US3607049A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Cooling of pyrogenic titanium dioxide pigment containing gas streams
Assignee: Montedison SpA
•
Filing: 1970-01-22
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Granted: 1971-09-21
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Expires: 1990-01-22
Abstract
Abstract The present invention relates to an improved method for the cooling of pyrogenic titanium dioxide pigment suspended in reaction product gas streams. Broadly, the process involves a gas quench of said suspension followed by indirect heat exchange cooling thereof and treatment of the cooled process gases with water. The pigment is collected from the process gases of the suspension and at least a portion of said process gases are recycled as the gas quench.
Inventors
- 👤 Howard Weaver Jr
- 👤 Robert B Roaper
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 22:22
CPC Classifications
C; C01; C01G; C01G23/00; C01G23/04; C01G23/047; C01G23/07; C01G23/075
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
43 words
The process of claim 1 wherein the amount of water contacted with said reaction zone off-gases represents at least 75 percent of the stoichiometric equivalent for reaction thereof with said total amount of titanium and aluminum halides present in said reaction zone off-gases.
Claim 2
Dependent Claim
35 words
The process of claim 1 wherein said contact of (e) is achieved prior to the separation step of (c) and said separation step is accomplished by filtration of said suspension through a porous filter medium.
Claim 3
Dependent Claim
19 words
The process of claim 1 wherein said contact of (e) is achieved subsequent to the separation step of (c).
Claim 4
Dependent Claim
19 words
The process of claim 1 wherein said water is in vapor form when contacted with said reaction zone off-gases.
Claim 5
Dependent Claim
16 words
The process of claim 1 wherein the titanium tetrahalide converted to titanium dioxide is titanium tetrachloride.
Claim 6
Dependent Claim
21 words
The process of claim 1 wherein the oxidation reaction there is additionally charged to the reaction zone an aluminum halide adjuvant.
References Cited (Backward Citations)
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US2721626A
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US2909409A
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US2990249A
Cited
US3217787A
Cited
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US3493342A
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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) | 1974-09-20 | 1975-03-22 | 1975-09-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-09-20 | 1979-03-22 | 1979-09-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-09-20 | 1983-03-22 | 1983-09-21 | $7700.00 | Window Closed / Lapsed |