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Reclaiming method of inorganic iodide

A recovery method, iodide technology, applied in the direction of iodide preparation, alkali metal iodide, chemical instruments and methods, etc., to achieve the effect of high yield

Inactive Publication Date: 2005-11-02
FUJIFILM WAKO PURE CHEM CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Similarly, in the recovery process of iodine, when using, for example, highly toxic chlorine, additional equipment such as a treatment device for excess chlorine is required

Method used

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  • Reclaiming method of inorganic iodide
  • Reclaiming method of inorganic iodide
  • Reclaiming method of inorganic iodide

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0105] Put 104.4g (616.9mmol) of diphenylamine, 62.7g (154.4mmol) of 4,4'-diiodobiphenyl, 42.1g (300mmol) of potassium carbonate, and 0.3g (1.2mmol) of copper sulfate pentahydrate into a four-necked flask , the reaction was carried out at an internal temperature of 235-240°C for 3 hours. After the reaction, the internal temperature was cooled to 100°C, 200 ml of toluene and 57.4 ml of water were added, stirred for 10 minutes, and then left to stand for 10 minutes to separate the organic layer and the water layer. After the two layers were separated, the organic layer was concentrated under reduced pressure to remove the solvent, 245ml of acetone was added, filtered after crystallization, and dried to obtain 67.9g of N,N,N',N'-tetraphenylbenzidine (collected rate 90.0%). The water layer was taken out, and 126 g was obtained as a mixed inorganic salt aqueous solution containing potassium iodide. Then, 252 ml of acetone was added to the obtained water layer, shaken and mixed fo...

Embodiment 2-21

[0107] In Example 1, it carried out by the same method as Example 1 except changing the organic solvent used and its usage-amount. The results are shown in Table 1.

[0108] Example

Embodiment 22

[0110] Put 104.4g (616.9mmol) of diphenylamine, 62.7g (154.4mmol) of 4,4'-diiodobiphenyl, 32.3g (300mmol) of sodium carbonate, and 0.3g (1.2mmol) of copper sulfate pentahydrate into a four-necked flask , the reaction was carried out at an internal temperature of 235-240°C for 5 hours. After the reaction, the internal temperature was cooled to 100°C, 200ml of toluene and 95ml of water were added, stirred for 10 minutes, and left to stand at an internal temperature of 60°C for 10 minutes to separate the organic layer (upper layer) and the aqueous layer (lower layer). The organic layer was concentrated under reduced pressure to remove the solvent, and 245 ml of acetone was added for crystallization. The crystals were separated by filtration and dried to obtain 66.8 g of N,N,N',N'-tetraphenylbenzidine (88.5% yield). On the other hand, the liquid-separated aqueous layer was a mixed inorganic salt solution containing sodium iodide, and its mass was 155 g.

[0111] Then, the above-...

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Abstract

To provide a method for recovering an inorganic iodide, by which the inorganic iodide can be easily recovered in a high concentration from a mixed inorganic salt aqueous solution containing the inorganic iodide without necessitating specific equipment, and to obtain an objective substance at a low cost by recycling the recovered inorganic iodide in an iodine ion-removing reaction.

Description

technical field [0001] The present invention relates to a method for recovering inorganic iodides, in particular to a method for selectively separating and recovering inorganic iodides from a mixed inorganic salt solution containing reaction wastes of inorganic iodides. Furthermore, the present invention relates to a method of reusing the recovered inorganic iodides for the production of iodide compounds as substrates for deiodination reactions. Background technique [0002] Iodine and inorganic iodides are used as important catalysts or starting materials in the field of chemical synthesis. For example, iodo compounds are used as organic photoreceptors of electrophotography and organic electroluminescent elements, intermediates of dyes, agricultural chemicals, pharmaceuticals, etc., and iodine and inorganic iodides are used in the preparation of the iodo compounds. [0003] However, iodine is a valuable natural resource unevenly distributed in production areas and is expen...

Claims

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Application Information

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IPC IPC(8): C02F1/26B01D11/04C01B9/06C01D3/12C07C17/12C07C25/18
Inventor 藤井哲
Owner FUJIFILM WAKO PURE CHEM CORP
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