Fine particulate titanium dioxide, and production process and use thereof

A titanium dioxide and particle technology, applied in titanium dioxide, chemical instruments and methods, titanium oxide/hydroxide, etc., can solve problems such as affecting water or hydroxyl groups, and achieve the effect of reducing production costs

Active Publication Date: 2007-07-25
SHOWA DENKO KK
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The method used for this treatment such as heating or washing with water greatly affects the

Method used

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  • Fine particulate titanium dioxide, and production process and use thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0138] Will use 25Nm 3 Titanium tetrachloride 20 kg / hr diluted with nitrogen gas / hr (N ​​refers to the standard state in which the state is converted to an ideal gas, the same below) was preheated to 1,100° C. and fed into the reaction tube. Similarly, the 55Nm 3 The water vapor per hour was heated to 1,100° C. and supplied into the reaction tube to react with the titanium tetrachloride gas to obtain fine particle titanium dioxide. These particles were collected in a polytetrafluoroethylene bag filter and then fed into an externally heated rotary kiln. The externally heated rotary kiln has a structure in which stirring blades for stirring the powder are assembled inside. The rotary kiln was set to a temperature of 400° C., and the residence time of the powder body was adjusted to about 1 hour by controlling the length of the high temperature zone, the rotation speed and the angle at which the rotary kiln was installed.

[0139] Separately, water vapor in an amount of 20% by...

Embodiment 2

[0146] Will use 25Nm 3 5 kg / hr of titanium tetrachloride diluted with nitrogen gas per hr was preheated to 1,100°C and fed into the reaction tube. Similarly, the 55Nm 3 The water vapor per hour was heated to 1,100° C. and supplied into the reaction tube to react with the titanium tetrachloride gas to obtain fine particle titanium dioxide. These particles were collected by a polytetrafluoroethylene bag filter and then fed into an externally heated rotary kiln. The externally heated rotary kiln has a structure in which stirring blades for stirring the powder are assembled inside. The rotary kiln was set to a temperature of 400° C., and the residence time of the powder body was adjusted to about 1 hour by controlling the length of the high temperature zone, the rotation speed and the angle at which the rotary kiln was installed.

[0147] Separately, water vapor in an amount of 30% by mass based on the mass of titanium dioxide passing through the rotary kiln was fed into the ro...

Embodiment 3

[0154] 150 kg / hr of titanium tetrachloride was preheated to 900°C and fed into the reaction tube. Similarly, the 30Nm 3 The water vapor per hour was heated to 900° C. and fed into the reaction tube to react with the titanium tetrachloride gas to obtain fine particles of titanium dioxide. These particles were collected by a polytetrafluoroethylene bag filter and then fed into an externally heated rotary kiln. The externally heated rotary kiln has a structure in which stirring blades for stirring the powder are assembled inside. The rotary kiln was set to a temperature of 400° C., and the residence time of the powder body was adjusted to about 45 minutes by controlling the length of the high temperature zone, the rotation speed and the angle at which the rotary kiln was installed.

[0155] Separately, water vapor in an amount of 3% by mass based on the mass of titanium dioxide passing through the rotary kiln was fed into the rotary kiln from the outlet of the powder body, wher...

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Abstract

A high-purity ultrafine particulate titanium dioxide with a reduced fluctuation of the absorbed water content whish is a large mass fluctuation factor in a fine particulate powder body, is provided. The fine particulate titanium dioxide has a BET specific surface area of 10 to 200 m2/g, wherein when a powder of the titanium dioxide in an amount of 2 to 5 g is spread in a 10 cm-diameter glass-made Petri dish to a uniform thickness and left standing in an environment at 20oC and a relative humidity of 80% for 5 hours, the rate of change of mass before standing is from -5 mass% to 5 mass%. The process for producing the fine particulate dioxide comprise a first step of high-temperature oxidizing a titanium tetrachloride-containing gas with use of an oxidative gas to produce a titanium dioxide powder, and a second step of contacting water vapor with the titanium dioxide powder while rolling the powder in a heating furnace, thereby effecting dechlorination and at the same time, increasing the absorbed water.

Description

[0001] Cross References to Related Applications [0002] This application is an application filed under 35 U.S.C. §111(a), which requires provisional application No. 60 filed August 19, 2004, under 35 U.S.C. §111(b) under 35 U.S.C. §119(e)(1) / 602,649 Filing Date Benefit. technical field [0003] The present invention relates to particulate titanium dioxide (TiO 2 ) and its preparation method. More specifically, the present invention relates to particulate titanium dioxide obtained by a gas phase method using titanium tetrachloride as a raw material, which can ensure a small mass change rate and is suitable for photocatalysts, solar cells, additives and dielectric materials, and also relates to its preparation method and use . Background technique [0004] Microparticulate titanium dioxide has so far been used in various applications such as UV-shielding materials, additives for silicone rubber, dielectric raw materials, and cosmetic materials. In recent years, applicati...

Claims

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Application Information

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IPC IPC(8): C01G23/00B01J35/00C01G23/07A61K8/29H01G4/12H01G9/20
Inventor 小古井久雄鹿山进田中淳
Owner SHOWA DENKO KK
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