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Titanium dioxide powder and method for production thereof

A manufacturing method and technology of titanium oxide, applied in the direction of titanium dioxide, titanium oxide/hydroxide, cosmetic preparations, etc., can solve problems such as difficulty in adoption, complicated procedures, and low rutile conversion rate

Inactive Publication Date: 2006-11-01
TOHO TITANIUM CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] According to the method described in Japanese Patent Application Laid-Open No. 7-291629, although the obtained titanium oxide particles contain rutile crystals, the overall rutile conversion rate is not very high, and further improvement is desired.
In addition, according to the above method, it takes a long time to manufacture, and the process is complicated and the productivity is low, so there is a problem that it is difficult to adopt in actual industrial production.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0041] Titanium oxide powder was produced by a gas phase method in which titanium tetrachloride was brought into contact with oxygen, hydrogen, and water vapor in a gas phase to be oxidized. First, in the gas phase reaction tube with an inner diameter of 400mm having a multi-tube burner on the upper part, the titanium tetrachloride gas preheated to 800°C and vaporized is diluted with nitrogen and supplied to the multi-tube burner. The supply nozzle supplies hydrogen, oxygen and water vapor preheated to 800°C, and the oxidation reaction is carried out at 800°C in the gas phase reaction tube to produce titanium oxide powder. At this time, 500 ml / min of titanium tetrachloride, 20 l / min of oxygen, 20 l / min of hydrogen, and 370 l / min of water vapor were respectively supplied in the standard state. Thereafter, dry air at room temperature was supplied at a rate of 800 l / min to the cooling unit located at the lower part of the gas phase reaction tube to cool the generated titanium oxi...

Embodiment 2

[0062] Titanium oxide powder was produced in the same manner as in Example 1, except that the preheating temperature of titanium tetrachloride gas, hydrogen, oxygen, and water vapor was set at 850°C. Table 2 shows the particle diameter, rutile ratio, specific surface area, impurity content, and particle size distribution of the obtained titanium oxide particles.

Embodiment 3

[0064] Titanium oxide powder was produced in the same manner as in Example 1 except that the preheating temperature of titanium tetrachloride gas, hydrogen gas, oxygen gas, and steam was set at 900°C. Table 2 shows the particle diameter, rutile ratio, specific surface area, impurity content, and particle size distribution of the obtained titanium oxide particles.

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Abstract

A titanium dioxide powder which has a rutile content of 80 % or more and a BET surface area of 30 m<2> / g or more; and a method for producing the titanium dioxide powder wherein a titanium tetrachloride gas, an oxygen gas, a hydrogen gas and steam are reacted in a gas phase, which comprises supplying the above steam in an amount of a chemical equivalent necessary for oxidizing the whole of the titanium tetrachloride gas or more. The above titanium dioxide powder is suitably used as a coating material for a glass substrate and a filler. The above method can be employed for arbitrarily producing a titanium dioxide powder which is composed of fine particles having a great specific surface area and also has a very high rutile content or an anatase type titanium dioxide powder having a high specific surface area.

Description

technical field [0001] The invention relates to a titanium oxide powder with a large specific surface area and a high rutile conversion rate and a manufacturing method thereof, in particular, relates to a titanium oxide powder with a large specific surface area, which can be controlled arbitrarily and its rutile conversion rate can be obtained, and is suitable for use in electronic materials. Production method of titanium oxide powder with high refractive index, ultraviolet shielding material, photocatalyst material, anti-reflection film of display, glass material filler used in base partitions of plasma display, etc., or carrier of various catalysts, etc. . Background technique [0002] Titanium oxide powder has been used as a white pigment since ancient times, and in recent years has been widely used in sintered materials used in electronic materials such as ultraviolet shielding materials such as cosmetics, photocatalysts, capacitors, and thermistors, and raw materials fo...

Claims

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Application Information

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IPC IPC(8): A61K8/19C01G23/07A61K8/29
Inventor 堺英树
Owner TOHO TITANIUM CO LTD