Disilver Hydrogen Citrate Precipitation for High-Purity Silver Composition
Solution Overview
Problem
Existing methods for producing silver citrate compositions, such as those described in Patent Literatures 1, 2, and 3, suffer from low production efficiency, high costs, and impurity issues, making it difficult to achieve high silver ion concentrations and pure silver citrate solutions.
Innovation Solution
A method involving the preparation of a reaction mixture with a silver compound and citric acid at specific pH levels, followed by precipitation and collection of disilver hydrogen citrate, allowing for the production of a composition with high silver concentration and improved solubility.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If electrolysis method using silver electrodes is used to produce silver dihydrogen citrate solution, then silver citrate solution can be obtained, but production time is extremely long (144 hours) and production cost is high
Solution Approach 1:
The invention changes the chemical parameters by using silver nitrate and citric acid in specific molar ratios (1:1 to 1:2) at controlled temperatures (0-50°C) to directly precipitate disilver hydrogen citrate, avoiding the slow electrolysis process while maintaining high purity through controlled crystallization
Solution Approach 2:
The invention performs preliminary preparation of silver nitrate solution and citric acid solution with precise concentration control before mixing, and uses ice cooling during the reaction to pre-establish optimal crystallization conditions, enabling rapid high-purity product formation without prolonged processing
2Quantity of substance
If trisilver citrate is used as starting material, then silver citrate can be obtained, but solubility is poor (0.0284 g/L at 25°C) and workability deteriorates
Solution Approach 1:
Instead of dissolving poorly soluble trisilver citrate to achieve high silver concentration, the invention inverts the approach by directly precipitating disilver hydrogen citrate from soluble silver nitrate and citric acid solutions, obtaining high silver concentration (36.1-63.1 wt%) in the precipitate form with excellent workability
Solution Approach 2:
The invention changes the chemical composition parameters by targeting disilver hydrogen citrate (Ag2C6H7O7) instead of trisilver citrate (Ag3C6H5O7), achieving superior solubility and workability while maintaining high silver content through controlled precipitation from aqueous solutions
3Quantity of substance
If silver zeolite is dissolved in citric acid solution to produce silver citrate, then silver citrate solution can be obtained, but silica and aluminum impurities are mixed in making purification difficult
Solution Approach 1:
The invention extracts away the problematic zeolite structure by using simple silver nitrate and citric acid as starting materials, eliminating the source of silica and aluminum impurities while directly forming high-purity disilver hydrogen citrate through precipitation
Solution Approach 2:
Instead of using complex zeolite structures that require purification, the invention creates a simplified system using only silver nitrate and citric acid that directly yields the desired silver citrate product without introducing foreign impurities, achieving high purity through simple filtration
4Productivity
If organic antibacterial agents such as triclosan are used, then strong bactericidal properties are achieved in short time, but skin allergy and hormonal disturbance occur
Solution Approach 1:
The invention uses silver ions that naturally decompose into harmless silver metal and citrate ions, replacing persistent organic antibacterial agents with a biodegradable inorganic system that maintains strong bactericidal activity without long-term harmful effects on skin or hormones
Solution Approach 2:
The invention changes from organic chemical compounds (triclosan, zinc pyrithione) to inorganic silver ions, fundamentally altering the chemical nature of the antibacterial agent to achieve both high efficacy and safety by leveraging silver's natural biocidal properties without organic toxin side effects
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 enables the production of a pure disilver hydrogen citrate composition with excellent solubility and wide antibacterial spectrum, suitable for various applications including pharmaceuticals, personal care products, and industrial uses, while reducing production costs and time.
Implementation Method 1
preparing a reaction mixture containing a silver compound and citric acid
Implementation Method 2
precipitating the disilver hydrogen citrate-containing composition from the reaction mixture
Data Source
AI summary
Provided are powder of a pure disilver hydrogen citrate-containing composition in powder form, having excellent solubility, and a method for easily obtaining the disilver hydrogen citrate-containing composition with high efficiency. In addition, provided are an antibacterial agent or antiviral agent, containing the disilver hydrogen citrate-containing composition, and a method for producing the same.The method for producing a disilver hydrogen citrate-containing composition of the present invention includes the following processes (1) to (3):(1) preparing a reaction mixture containing a silver compound and citric acid, the reaction mixture having a pH of 2.0 to 5.5;(2) precipitating the disilver hydrogen citrate-containing composition from the reaction mixture; and(3) collecting the precipitated disilver hydrogen citrate-containing composition.