Basic Zinc Chloride Synthesis via Homogeneous Induction
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Solution Overview
Problem
Existing methods for preparing basic zinc chloride are complex, result in high impurity content, and are costly, making it difficult to meet strict market requirements for particle size and chemical indexes, particularly in the European market.
Innovation Solution
A method involving the preparation of a zinc chloride solution and ammonia water with a controlled molar ratio, pH, and the use of a chlorinated or brominated quaternary ammonium salt as an inducer, followed by parallel flow reaction, filtration, washing, and drying to produce basic zinc chloride with controlled particle size and low impurity content.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If liquid-solid phase heterogeneous reaction is used to prepare basic zinc chloride, then the synthesis can proceed, but the operation process becomes complex and the product quality is difficult to guarantee
Solution Approach 1:
The patent changes the reaction phase from liquid-solid heterogeneous to liquid-liquid homogeneous by using zinc chloride solution instead of solid zinc chloride. This parameter change simplifies the reaction process and improves product quality consistency by eliminating surface adsorption and sandwiching effects that occur in heterogeneous systems.
Solution Approach 2:
The patent introduces an induction system consisting of hydrochloric acid solution with an inducer (quaternary ammonium salt) as an intermediary substance. This intermediary controls the reaction process, prevents premature precipitation, and ensures homogeneous reaction conditions, thereby simplifying operations and improving product quality.
2Productivity
If basic zinc chloride is prepared by conventional methods, then synthesis can occur, but the product has large specific surface area leading to high water content and poor filtering performance
Solution Approach 1:
The patent controls the reaction parameters (temperature, concentration, addition rate) to produce basic zinc chloride particles with optimized size and morphology. This results in smaller specific surface area, lower water content, and improved filtering performance, eliminating the need for complex centrifugal dewatering equipment.
Solution Approach 2:
The patent employs continuous monitoring and control of reaction parameters including pH, temperature, and addition rate. This feedback control ensures consistent particle formation with optimal size distribution, improving filtering performance and reducing the need for complex separation equipment.
3Manufacturing precision
If low concentration zinc chloride solution is used for synthesis, then chemical indexes can be controlled, but the particle size becomes too small and the process is not suitable for industrialization
Solution Approach 1:
The patent uses the induction system (hydrochloric acid solution with quaternary ammonium salt inducer) as a mediator to enable the use of high concentration zinc chloride solution (300-500 g/L) while maintaining good chemical index control. The inducer controls nucleation and growth processes, ensuring acceptable particle size and distribution even at high concentrations, making the process suitable for industrialization.
4Manufacturing precision
If strict control over chemical indexes is implemented, then product quality improves, but the process complexity and cost increase
Solution Approach 1:
The patent performs preliminary purification of zinc chloride solution to remove impurities (Pb, Cd, As, Hg, F) before the main reaction. This preliminary action ensures that strict chemical index control is achieved inherently through the reaction process itself, rather than requiring complex post-processing and quality control equipment.
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 ensures stable product quality, meets stringent chemical index standards, and reduces water content and specific surface area, making the process simpler and more cost-effective for industrialization.
Implementation Method 1
a homogeneous phase synthetic route of using zinc chloride solution and ammonia water... synthesized basic zinc chloride particles
Implementation Method 2
the induction system is hydrochloric acid solution where an inducer is dissolved... the additive amount of the inducer is 0.005%-1.0%
Implementation Method 3
controlling the temperature to be 60.0-90.0° C.... controlling the pH to be 6.5-7.5, and reacting at 60-90° C. for 20-40 min
Implementation Method 4
The reaction mixture is filtered and washed with water to obtain the basic zinc chloride product
Implementation Method 5
drying the basic zinc chloride for 4.0-8.0 hours at 80-105° C. to obtain the basic zinc chloride product
Data Source
AI summary
The present invention relates to a method for preparing basic zinc chloride, comprising the following steps: A: preparing raw materials: preparing zinc chloride solution, ammonia water and an induction system; B: performing synthesis: adding the zinc chloride solution and the ammonia water into the induction system in a parallel flow manner, and controlling the temperature to be 60.0-90.0° C.; after the feeding is finished, continuing to react for 20.0-40.0 minutes; and C: performing filtration, washing and drying: after filtering and washing the synthesized basic zinc chloride, drying the basic zinc chloride for 4.0-8.0 hours at 80-105° C. to obtain the basic zinc chloride product. Compared with the prior art, the method for preparing basic zinc chloride has such advantages as simple process, low impurity content, easy-to-control product quality, and suitability for industrialization.