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Method of making inorganic gold compound

a technology of inorganic gold and compound, which is applied in the field of making inorganic gold compound, can solve the problems of high investment cost, large amount of toxic nitrogen oxide generated, and polluted working environment, and achieves high yield, high yield, and safe time-saving

Active Publication Date: 2018-07-26
TRIPOD TECHNOLOGY CORPORATION
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

The present invention provides a method for making various inorganic gold compounds using a halogen-containing oxidizing agent instead of chlorine gas, which is simple, safe, time-effective, cost-effective, and environment-friendly with a high yield. The method does not require precautions for potential hazards or treatments for polluted gases, and can be easily adapted for different inorganic gold compounds.

Problems solved by technology

During this process, a large amount of toxic nitrogen oxides is generated and the working environment is polluted.
In addition, chlorine gas should be stored and operated in sealed equipment to prevent gas leakage, thus causing high cost of investment.
Furthermore, hydrogen peroxide at high concentration, for example, 30 wt % in this reaction, is susceptible to thermal decomposition.
Hence, the above-described conventional methods for production of sodium tetrachloroaurate or potassium tetrachloroaurate are rather complicate, time consuming, and unfavorable for large-scale production.
However, gold (III) chloride is usually prepared by passing chlorine gas over gold powder at 180° C., which is tedious and unfavorable for large-scale production.
Accordingly, the conventional methods for the production of the inorganic gold compound, such as tetrachloroauric acid, sodium tetrachloroaurate, potassium tetrachloroaurate, sodium tetracyanoaurate, and potassium tetracyanoaurate, are complicated, hazardous, time-consuming, costly, and environmentally harmful.

Method used

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  • Method of making inorganic gold compound
  • Method of making inorganic gold compound

Examples

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Effect test

example 1

Synthesis of Sodium Tetrachloroaurate Using Sodium Chlorite in Hydrochloric Acid

[0112]Gold powder (5 g) and concentrated HCl (125 mL of aqueous solution containing 36 wt % of hydrochloric acid) were placed in a 250 mL flat-bottomed flask. 5 mL of aqueous solution containing 5 wt % of sodium chlorite (NaClO2) was added into the flask and a mixture was obtained. The mixture was stirred for 10 min until the gold powder was consumed to obtain a product solution containing sodium tetrachloroaurate. The product solution was concentrated by rotary evaporation at 100° C. under a pressure of 0.5 mbar and stood at room temperature to give crystalline sodium tetrachloroaurate (>99% yield).

example 2

Synthesis of Sodium Tetrachloroaurate Using Sodium Chlorate in Hydrochloric Acid

[0113]Gold powder (0.5 g) and concentrated HCl (25 mL of aqueous solution containing 36 wt % of hydrochloric acid) were placed in a 100 mL flat-bottomed flask. 5 mL of aqueous solution containing 5 wt % of sodium chlorate (NaClO3) was added into the flask and a mixture was obtained. The mixture was stirred for 10 min until the gold powder was consumed to obtain a product solution containing sodium tetrachloroaurate. The product solution was concentrated by rotary evaporation at 100° C. under a pressure of 0.5 mbar and stood at room temperature to give crystalline sodium tetrachloroaurate (>99% yield).

example 3

Synthesis of Tetrachloroauric Acid Using Iodic Acid in Hydrochloric Acid

[0114]Gold powder (0.5 g) and concentrated HCl (25 mL of aqueous solution containing 36 wt % of hydrochloric acid) were placed in a 100 mL flat-bottomed flask. 5 mL of aqueous solution containing 5 wt % of iodic acid (HIO3) was added into the flask and a mixture was obtained. The mixture was stirred for 5 min until the gold powder was consumed to obtain a product solution containing hydrochloric acid. The product solution was concentrated by rotary evaporation at 100° C. under a pressure of 0.5 mbar and stood at room temperature to give crystalline hydrochloric acid (>99% yield).

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Abstract

A method of making the inorganic gold compound, such as tetrachloroauric acid, sodium tetrachloroaurate, potassium tetrachloroaurate, sodium tetracyanoaurate, and potassium tetracyanoaurate, includes the step of: treating gold with a halogen-containing oxidizing agent in a hydrochloric acid to obtain the inorganic gold compound, wherein the halogen-containing oxidizing agent excludes chlorine gas. The method of making the inorganic gold compound is simple, safe, time-effective, cost-effective, and environment-friendly, and has the advantage of high yield.

Description

BACKGROUND1. Technical Field[0001]The present invention relates to a method of making an inorganic gold compound, and more particularly to a method of making an inorganic gold compound applicable in the fields of electronics, biotechnology, and medicines.2. Description of the Prior Art(s)[0002]Inorganic gold compounds including cloroauric acid, also called tetrachloroauric acid (HAuCl4), and gold salts such as sodium tetrachloroaurate (NaAuCl4), potassium tetrachloroaurate (KAuCl4), sodium tetracyanoaurate [NaAu(CN)4], and potassium tetracyanoaurate [KAu(CN)4], are fine chemicals and are widely used in the preparation of various gold-containing catalysts, gold conductive adhesives, and gold colloids (nanoparticles). Tetrachloroauric acid and gold salts are also utilized in chemical plating as the activation solution, in electroplating of gold and gold alloys, in coloring of glass and porcelain, in separation of rubidium, cesium and other elements, and as preservative for biomedicina...

Claims

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Application Information

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IPC IPC(8): C01C3/10C01G7/00
CPCC01G7/00C01C3/10C01G7/006C01P2002/82C01P2002/84C01P2002/88
Inventor LU, LINWANG, CHEN-HSIANGFAN, KUEI-SHENGWANG, CHENG-DINGFANG, JIM-MIN
Owner TRIPOD TECHNOLOGY CORPORATION
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