; C01G; C01G49/00
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
130 words
A process for making ferrous carbonate, said process being carried out in a sealed vessel, wherein said process comprises: (a) heating a mixture of an alkali metal bicarbonate having the formula XHCO 3 , where X is an alkali metal, and a ferrous compound in solution at a temperature in the range of about 100° C. to about 300° C. for a sufficient time to allow the formation of a precipitate, wherein said ferrous compound is capable of reacting in solution with said alkali metal bicarbonate to produce ferrous carbonate, and wherein the mole ratio of alkali metal bicarbonate to ferrous compound is at least 2:1; (b) separating said precipitate from said solution; (c) washing said precipitate, the thus washed precipitate being ferrous carbonate of at least about 98% purity.
Claim 2
Dependent Claim
130 words
A process for making ferrous carbonate, said process being carried out in a sealed vessel, wherein said process comprises: (a) heating a mixture of an alkali metal bicarbonate having the formula XHCO 3 , where X is an alkali metal, and a ferrous compound in solution at a temperature in the range of about 100° C. to about 300° C. for a sufficient time to allow the formation of a precipitate, wherein said ferrous compound is capable of reacting in solution with said alkali metal bicarbonate to produce ferrous carbonate, and wherein the mole ratio of alkali metal bicarbonate to ferrous compound is at least 2:1; (b) separating said precipitate from said solution; (c) washing said precipitate, the thus washed precipitate being ferrous carbonate of at least about 98% purity.
Claim 3
Dependent Claim
29 words
A process as recited in claim 1, wherein the mole ratio of said alkali metal bicarbonate to ferrous compound is in the range of about 3:1 to about 10:1.
Claim 4
Dependent Claim
15 words
A process as recited in claim 1, wherein said ferrous compound is a ferrous salt.
Claim 5
Dependent Claim
14 words
A process as recited in claim 3, wherein said ferrous compound is ferrous chloride.
Claim 6
Dependent Claim
15 words
A process as recited in claim 1, wherein said alkali metal bicarbonate comprises sodium bicarbonate.
Claim 7
Dependent Claim
14 words
A process as recited in claim 1, wherein said solution is an aqueous solution.
Claim 8
Dependent Claim
17 words
A process as recited in claim 6, wherein said process is carried out at about 200° C.
Claim 9
Dependent Claim
14 words
A process as recited in claim 1, wherein said vessel contains an inert gas.
Claim 10
Dependent Claim
17 words
A process as recited in claim 1, wherein in step (c) said precipitate is washed with water.
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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) | 1990-04-13 | 1990-10-13 | 1991-04-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1994-04-13 | 1994-10-13 | 1995-04-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1998-04-13 | 1998-10-13 | 1999-04-14 | $7700.00 | Window Closed / Lapsed |