Patent US3681895A successfully refreshed from Google Patents.
US3681895A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process and apparatus for recovering metal oxides from hot gases
Assignee: Bayer AG
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Filing: 1971-01-15
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Granted: 1972-08-08
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Expires: 1991-01-15
Abstract
Abstract In the recovery of solids such as titanium oxide from the hot gas in which it is produced by reaction of titanium tetrachloride and oxygen, the gas is first cooled to below about 800* C. by mixing with additional gas, it is further cooled by direct heat exchange with liquid flowing down the walls of a converging zone having a taper angle greater than about 7*, the gas flow rate ranging from about 10 to 100 meters per second, and then making the gas pass through a spray of liquid. The resulting product has the gas removed and partially recycled for initial cooling and a part of the liquid suspension of oxide is recycled as the cooling liquid.
Inventors
- 👤 Hans Zirngibl
- 👤 Klemens Jaschiski
- 👤 Karl Brandle
- 👤 Peter Beumer
- 👤 Walter Weidmann
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 21:01
CPC Classifications
C; C01; C01B; C01B13/00; C01B13/14; C01B13/20; C01B13/22; C01B13/30
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
30 words
A process as claimed in claim 1, wherein cold, dust-free recycled gas is used as rinse in the porous zone and for addition to the reaction gas containing metal oxide.
Claim 2
Dependent Claim
23 words
A process as claimed in claim 1, wherein a uniform rotating film of liquid is present on the walls of the converging zone.
Claim 3
Dependent Claim
25 words
A process as claimed in claim 1, wherein a portion of the final pigment suspension is used as the rinse liquid in the converging zone.
Claim 4
Dependent Claim
15 words
A process as claimed in claim 4, wherein the suspension used is recycled with cooling.
Claim 5
Dependent Claim
21 words
A process as claimed in claim 5, wherein the temperature of the recycled suspension is between about 10* and 90* C.
Claim 6
Dependent Claim
77 words
A process as claimed in claim 6, wherein the metal oxide comprises the oxide of at least one of titanium, silicon, zirconium, iron, zinc, chromium and aluminum, and the gas comPrises chlorine, oxygen and optionally carbon dioxide, wherein cold, dustfree recycled gas is used as rinse in the porous zone and for addition to the reaction gas containing metal oxide, and wherein a uniform rotating film of liquid is present on the walls of the converging zone.
Claim 7
Dependent Claim
126 words
A cooling and washing apparatus adapted to recover metal oxides of the kind formed during the reaction between gaseous metal halides and gases containing oxygen, comprising a. a vessel, b. a pipe for supplying solids-containing gas to said vessel, c. a porous supply tube surrounding said pipe for supplying gas to be mixed with said solids-containing gas, d. means for cooling gas supplied through said porous supply tube, e. said vessel having a converging portion with an angle of taper greater than about 7* located below said porous supply tube, f. means for providing a flowing liquid film on said converging portion, and g. means for producing a spray of liquid below said converging portion through which the solids-containing gas must flow in leaving said vessel.
Claim 8
Dependent Claim
36 words
Apparatus according to claim 8 wherein said means for providing a flowing liquid film includes tangentially directed nozzles whereby said liquid film rotates, and wherein said means for producing a spray of liquid is downwardly directed.
Claim 9
Dependent Claim
52 words
Apparatus according to claim 9, including means for separating the product into gas which is partly recycled to said porous supply tube, and into a suspension of solids in liquid which is partly recycled to said means for providing a flowing liquid film and said means for producing a spray of liquid.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-08-08 | 1976-02-07 | 1976-08-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-08-08 | 1980-02-07 | 1980-08-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-08-08 | 1984-02-07 | 1984-08-08 | $7700.00 | Window Closed / Lapsed |