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Preparation method of high-purity rhodium triiodide

A rhodium triiodide and high-purity technology is applied in the field of preparation of high-purity rhodium triiodide, which can solve the problems of low yield and low purity, and achieve the effects of uniform crystal grains, high purity and good industrialization prospects.

Pending Publication Date: 2021-01-08
KUNMING BOREN PRECIOUS METALS +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] For this reason, the present invention provides a kind of preparation method of high-purity rhodium triiodide, solves the problem of low yield and low purity in the preparation process of rhodium triiodide in the prior art

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  • Preparation method of high-purity rhodium triiodide

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Embodiment 1

[0024] Such as figure 1 Shown, the preparation method of the high-purity rhodium triiodide provided by the present embodiment comprises the following steps:

[0025] In this embodiment, the trivalent rhodium raw material deionized aqueous solution is dissolved, and the mass concentration of rhodium is controlled to be 15g / L, placed in an ultrasonic field, the addition of hydroiodic acid is 1.05 times of stoichiometric, and the addition rate of hydroiodic acid is 10ml / min , to form a mixed solution, the mixed solution is ultrasonically treated for the first time, and the ultrasonic radiation time is 60min; then an appropriate amount of hydrogen peroxide is added to the mixed solution, wherein the hydrogen peroxide addition is 20% of the mass ratio added by adding hydroiodic acid, and heated to At 65°C, oxidize the residual trace amount of hydriodic acid into volatile elemental iodine. After the iodine volatilizes completely, stop the ultrasonic radiation treatment to obtain a s...

Embodiment 2

[0028] Such as figure 1 Shown, the preparation method of the high-purity rhodium triiodide provided by the present embodiment comprises the following steps:

[0029] In this embodiment, the trivalent rhodium raw material deionized aqueous solution is dissolved, and the mass concentration of rhodium is controlled to be 20g / L, placed in an ultrasonic field, the addition of hydroiodic acid is 1.08 times of stoichiometric, and the addition rate of hydroiodic acid is 15ml / min , to form a mixed solution, the mixed solution is ultrasonically treated for the first time, and the ultrasonic radiation time is 40min; then an appropriate amount of hydrogen peroxide is added to the mixed solution, wherein the hydrogen peroxide addition is 15% of the mass ratio added by adding hydroiodic acid, and heated to At 75°C, oxidize the residual trace amount of hydriodic acid into volatile elemental iodine, stop the ultrasonic radiation treatment after the iodine volatilizes completely, and obtain a ...

Embodiment 3

[0032] Such as figure 1 Shown, the preparation method of the high-purity rhodium triiodide provided by the present embodiment comprises the following steps:

[0033] In this embodiment, the trivalent rhodium raw material deionized aqueous solution is dissolved, and the mass concentration of rhodium is controlled to be 25g / L, placed in an ultrasonic field, the addition of hydroiodic acid is 1.10 times of stoichiometric, and the addition rate of hydroiodic acid is 10ml / min , to form a mixed solution, the mixed solution is ultrasonically treated for the first time, and the ultrasonic radiation time is 60min; then an appropriate amount of hydrogen peroxide is added to the mixed solution, wherein the hydrogen peroxide addition is 25% of the mass ratio added by adding hydroiodic acid, and heated to At 55°C, oxidize the residual trace amount of hydriodic acid into volatile elemental iodine. After the iodine is completely volatilized, stop the ultrasonic radiation treatment to obtain ...

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Abstract

The invention discloses a preparation method of high-purity rhodium triiodide, which comprises the steps of putting a deionized water solution dissolved with a trivalent rhodium-containing raw material into an ultrasonic field, adding a hydroiodic acid solution into the solution to form a mixed solution, and carrying out primary ultrasonic treatment on the mixed solution; and adding hydrogen peroxide into the mixed solution, heating to completely volatilize elemental iodine generated in the reaction, stopping ultrasonic treatment to obtain a rhodium triiodide-containing solution, heating and concentrating the rhodium triiodide-containing solution, and crystallizing to obtain primary rhodium triiodide crystals. According to the preparation method, under ultrasonic radiation, complete reaction of trivalent rhodium and added hydroiodic acid is promoted, and crystal grains are uniform; ultrasonic radiation washing is carried out, impurities in rhodium triiodide crystals can be fully elutedby utilizing the cavitation effect of ultrasonic waves, and the product purity is effectively improved.

Description

technical field [0001] The invention relates to the technical field of chemical preparation, in particular to a method for preparing high-purity rhodium triiodide. Background technique [0002] Rhodium triiodide is a noble metal catalyst, and it is also widely used as a raw material for preparing high-end noble metal catalysts. The current preparation is as follows: Zhang Lei discloses a preparation method of high-purity rhodium triiodide (patent application number: 201310079314.0), that is, rhodium trichloride aqueous solution and hydroiodic acid react under microwave radiation conditions to prepare rhodium triiodide; Microwave radiation heating does not require a heat conduction process, and it is evenly heated, and the mutual contact and collision between molecules increase, and the conversion rate of the reaction product rhodium triiodide is greatly improved. The reaction process is easy to operate, fast and energy-saving; Oxidizing gas is blown into the middle, so that...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01G55/00
CPCC01G55/005
Inventor 范兴祥李琰王家和阿洪忠
Owner KUNMING BOREN PRECIOUS METALS
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