US3640745A
Expired / Lapsed
US
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Method of preparing pigmentary titanium dioxide
Assignee: PPG Industries Inc
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Filing: 1969-07-25
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Granted: 1972-02-08
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Expires: 1989-07-25
Abstract
Abstract Agglomerated pigmentary titanium dioxide is prepared by vapor phase oxidation of titanium halide in a reaction chamber at elevated temperatures in the presence of controlled amounts of alkali metal cation and auxiliary gas.
Inventors
- 👤 Donald E Darr
- 👤 G Byron Edwards
- 👤 Clifford E Loehr
- 👤 Elgin E Young
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 03:35
CPC Classifications
C; C09; C09C; C09C1/00; C09C1/36; C09C1/3607; C01; C01G; C01G23/00; C01G23/04; C01G23/047; C01G23/07; C01P; C01P2004/00; C01P2004/50; C01P2004/60; C01P2004/62; C01P2006/00; C01P2006/10; C01P2006/19; C01P2006/60; C01P2006/80
Claims Analysis
Total Claims: 20
Claim 1
Independent Claim
13 words
A process according to claim 1 wherein the titanium halide is titanium tetrachloride.
Claim 2
Dependent Claim
19 words
A process according to claim 1 wherein the pigmentary titanium dioxide has a raw oil absorption of from 20-35.
Claim 3
Dependent Claim
32 words
A process according to claim 1 wherein the pigmentary titanium dioxide has a raw ultimate weight median particle size of from 0.30- 0.35 microns and a raw oil absorption of from 22-26.
Claim 4
Dependent Claim
24 words
A process according to claim 1 wherein the auxiliary gas is recycled reactor discharge gas that has been freed substantially of its TiO2 burden.
Claim 5
Dependent Claim
25 words
A process according to claim 1 wherein from 65- 150 mole percent, based on titanium halide and oxygen, of chemically compatible auxiliary gas is used.
Claim 6
Dependent Claim
20 words
A process according to claim 1 wherein the auxiliary gas has a temperature of from 65* F. to 250* F.
Claim 7
Dependent Claim
19 words
A process according to claim 3 wherein the reaction is conducted in a diffuse reactor under substantially anhydrous conditions.
Claim 8
Dependent Claim
177 words
A process of producing pigmentary titanium dioxide by vapor phase reaction of titanium tetrachloride and oxygen comprising, in combination, the steps of: a. oxidizing titanium tetrachloride in a reaction zone within a diffuse reactor in the presence of additives that provide from 0.1- 10 weight percent co-reacted alumina and from 0.1-10 weight percent co-reacted silica, based on TiO2; b. introducing a source of potassium cation into said reaction zone in amounts which provide from 0.1- 10 parts potassium, per million parts of TiO2; c. introducing from 5- 200 mole percent, based on titanium tetrachloride and oxygen, of chemically compatible auxiliary gas into said reactor, said auxiliary gas having a temperature less than the temperatures prevailing in the reactor; d. regulating the amounts of said potassium cation and said auxiliary gas thus introduced until such amounts, in combination, are sufficient to form agglomerated pigmentary titanium dioxide having a raw oil absorption of at least 20 and a raw ultimate weight median particle size of from 0.20- 0.40 microns; and e. removing such pigmentary titanium dioxide from said reactor.
Claim 9
Dependent Claim
19 words
A process according to claim 9 wherein the pigmentary titanium dioxide has a raw oil absorption of 20- 35.
Claim 10
Dependent Claim
32 words
A process according to claim 9 wherein the pigmentary titanium dioxide has a raw ultimate weight median particle size of from 0.30- 0.35 microns and a raw oil absorption of from 22-26.
Claim 11
Dependent Claim
24 words
A process according to claim 9 wherein less than 5 parts of potassium cation, per million parts of TiO2, is introduced into said reactor.
Claim 12
Dependent Claim
15 words
A process according to claim 9 wherein the auxiliary gas is TiO2-free reactor discharge gas.
Claim 13
Dependent Claim
17 words
A process according to claim 9 wherein the vapor phase reaction is conducted under substantially anhydrous conditions.
Claim 14
Dependent Claim
23 words
A process according to claim 9 wherein from 65- 200 mole percent, based on titanium tetrachloride and oxygen, of auxiliary gas is used.
Claim 15
Dependent Claim
20 words
A process according to claim 9 wherein the auxiliary gas has a temperature of from 65* F. to 250* F.
Claim 16
Dependent Claim
188 words
A process for preparing agglomerated raw pigmentary titanium dioxide by vapor phase reaction of titanium tetrachloride and oxygen comprising, in combination, the steps of: a. oxidizing titanium tetrachloride in a reaction zone within a reactor; b. introducing a source of potassium cation into said reaction zone in amounts which provide from 0.1- 10 parts potassium, per million parts of TiO2; c. introducing from 5- 200 mole percent, based on titanium tetrachloride and oxygen, of chemically compatible auxiliary gas into said reactor, said auxiliary gas having a temperature less than the temperatures prevailing in the reactor; d. regulating the amounts of said potassium cation and said auxiliary gas thus introduced until such amounts, in combination, are sufficient to form agglomerated pigmentary titanium dioxide; e. removing the agglomerated pigmentary titanium dioxide product from the reactor; f. analyzing such titanium dioxide product to determine the oil absorption thereof; and g. adjusting the feed rate of the auxiliary gas in response to said analysis to produce agglomerated pigmentary titanium dioxide having a raw oil absorption of from 20- 35 and a raw ultimate weight median particle size of from 0.20- 0.40 microns.
Claim 17
Dependent Claim
26 words
A process according to claim 17 wherein, in addition, the amount of potassium cation introduced into the reaction zone is adjusted in response to said analysis.
Claim 18
Dependent Claim
24 words
A process according to claim 17 wherein the auxiliary gas is reactor discharge gas having a temperature of from 65* F. to 250* F.
Claim 19
Dependent Claim
35 words
A process according to claim 17 wherein the agglomerated pigmentary titanium dioxide produced has a raw ultimate weight median particle size of from 0.30- 0.35 microns and a raw oil absorption of from 22- 26.
Claim 20
Dependent Claim
21 words
A process according to claim 17 wherein the vapor phase reaction is conducted in a diffuse reactoR under substantially anhydrous conditions.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-02-07 | 1975-08-09 | 1976-02-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-02-07 | 1979-08-09 | 1980-02-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-02-07 | 1983-08-09 | 1984-02-08 | $7700.00 | Window Closed / Lapsed |