Preparation method of barium oxalate hydrate microcrystal with firewood morphology

A technology of hydrated barium oxalate and morphology, applied in carboxylate preparation, organic chemistry, etc., can solve the problems of complex preparation methods and low product quality, and achieve the effects of low preparation cost, high product yield and good dispersibility

Inactive Publication Date: 2014-07-02
BOHAI UNIV
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  • Application Information

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Problems solved by technology

At present, the research on hydrated barium oxalate mainly focuses on its thermal decomposition to form barium oxalate. There are relatively few studies on the morphology-controlled synthesis of hydrated barium oxalate, and the preparation method is complicated and the product quality is not high.

Method used

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  • Preparation method of barium oxalate hydrate microcrystal with firewood morphology
  • Preparation method of barium oxalate hydrate microcrystal with firewood morphology
  • Preparation method of barium oxalate hydrate microcrystal with firewood morphology

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Experimental program
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Effect test

Embodiment 1

[0024] Slowly add the 0.05 mol / L barium chloride solution dropwise to the 0.05 mol / L sodium oxalate solution at room temperature. The amount of the mixed solution added is based on the molar ratio of barium chloride / sodium oxalate = 1:0.5, and the reaction is stirred for 20 minutes at a stirring speed of 70 rpm. The resulting mixed solution was subjected to an aging reaction, the aging reaction temperature was 25 ° C, and the aging reaction time was 12 hours. After the aging reaction, the product obtained by the reaction was filtered and washed, put into an oven, and dried for 4 hours at 40 ° C to obtain a hydrated barium oxalate product.

Embodiment 2

[0026] Slowly add the 0.05 mol / L barium chloride solution dropwise to the 0.05 mol / L sodium oxalate solution at room temperature. The amount of the mixed solution is based on the molar ratio of barium chloride / sodium oxalate = 1:2, and the reaction is stirred for 20 minutes at a stirring speed of 70 rpm. The resulting mixed solution was subjected to an aging reaction, the aging reaction temperature was 25 ° C, and the aging reaction time was 12 hours. After the aging reaction, the product obtained by the reaction was filtered and washed, put into an oven, and dried for 4 hours at 40 ° C to obtain a hydrated barium oxalate product.

Embodiment 3

[0028] Slowly add the 0.05 mol / L barium chloride solution dropwise to the 0.05 mol / L potassium oxalate solution at room temperature. The amount of the mixed solution is based on the molar ratio of barium chloride / potassium oxalate=1:0.5, and the reaction is stirred for 20 minutes at a stirring speed of 90 rpm. The obtained mixed solution was subjected to an aging reaction, the aging reaction temperature was 25 ° C, and the aging reaction time was 8 hours. After the aging reaction, the product obtained by the reaction was filtered and washed, then put into an oven, and dried for 3 hours at 40°C to obtain a hydrated barium oxalate product.

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Abstract

The invention belongs to the field of preparation of inorganic non-metallic materials, and in particular relates to a preparation method of hydrated barium oxalate (BaC2O4·0·5H2O) microcrystals with the appearance of firewood. At 50°C, aging for 2-24 hours, then filtered, washed, and dried to obtain hydrated barium oxalate microcrystals. The soluble divalent barium salt of the present invention is one or a mixture of barium chloride, barium nitrate or barium acetate, and the soluble oxalate is one or a mixture of sodium oxalate, potassium oxalate or ammonium oxalate. The process of the invention is simple and easy, high in purity, low in impurity content, good in dispersibility and low in cost, and the obtained product has a diameter of 1-3 mm and a length of 5-15 mm. The hydrated barium oxalate crystallite with the appearance of firewood prepared by the invention can be widely used in the fields of automobiles, electronics, machinery, chemical industry, construction and the like, and is also an excellent precursor for preparing other barium salt functional materials.

Description

technical field [0001] The invention belongs to the field of preparation of inorganic non-metallic materials, and in particular relates to a preparation method of hydrated barium oxalate crystallite with the appearance of firewood. Background technique [0002] Micro-nano functional materials have become indispensable and important application materials in modern science and technology, and more and more people pay more and more attention to their preparation and performance research. The physicochemical properties of micro / nano functional materials largely depend on their crystalline morphology, microstructure and size. In recent years, controlling the crystallographic morphology and particle size of functional materials at the micro-nano scale has become a very important research field, and materials scientists are increasingly required to propose more effective synthesis reactions and synthesis techniques, formulate Energy-saving, clean and economical synthesis route. T...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C07C55/07C07C51/41
Inventor 许家胜张杰张贺何轶奕邢锦娟刘琳钱建华
Owner BOHAI UNIV
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