Electronic-Grade Copper Chloride Dihydrate via Dual Separation
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Solution Overview
Problem
Existing methods for preparing copper chloride dihydrate face challenges such as high raw material costs, complex processes, high equipment requirements, and ineffective removal of heavy metal ions, leading to environmental pollution and low process applicability.
Innovation Solution
A two-step solid-liquid separation process using waste PCB board powder and tin chloride compound followed by concentration crystallization to remove water-insoluble substances and trace heavy metal ions, respectively, resulting in a high-purity electronic-grade copper chloride dihydrate.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If chlorine gas is used as reaction agent in the first method, then production efficiency is high and product homogeneity is good, but equipment requirements increase, potential risk increases, process flow becomes long, raw material cost increases, and process applicability decreases
Solution Approach 1:
The patent extracts and removes the hazardous chlorine gas from the reaction system, replacing it with hydrogen peroxide as the oxidizing agent. This eliminates the need for specialized chlorine handling equipment while maintaining the oxidation function, thereby reducing equipment complexity and safety risks while preserving production efficiency.
Solution Approach 2:
The patent converts the harmful chlorine gas into beneficial hydrogen peroxide, which serves as both the oxidizing agent and a green chemical that decomposes into water and oxygen. This transformation maintains the oxidation capability needed for high production efficiency while eliminating the equipment requirements and safety risks associated with chlorine gas handling.
2Manufacturing precision
If activated charcoal is used to remove oils and impurities, then impurity removal is achieved, but cost increases, regeneration becomes difficult, and heavy metal ion impurities cannot be removed
Solution Approach 1:
The patent changes the chemical parameters of the purification system by using hydrogen peroxide oxidation followed by sodium hydroxide precipitation. This chemical parameter change enables the removal of both organic impurities and heavy metal ions simultaneously, achieving high manufacturing precision while using low-cost, readily available chemicals instead of expensive activated charcoal.
Solution Approach 2:
The patent creates a multi-functional purification system where hydrogen peroxide serves as both the primary oxidizing agent for organic impurities and enables subsequent heavy metal removal through pH adjustment and precipitation. This universal approach replaces the single-function activated charcoal with a system that handles multiple impurity types at once, reducing overall cost and complexity.
3Manufacturing precision
If anion exchange resin is used to reduce zinc and iron, then impurity removal is improved, but resin cleaning produces large amount of wastewater, increasing investment costs
Solution Approach 1:
The patent replaces the mechanical/physical anion exchange resin system with a chemical oxidation-precipitation system using hydrogen peroxide and sodium hydroxide. This substitution eliminates the need for resin regeneration and the associated wastewater generation, achieving the same impurity removal precision through chemical reactions that produce minimal harmful waste.
4Manufacturing precision
If copper oxide or copper salt is used as raw material with full dissolution and impurity removal, then product purity is achieved, but raw material requirement becomes high, making impurity limit control unfavorable
Solution Approach 1:
The patent applies preliminary oxidation action using hydrogen peroxide on the copper-containing raw material before dissolution and crystallization. This preliminary treatment converts potential impurities into removable forms early in the process, enabling high product purity to be achieved with less stringent raw material selection and reduced raw material consumption.
Data Source
AI summary
The present disclosure relates to the technical field of preparation of copper chloride, and in particular to a method of preparing an electronic-grade copper chloride dihydrate, which mainly includes the following steps: dissolving a copper salt in a first hydrochloric acid solution to obtain a copper salt solution; performing two solid-liquid separations for the copper salt solution to obtain a filtrate; wherein, the two solid-liquid separations do not have sequence and include an adhesive separation and a co-precipitation separation; the adhesive separation is a solid-liquid separation performed by adding a waste PCB board powder and continuously stirring; the co-precipitation separation is a solid-liquid separation performed by adding tin chloride compound and continuously stirring; adding a second hydrochloric acid into the filtrate and adjusting pH and then performing evaporation concentration to a supersaturated solution, adding copper chloride seed crystal and then performing cooling crystallization and centrifugal separation.