US3683590A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Dual flue condenser
Assignee: WENDELL E DUNN JR
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Filing: 1971-04-29
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Granted: 1972-08-15
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Expires: 1991-04-29
Abstract
Abstract Claimed is a process for condensing iron chlorides from a gaseous stream in two-steps, the first step being the cooling of the gases to about 675* C. to condense ferrous chloride as a liquid and leaving a gas ferrous residual and then in the second step adding chlorine gas and sodium chloride salt separately wherein the remaining FeCl2 is oxidized to FeCl3 which with the initial FeCl3 is converted to NaFeCl4 and cooling that product to a temperature above 159*C. This process is useful for recovering iron chlorides from a gaseous effluent to minimize air pollution.
Inventors
- 👤 Wendell E Dunn Jr
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 21:04
CPC Classifications
C; C01; C01G; C01G49/00; C01G49/10; B; B01; B01D; B01D53/00; B01D53/34; B01D53/46; B01D53/68
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
88 words
A process for recovering iron chlorides from a gas stream having a temperature above 980* C comprising passing said gas stream through an externally cooled first flue to reduce the temperature of the gas stream to 675*-900* C, collecting liquid ferrous chloride from said first flue and then cooling the residue of the gas stream in a second externally cooled flue while contacting said gas stream with chlorine to oxidize residual to chloride in the gas stream and adding sodium chloride ro form a sodium chloride-ferric chloride complex.
Claim 2
Dependent Claim
70 words
A process for removing iron chlorides from a gas stream containing other gases in addition to ferrous chloride when said gas stream is at a temperature above 980* C comprising initially cooling said gas stream to a temperature between 980* C and 675* C, removing liquid ferrous chloride and then further cooling said gas stream while contacting it with chlorine and sodium chloride or a sodium chloride-ferric chloride complex salt.
Claim 3
Dependent Claim
46 words
A process for condensing iron chlorides from a mixed gas stream at 980* - 1100* C comprising first cooling the gas stream to 675* - 900* C, adding chlorine and sodium chloride or a sodium chloride-ferric chloride complex salt and cooling to 675* - 185* C.
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) | 1975-08-15 | 1976-02-14 | 1976-08-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-08-15 | 1980-02-14 | 1980-08-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-08-15 | 1984-02-14 | 1984-08-15 | $7700.00 | Window Closed / Lapsed |