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Method for producing titanium hydroxide

A technology of titanium hydroxide and manufacturing method, applied in chemical instruments and methods, titanium oxide/hydroxide, inorganic chemistry, etc., can solve the problem of high manufacturing cost of alkoxide method and achieve the effect of high specific surface area

Inactive Publication Date: 2020-08-25
SAKAI CHEM IND CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0008] It has also been proposed to manufacture by the alkoxide method and maintain about 120m even when heated to 800°C 2 The method of anatase-type titanium oxide containing silica with a BET specific surface area of ​​ / g (refer to Patent Document 2), but because the alkoxide method usually has high production costs, it is difficult to adopt it as a method for industrial production.

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  • Method for producing titanium hydroxide
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  • Method for producing titanium hydroxide

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Embodiment

[0067] Hereinafter, the present invention will be described in detail by listing Examples together with Reference Examples and Comparative Examples. It should be noted that the reference example is an example carried out in order to study the relationship between the conditions of simultaneous neutralization of the titanium tetrachloride aqueous solution and the alkaline substance in the step A and the BET specific surface area and crystallite diameter of the obtained titanium hydroxide. .

[0068] Generally speaking, the composition of titanium hydroxide obtained by neutralizing titanium halide in water with an alkaline substance, or the amount of water and water is uncertain. Therefore, the concentration of the titanium hydroxide in the water slurry is determined based on the weight of such titanium hydroxide, or the phosphorus compound and / or the phosphorus compound to be added to the titanium hydroxide is determined based on the weight of such titanium hydroxide. The prop...

reference example 1

[0071] (Process A)

[0072] will be TiO 2 Titanium tetrachloride aqueous solution with a concentration of 80 g / L and ammonia water with a concentration of 12.5 wt % were heated to 40°C, respectively. In another reaction vessel, 8 L of pure water heated to 40° C. was placed, and the above-mentioned titanium tetrachloride aqueous solution and ammonia water were simultaneously added thereto to carry out a neutralization reaction of titanium tetrachloride to precipitate titanium hydroxide to obtain an aqueous slurry. . The above-mentioned neutralization reaction was performed at a temperature of 50° C. for 4 hours in the range of pH 4.8 to 5.2. After that, the obtained water slurry was further stirred at a temperature of 40°C for 4 hours.

[0073] The water slurry thus obtained was cooled to room temperature, filtered and washed with water to obtain a titanium hydroxide cake. The obtained titanium hydroxide cake was dried at 120° C. for 15 hours to obtain titanium hydroxide po...

reference example 2

[0075] (Process A)

[0076] will be TiO 2 Titanium tetrachloride aqueous solution with a concentration of 80 g / L and ammonia water with a concentration of 12.5 wt % were heated to 40°C, respectively. In another reaction vessel, 8 L of pure water heated to 40° C. was placed, and the above-mentioned titanium tetrachloride aqueous solution and ammonia water were simultaneously added thereto to carry out a neutralization reaction of titanium tetrachloride to precipitate titanium hydroxide to obtain an aqueous slurry. . The said neutralization reaction was performed at the temperature of 40 degreeC in the range of pH 7.8-8.2 for 4 hours. After that, the obtained water slurry was further stirred at a temperature of 40°C for 4 hours.

[0077] The treated water slurry thus obtained was cooled to room temperature, filtered and washed with water to obtain a titanium hydroxide cake. The obtained titanium hydroxide cake was dried at 120° C. for 15 hours to obtain titanium hydroxide po...

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Abstract

According to the present invention, a method for producing titanium hydroxide is provided, which includes: a step A of simultaneously neutralizing an aqueous titanium halide solution and an alkaline substance under the conditions including a pH value of 4.8 to 5.2 and a temperature of 40 to 55 DEG C to produce titanium hydroxide having a BET specific surface area of 300 m<2> / g or more and a crystallite diameter of 20 ampere or more; and a step C of washing the titanium hydroxide with water, then dispersing the washed product in water to produce a slurry containing the titanium hydroxide, thenadding (a) 1.0 to 5.0% by weight of a phosphorus compound or a 2.0 to 5.0% by weight of a silicon compound or (b) a phosphorus compound and a silicon compound in the total amount of 1.0 to 5.0% by weight or less to the slurry, wherein each of the amounts is one relative to the amount of the titanium hydroxide in terms of titanium oxide (TiO<2>) content, to produce a mixed slurry, then washing themixed slurry with water, and then drying the washed product.

Description

technical field [0001] The present invention relates to a method for producing titanium hydroxide, and more specifically, in producing barium titanate, for example, even when heated to 600° C., 90 m can be maintained. 2 A method for producing fine and high-purity titanium hydroxide having a high specific surface area of ​​not less than / g. Background technique [0002] Titanium oxide is widely used as a raw material such as a white pigment and an ultraviolet ray scattering agent. In particular, since fine titanium oxide has a high specific surface area, it is preferably used as a raw material for catalysts, photocatalysts, and electronic materials. [0003] As an electronic material application, titanium oxide is used, for example, as a raw material for producing barium titanate or strontium titanate for multilayer ceramic capacitors (MLCC). In recent years, with the miniaturization of electronic equipment, there is a strong demand for fine MLCCs. In order to obtain such fi...

Claims

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Application Information

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IPC IPC(8): C01G23/04
CPCC01G23/04C01P2004/04C01P2006/12C01P2002/60C01G23/0536C01P2002/52C01P2006/80
Inventor 持田修平松井言永见上胜山本高志渡边伸男
Owner SAKAI CHEM IND CO LTD
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