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US4018875A
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Ammonium oxalate process
Assignee: Individual
•
Filing: 1975-03-04
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Granted: 1977-04-19
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Expires: 1995-03-04
Abstract
Abstract A process for the production of ammonium oxalate and a metal carbonate from a metal oxalate and ammonium carbonate in aqueous or methanol media, ideally using excess ammonium hydroxide.
Inventors
- 👤 Robert Kenneth Jordan
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 09:16
CPC Classifications
C; C01; C01G; C01G1/00; C01F; C01F11/00; C01F11/18; C01F11/184; C07; C07C; C07C51/00; C07C51/41; C07C51/412
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
83 words
A process for the production of ammonium oxalate and metal carbonates which are stable under the conditions of the process comprising reacting a metal oxalate with an adduct of carbon dioxide with ammonia or aqueous ammonium hydroxide in a liquid media selected from water, ammonia, methanol, acetone or mixtures thereof at temperatures in the range of -50° C to 300° C under conditions sufficient to retain the liquid media in the liquid state to form an ammonium oxalate and the corresponding metal carbonate.
Claim 2
Dependent Claim
83 words
A process for the production of ammonium oxalate and metal carbonates which are stable under the conditions of the process comprising reacting a metal oxalate with an adduct of carbon dioxide with ammonia or aqueous ammonium hydroxide in a liquid media selected from water, ammonia, methanol, acetone or mixtures thereof at temperatures in the range of -50° C to 300° C under conditions sufficient to retain the liquid media in the liquid state to form an ammonium oxalate and the corresponding metal carbonate.
Claim 3
Dependent Claim
32 words
The process of claim 1 wherein said carbon dioxide adduct with ammonia or ammonium hydroxide is formed in situ by adding carbon dioxide to said liquid media containing ammonia or ammonium hydroxide.
Claim 4
Dependent Claim
11 words
The process of claim 1 wherein said oxalate is calcium oxalate.
Claim 5
Dependent Claim
12 words
The process of claim 1 wherein said calcium oxalate is freshly prepared.
Claim 6
Dependent Claim
9 words
The process of claim 1 which is conducted continuously.
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) | 1980-04-18 | 1980-10-18 | 1981-04-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-04-18 | 1984-10-18 | 1985-04-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-04-18 | 1988-10-18 | 1989-04-19 | $7700.00 | Window Closed / Lapsed |