US5169619A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of producing titanium oxides
Assignee: Sakai Chemical Industry Co Ltd
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Filing: 1991-02-12
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Granted: 1992-12-08
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Expires: 2011-02-12
Abstract
Abstract There is provided a method of producing titanium oxides which comprises: admixing an aqueous solution of titanium tetrachloride with sulfuric acid in a molar ratio of sulfuric acid to titanium tetrachloride of at least 0.5 adding an alklai to the resultant solution to produce titanium hydroxide; and drying and calcining the titanium hydroxide. A further method is provided which comprises: adding a solution of an alkali to an aqueous solution of titanium tetrachloride having a concentration of not more than 2.5 moles/l at temperatures of not less than 50° C., thereby to substantially thermally hydrolyze the titanium tetrachloride and to produce titanium hydroxide; and drying and calcining the titanium hydroxide.
Inventors
- 👤 Masafumi Yoshimoto
- 👤 Tadao Nakatsuji
- 👤 Kazuhiko Nagano
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 03:25
CPC Classifications
C; C01; C01G; C01G23/00; C01G23/04; C01G23/047; C01G23/053; C01G23/0536; C01P; C01P2006/00; C01P2006/12
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
87 words
A method of producing a denitrizing catalyst which comprises: admixing an aqueous solution of titanium tetrachloride with sulfuric acid in a molar ratio of sulfuric acid to titanium tetrachloride of at least 0.5, to form a further solution; adding an alkali to said further solution to produce titanium hydroxide; drying and calcining the titanium hydroxide at 300°-600° C. to form titanium dioxide having a specific surface area of at least 80.1 m 2 /g when calcined at 500° C.; and supporting thereon tungsten oxides and vanadium oxides.
Claim 2
Independent Claim
87 words
A method of producing a denitrizing catalyst which comprises: admixing an aqueous solution of titanium tetrachloride with sulfuric acid in a molar ratio of sulfuric acid to titanium tetrachloride of at least 0.5, to form a further solution; adding an alkali to said further solution to produce titanium hydroxide; drying and calcining the titanium hydroxide at 300°-600° C. to form titanium dioxide having a specific surface area of at least 80.1 m 2 /g when calcined at 500° C.; and supporting thereon tungsten oxides and vanadium oxides.
Claim 3
Dependent Claim
14 words
The method as claimed in claim 1 wherein the calcining temperature is 500°-600° C.
Claim 4
Independent Claim
81 words
A method of producing a catalyst carrier material which comprises: admixing an aqueous solution of titanium tetrachloride with sulfuric acid in a molar ratio of sulfuric acid to titanium tetrachloride of at least 0.5, to form a further solution; adding an alkali to said further solution to produce titanium hydroxide; and drying and calcining the titanium hydroxide at 300°-600° C. to form titanium dioxide having a specific surface area of at least 80.1 m 2 /g when calcined at 500° C.
Claim 5
Independent Claim
81 words
A method of producing a catalyst carrier material which comprises: admixing an aqueous solution of titanium tetrachloride with sulfuric acid in a molar ratio of sulfuric acid to titanium tetrachloride of at least 0.5, to form a further solution; adding an alkali to said further solution to produce titanium hydroxide; and drying and calcining the titanium hydroxide at 300°-600° C. to form titanium dioxide having a specific surface area of at least 80.1 m 2 /g when calcined at 500° C.
Claim 6
Dependent Claim
14 words
The method as claimed in claim 3 wherein the calcining temperature is 500°-600° C.
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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) | 1995-12-08 | 1996-06-08 | 1996-12-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1999-12-08 | 2000-06-08 | 2000-12-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2003-12-08 | 2004-06-08 | 2004-12-08 | $7700.00 | Window Closed / Lapsed |