Electrochemical Synthesis of High-Purity Silver(II) Salts
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Solution Overview
Problem
Current methods for synthesizing silver(II) salts, such as silver(II) sulphate, are plagued by impurities, hazardous reagents, and difficulties in obtaining pure, stable products resistant to water, limiting their applications due to strong oxidizing properties and safety concerns.
Innovation Solution
An electrochemical synthesis method using electrolysis of silver(I) salts in concentrated acid solutions with oxoanions or oxofluoroanions at high anodic potentials, producing silver(II) salts with high purity and stability, including silver(II) sulphate, which can be hydrated without decomposing, and used for modifying organic compounds and treating hazardous wastes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If conventional chemical synthesis methods are used to prepare silver(II) salts, then the synthesis can be performed with simple equipment, but the products contain significant impurities and require complex purification procedures
Solution Approach 1:
The patent replaces conventional chemical synthesis methods with electrochemical synthesis. Instead of using chemical reagents and metathesis reactions, the invention uses electrolysis of silver(I) salt solutions to directly produce high-purity silver(II) salts. This substitution of chemical mechanisms with electrochemical mechanisms eliminates the need for complex purification steps while achieving superior product purity.
Solution Approach 2:
The patent changes the synthesis parameters by controlling electrochemical conditions including applied potential (2.0-3.0 V vs SHE), electrolyte composition (silver(I) salt concentration 0.1-1.0 M), pH (0-2), and temperature (20-80°C). By optimizing these parameters, the method achieves high-purity silver(II) salt production with simpler procedures compared to conventional chemical synthesis.
2Ease of manufacture
If silver(II) salts are prepared by conventional methods, then the synthesis can proceed with standard reagents, but toxic chemicals such as fluorine and hydrogen fluoride are released during decomposition
Solution Approach 1:
The patent converts the harmful oxidizing properties of silver(II) salts into a beneficial feature by using them as the primary oxidizing agent in organic synthesis reactions. Instead of being concerned about the strong oxidizing nature causing safety issues, the invention harnesses this property to enable unique chemical transformations that cannot be achieved with milder oxidants, while the electrochemical preparation method eliminates toxic byproduct formation.
Solution Approach 2:
The patent uses silver(I) salts as intermediaries in the synthesis process. Rather than directly preparing silver(II) salts from elemental silver or other hazardous precursors, the method employs silver(I) salts as stable, non-toxic intermediates that are electrolyzed in situ to generate the desired silver(II) products, thereby eliminating the need to handle toxic chemicals.
3Power
If silver(II) salts are used to modify organic compounds, then powerful oxidation reactions can be achieved, but the strong oxidizing properties create safety concerns and limit applications
Solution Approach 1:
The patent segments the oxidation process into controlled stages by using electrochemical generation of silver(II) ions. Instead of adding pre-formed strong oxidants that pose safety risks, the method generates oxidizing equivalents in situ at the electrode surface, allowing precise control over the oxidation power and timing, thereby reducing safety hazards while maintaining high oxidizing capability.
Solution Approach 2:
The patent employs silver(II) ions as strong oxidants with standard redox potential of about 2.0 V vs SHE, enabling powerful oxidation reactions for modifying organic compounds including alkanes, arenes, and heterocycles. The electrochemical preparation method allows these strong oxidants to be generated on-demand with controlled concentration, achieving high oxidizing power while managing safety through precise parameter control.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The method yields high-purity silver(II) salts and hydrates that are stable in water, reducing operational costs and environmental hazards, enabling their use in organic synthesis and waste treatment without the need for hazardous chemicals, and allows for efficient modification of organic compounds and waste disposal.
Implementation Method 1
The electrolysis of the silver(I) salt or a salt of silver(I) is conducted in the acid solution containing the same anion as electrolyzed salt
Implementation Method 2
Due to the presence of silver atoms in the +2 oxidation state, these compounds have very strong oxidizing properties. The standard redox potential of the Ag(II)/Ag(I) couple is about 2 V versus the standard hydrogen electrode
Implementation Method 3
silver(II) salts resistant to water in various physical states... silver(II) salts and their hydrates
Data Source
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AI summary
The present invention relates to process of the electrochemical synthesis of the silver(ll) salts of high purity, the methods of synthesis of silver(ll) hydrates of high purity, products produced by these methods, and the use of so obtained silver(ll) compounds to modify the molecular structures of organic compounds including waste disposal. A method of electrochemical synthesis of a silver(II) salts with the electrolysis of the silver(l) salts or hydrogensalts of silver(l) in the acid solution containing the same anion as electrolyzed salt, preferably oxoanion or oxofluoroanion with inorganic element in a high degree of oxidation. Use of concentrated acid solution, preferably at a concentration of above 80%. The invention includes silver(II) salts obtained by this method. Process of the synthesis of silver(ll) salts hydrates with expose of silver(II) or silver(I/If) salts to liquid water, ice or water vapour, under strictly controlled conditions. Preferably, the gas solution with a concentration of water vapor 0-100 g/m 3, for 1-200 hours. The invention includes silver(II) salts hydrates obtained by this method. A method of modifying the molecular structures of organic compounds using an oxidising agent is based in on the oxidative initiation of a reagent with a redox compound, using at least one of silver(ll) compound. The invention comprises the use of a silver(ll) salt. The invention comprises the use of a silver(ll) salt as the redox reagent for disposal of hazardous waste and/or toxic substances, particularly organic.