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Barium carbonate production method

A manufacturing method and technology of barium carbonate are applied in directions such as barium carbonate, calcium carbonate/strontium/barium, etc. to achieve the effect of less load on the environment

Pending Publication Date: 2020-12-04
SAKAI CHEM IND CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] In recent years, barium carbonate has been required to be further miniaturized for the purpose of thinning / multilayering the dielectric layer when MLCCs are miniaturized and increased in capacity, but there is a limit to the miniaturization by adding citric acid

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0121] After dissolving barium hydroxide octahydrate in pure water, 2.5 mol% citric acid monohydrate salt solution (manufactured by Wako Pure Chemical Industries, Ltd.) and 5 mol% tartaric acid were added to the barium ions in barium hydroxide. Aqueous solution (manufactured by Wako Pure Chemical Industries, Ltd.).

[0122] Next, it was diluted with pure water so that the final concentration of barium hydroxide octahydrate was 72.5 g / L to prepare a barium hydroxide / citric acid / tartaric acid aqueous solution (raw material A). The liquid temperature at this time was adjusted to 32°C. figure 1 In the shown reaction apparatus, the raw material A was charged into the suction port of the pump P1 at a flow rate of 400 ml / min. Simultaneously, the raw material A was injected into the flow path of the pump P1 so that the pH became 6.0 to 7.0, and carbon dioxide gas was blown in at 4.2 L / min to implement the reaction. Such as figure 1 As shown in the reaction apparatus, three connec...

Embodiment 2

[0125] Except having changed 5.0 mol% of tartaric acid in Example 1 into 7.5 mol%, it carried out similarly to Example 1. The results are shown in Table 1. In addition, electron micrographs are shown in image 3 .

Embodiment 3

[0127] In Example 1, it carried out similarly to Example 1 except having changed 2.5 mol% of citric acid into 5.0 mol%, and 5.0 mol% of tartaric acid into 2.5 mol%. The results are shown in Table 1. In addition, electron micrographs are shown in Figure 4 .

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Abstract

The present invention provides a method whereby barium carbonate that is so fine as to exceed a specific surface area of 45 m2 / g can be produced economically and with little burden on the environment.The present invention relates to a barium carbonate production method which is characterized by comprising: a step of adding (a) citric acid and / or a salt thereof to at least one barium compound selected from the group consisting of barium hydroxide, barium chloride, barium nitrate, barium acetate, and barium oxide; a step of reacting (b) carbon dioxide and / or a carbonate compound therewith; anda step of adding (c) at least one among a polybasic carboxylic acid represented by formula (1), an anhydride thereof, or a salt thereof, wherein the percentage by mole A added of (a), the citric and / or the salt thereof, and the percentage by mole B added of (c), the at least one among the polybasic carboxylic acid represented by formula (1), the anhydride thereof, or the salt thereof, with respectto 100% by mole of the barium atoms in the barium compound satisfies the following formulas (I) and (II). HOOC-X-(COOH)n...(1) (In the formula, X represents a divalent or a trivalent linking group; the linking group represents a saturated hydrocarbon group having one or two carbons that may have a hydroxyl group as a substituent, an unsaturated hydrocarbon group having two carbons, or a group derived from a benzene ring; and n represents 1 or 2.) 6.0 <= A+B <= 16...(I) 0.01 <= A / B <= 7.0... (II).

Description

technical field [0001] The invention relates to a method for producing barium carbonate. More specifically, it relates to a method for producing barium carbonate that can be suitably used in various fields including the field of electronic materials. Background technique [0002] High-purity barium carbonate is used in various fields such as optical glass, glaze, ferrite, pigment, dye, and phosphor. Among them, in the field of electronic materials, miniaturized high-purity barium carbonate particles are used for miniaturization and thinning of multilayer ceramic capacitors (MLCC). [0003] As miniaturized high-purity barium carbonate, for example, it is known that the specific surface area is 30m 2 / g~40m 2 / g of barium carbonate, the miniaturization of such barium carbonate is achieved by adding citric acid as a crystal growth inhibitor to the reaction system to suppress particle growth. [0004] In recent years, further miniaturization of barium carbonate has been dema...

Claims

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Application Information

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IPC IPC(8): C01F11/18
CPCC01F11/188C01P2004/04C01P2004/54C01P2006/12C01P2006/80
Inventor 辻田宽西田洋之绪方宏宣
Owner SAKAI CHEM IND CO LTD
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