US4654148A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for the removal of iron cyanide complex or complexes from an aqueous solution
Assignee: Shell USA Inc
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Filing: 1985-12-30
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Granted: 1987-03-31
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Expires: 2005-12-30
Abstract
Abstract A process for removal of iron cyanide complex or complexes from a solution is described, the process being characterized by contact of the solution containing the complex or complexes with ammonium polysulfide or sodium polysulfide, or a mixture thereof, at a temperature of from about 110° C. to about 180° C.
Inventors
- 👤 Daniel C. Baker
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 19:24
CPC Classifications
C; C02; C02F; C02F1/00; C02F1/02; C02F1/025; C02F2101/00; C02F2101/10; C02F2101/16; C02F2101/18; Y; Y10; Y10S; Y10S210/00; Y10S210/902; Y10S210/903; Y10S210/904
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
61 words
A process for the removal of iron cyanide complex or complexes from an aqueous solution comprising heating a solution containing said complex or complexes in a conversion zone with ammonium polysulfide or sodium polysulfide or a mixture thereof, at a temperature of from 110° C. to 180° C., producing a mixture having a reduced concentration of iron cyanide complex or complexes.
Claim 2
Dependent Claim
61 words
A process for the removal of iron cyanide complex or complexes from an aqueous solution comprising heating a solution containing said complex or complexes in a conversion zone with ammonium polysulfide or sodium polysulfide or a mixture thereof, at a temperature of from 110° C. to 180° C., producing a mixture having a reduced concentration of iron cyanide complex or complexes.
Claim 3
Dependent Claim
17 words
The process of claim 1 wherein the solution is at least substantially free of free cyanide species.
Claim 4
Dependent Claim
23 words
The process of claim 1 wherein the ammonium polysulfide, sodium polysulfide, or mixture thereof is supplied to the conversion zone as a solution.
Claim 5
Dependent Claim
66 words
A process for the removal of iron cyanide complex or complexes from an aqueous solution comprising adding ammonium polysulfide or sodium polysulfide, or a mixture thereof, to a solution containing said complex or complexes, and heating the resultant mixture in a conversion zone at a temperature of from 110° C. to 180° C., producing a mixture having a reduced concentration of iron cyanide complex or complexes.
Claim 6
Dependent Claim
66 words
A process for the removal of iron cyanide complex or complexes from an aqueous solution comprising adding ammonium polysulfide or sodium polysulfide, or a mixture thereof, to a solution containing said complex or complexes, and heating the resultant mixture in a conversion zone at a temperature of from 110° C. to 180° C., producing a mixture having a reduced concentration of iron cyanide complex or complexes.
Claim 7
Dependent Claim
17 words
The process of claim 4 wherein the mixture is at least substantially free of free cyanide species.
References Cited (Backward Citations)
US4508683A
Cited
US4505881A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1990-03-30 | 1990-09-29 | 1991-03-31 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1994-03-30 | 1994-09-29 | 1995-03-31 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1998-03-30 | 1998-09-29 | 1999-03-31 | $7700.00 | Window Closed / Lapsed |