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Iridium-containing solution, preparation method of iridium hydroxide and application of iridium hydroxide

A technology of iridium hydroxide and solution is applied in the field of preparation of precious metal compounds, can solve the problems of high chlorine content and low iridium yield, etc., and achieves the effect of improving yield and great application prospect

Pending Publication Date: 2022-02-22
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The disadvantage of this method is that repeated precipitation-dissolution makes iridium yield lower, while the chlorine content in the product is still higher

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0078] Weigh 4.659g of chloroiridic acid, add 45.231g of deionized water and 5.002g of absolute ethanol to prepare an aqueous solution containing 3% iridium. The prepared 3% iridium-containing aqueous solution was heated to 70° C., stirred for 30 min, and mixed uniformly to obtain an iridium-containing solution.

[0079] Weigh 5.015g of KOH, dissolve it in 44.889g of deionized water, and prepare a KOH aqueous solution with a mass concentration of 10wt%.

[0080] At 70°C, slowly drop KOH aqueous solution (dropping rate 2mL / min) into the iridium-containing solution, stop the dropwise addition when the pH value is 10, and then stir for 30min under heating. Continue to add KOH aqueous solution dropwise at a rate of 2 mL / min, stop the dropwise addition when the pH value is 10, and stir for 30 minutes under heating. Repeat this again until the pH value of the mixed solution is stable at 10. At this time, a large amount of precipitation appeared in the mixed solution, and the heati...

Embodiment 2

[0084] Weigh 5.463g of iridium chloride, add 81.012g of deionized water and 19.005g of absolute ethanol to prepare an aqueous solution containing 2.8% iridium. The prepared 2.8% iridium-containing aqueous solution was heated to 50° C., stirred for 30 min, and mixed uniformly to obtain an iridium-containing solution.

[0085] Weigh 9.855g KOH, dissolve it in 40.032g deionized water, and prepare a KOH aqueous solution with a mass concentration of 20wt%.

[0086] At 50°C, the KOH aqueous solution was slowly added dropwise (dropping rate 5mL / min) into the iridium-containing solution, and the dropwise addition was stopped when the pH value was 10, and then stirred under heating for 30min. Continue to add KOH aqueous solution dropwise at a rate of 2 mL / min, stop the dropwise addition when the pH value is 10, and stir for 30 minutes under heating. Repeat this again until the pH value of the mixed solution is stable at 10. At this time, a large amount of precipitation appeared in th...

Embodiment 3

[0090] Weigh 31.374g of chloroiridic acid, add 192.509g of deionized water and 10.143g of absolute ethanol, and prepare an aqueous solution containing 5% iridium. The prepared 5% iridium-containing aqueous solution was heated to 80° C., stirred for 30 min, and mixed uniformly to obtain an iridium-containing solution.

[0091] Weigh 10.157g KOH, dissolve it in 176.998g deionized water, and prepare a KOH aqueous solution with a mass concentration of 5wt%.

[0092]At 80°C, slowly drop KOH aqueous solution (dropping rate 8mL / min) into the iridium-containing solution, stop the dropwise addition when the pH value is 10, and then stir for 30min under heating. Continue to add KOH aqueous solution dropwise at a rate of 2 mL / min, stop the dropwise addition when the pH value is 10, and stir for 30 minutes under heating. Repeat this again until the pH value of the mixed solution is stable at 10. At this time, a large amount of precipitation appeared in the mixed solution, and the heatin...

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PUM

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Abstract

The invention relates to an iridium-containing solution, a preparation method of iridium hydroxide and an application of the iridium hydroxide. The invention provides the preparation method for iridium hydroxide; the preparation method comprises the steps of contacting an iridium-containing solution with a precipitant to produce an iridium hydroxide precipitate, wherein the iridium-containing solution comprises a solvent and an iridium-containing compound dissolved in the solvent, and the solvent contains an alcohol compound. By adopting a specific solvent system, the content of chlorine in iridium hydroxide prepared from the iridium-containing solution is low, and the recovery rate of precious metal iridium is high.

Description

technical field [0001] The invention relates to the preparation technology and application field of noble metal compounds, in particular to an iridium-containing solution, a preparation method of iridium hydroxide and an application of iridium hydroxide. Background technique [0002] Iridium compounds are widely used as hydrazine decomposition catalysts, automobile exhaust gas purification catalysts, unsaturated hydrocarbon compound hydrogenation catalysts, and hydroformylation catalysts to prepare aldehydes. More importantly, they are used as carbonylation catalysts to prepare acetic acid / propionic acid. Patent US3772380 discloses a carbonylation reaction using an iridium catalyst, using iridium iodide, carbonyl iodide or other iridium complexes as a catalyst, Br 2 , I 2 or other compounds as accelerators, and carry out methanol carbonylation reaction at a reaction temperature of 50-300° C. and a pressure of 10-1000 psi. [0003] The main raw materials used in the prepara...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01G55/00B01J23/46C07C51/12C07C53/08
CPCC01G55/004C01G55/001B01J23/468C07C51/12C01P2006/80C07C53/08
Inventor 李彤王世亮吕顺丰
Owner CHINA PETROLEUM & CHEM CORP
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