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Preparation method of chloroauric acid

A chloroauric acid and hydrochloric acid technology, applied in the field of chloroauric acid, can solve the problems of polluting the environment, toxic red nitrogen oxide gas, and affecting the purity of the final product, so as to avoid pollution and ensure the purity of the product

Inactive Publication Date: 2016-10-26
TAICANG HUSHI REAGENT
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

There are some shortcomings in the aqua regia method, such as the production of a large amount of red nitrogen oxide poisonous gas during the preparation process, which seriously pollutes the environment
On the other hand, the generated nitrogen oxide gas and unreacted nitric acid are inevitably dissolved in the reaction system, which affects the purity of the final product

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] Put the gold powder in a multi-mouth beaker, heat it to 80°C in a methyl silicone oil bath, add one-fifth of hydrochloric acid, and start stirring. Use a separatory funnel to add dropwise mass fraction of 15wt% hydrogen peroxide (amount of 2.25, taking the gold powder as 1) and remaining hydrochloric acid. The amount of hydrochloric acid is 6 substances, and the gold powder is 1. The mass fraction is 37wt% hydrochloric acid. React 25min to end the reaction.

[0023] After reacting to the complete dissolution of the gold powder, start to evaporate the solution until the red and black sticky pepper (this time the volume of the solution is about the size of the original volume), stop evaporating, cool with cold water and stir, and the orange-yellow chloroauric acid crystals are separated out immediately, and the obtained sample is washed with concentrated sulfuric acid. After drying, store in a desiccator filled with silica gel. This example collects the yield of chloroa...

Embodiment 2

[0025] Put the gold powder in a multi-mouth beaker, heat it to 100°C in a methyl silicone oil bath, add one-fifth of hydrochloric acid, and start stirring. Use a separatory funnel to add dropwise mass fraction of 35wt% hydrogen peroxide (amount of 2.25, based on the amount of gold powder as 1) and remaining hydrochloric acid. The amount of hydrochloric acid is 10 wt. The mass fraction is 30wt% hydrochloric acid. React 5min to end the reaction.

[0026] After reacting to the complete dissolution of the gold powder, start to evaporate the solution until the red and black sticky pepper (this time the volume of the solution is about the size of the original volume), stop evaporating, cool with cold water and stir, and the orange-yellow chloroauric acid crystals are separated out immediately, and the obtained sample is washed with concentrated sulfuric acid. After drying, store in a desiccator filled with silica gel. This example collects the yield of chloroauric acid to be 98.7%...

Embodiment 3

[0028] Put the gold powder in a multi-mouth beaker, heat it to 100°C in a methyl silicone oil bath, add one-fifth of hydrochloric acid, and start stirring. Use a separating funnel to add dropwise mass fraction of 35wt% hydrogen peroxide (amount of 7.5, based on the amount of gold powder as 1) and remaining hydrochloric acid. The amount of hydrochloric acid is 10 wt. The mass fraction is 37wt% hydrochloric acid. React 5min to end the reaction.

[0029] After reacting to the complete dissolution of the gold powder, start to evaporate the solution until the red and black sticky pepper (this time the volume of the solution is about the size of the original volume), stop evaporating, cool with cold water and stir, and the orange-yellow chloroauric acid crystals are separated out immediately, and the obtained sample is washed with concentrated sulfuric acid. After drying, store in a desiccator filled with silica gel. This example collects the yield of chloroauric acid to be 99.6%,...

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PUM

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Abstract

The invention discloses a preparation method of chloroauric acid, including the steps of: performing a reaction to gold powder with a reactant mixture solution composed of hydrochloric acid and hydrogen peroxide, and separating the chloroauric acid from a product mixture solution generated in the reaction. In the preparation method, the gold powder is reacted with the reactant mixture solution composed of the hydrochloric acid and the hydrogen peroxide, wherein the hydrogen peroxide oxidizes the gold powder under an acid condition to generate water and the chloroauric acid, so that influence on purity of the chloroauric acid due to other impurities is avoided and product purity is ensured. In addition, the reaction side product, water, also can avoid environment pollution, so that the method is more environment-friendly.

Description

technical field [0001] The invention relates to the technical field of chloroauric acid, in particular to a preparation method of chloroauric acid. Background technique [0002] Chlorauric acid, which has the molecular formula HAuCl 4 , CAS No.: 16903-35-8. It is orange-yellow crystal, highly deliquescent and soluble in water. Decomposes into gold when heated. The aqueous solution of chloroauric acid contains square planar [AuCl4]-ions, thus many salts containing planar square ions [AuX4]- (X=F, Cl, Br, I, CN, SCN, NO 3 ) can be used for local gold plating of semiconductor and integrated circuit lead frames, gold plating of printed circuit boards, electronic connectors and other electrical contact components. Can also make red glass. As an analytical reagent, it is specially used for the trace analysis of rubidium and cesium and the measurement of alkaloid composition, etc. Also used in photographic materials. Chlorauric acid salts, especially sodium chloroauric acid ...

Claims

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Application Information

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IPC IPC(8): C01G7/00
CPCC01G7/00C01P2006/80
Inventor 王永旗王伟吕明王铮萧瑞雪
Owner TAICANG HUSHI REAGENT