Alkali Metal Bicarbonate Particle Size Control via Additive Crystallization
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Solution Overview
Problem
Existing methods for producing alkaline bicarbonate particles lack a simple and effective means to control their specific weight by flow and particle size, leading to inefficiencies in packaging and handling due to variations in bulk density and particle size distributions.
Innovation Solution
The process involves crystallizing alkali metal bicarbonate particles from a solution in the presence of specific additives, which modify particle size distribution, shape, and surface electrical charges, allowing for adjustable specific weight and particle size control.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If conventional crystallization methods are used without additives, then the production process is simple, but the control of specific weight by flow and particle size is poor
Solution Approach 1:
The patent applies parameter changes by introducing chemical additives (polymers, surfactants, or their combinations) at controlled concentrations (0.01-1000 ppm) during the crystallization process. These additives modify the crystallization parameters to control particle size distribution and specific weight by flow, transforming an uncontrollable process into one with precise adjustable parameters.
Solution Approach 2:
The patent uses additives as intermediary substances that mediate between the crystallization process and the desired particle properties. These intermediaries (polymers, surfactants) interact with the crystallizing bicarbonate to control nucleation and growth, thereby controlling particle size and flow properties without requiring complex equipment modifications.
2Manufacturing precision
If multiple parameters are adjusted to control specific weight and particle size, then the control precision improves, but the number of adjustment parameters increases
Solution Approach 1:
The patent reduces the number of adjustment parameters by changing the chemical environment through additives rather than adjusting multiple physical parameters (temperature, pressure, agitation). The additive concentration and type become the primary control parameters, simplifying the adjustment process while maintaining high precision control over particle properties.
Solution Approach 2:
The additives serve as intermediaries that consolidate multiple control functions into a single adjustable parameter (additive concentration). Instead of independently controlling nucleation rate, crystal growth rate, and particle aggregation, the additive simultaneously influences all these aspects, reducing the number of independent parameters to adjust.
3Ease of operation
If particle size distribution is narrowed for better handling, then flow properties improve, but the range of applicable applications decreases
Solution Approach 1:
The patent applies dynamics by using adjustable additive concentrations that allow the particle size distribution to be dynamically optimized for different applications. The same crystallization process can produce narrow distributions for improved flow when needed, or broader distributions for other applications, by simply adjusting the additive concentration rather than changing the entire process design.
Solution Approach 2:
The patent enables versatile particle size distributions through parameter changes in additive concentration. By varying the additive level, the process can produce everything from narrow monomodal distributions (optimized for flow) to broader or even bimodal distributions (optimized for other applications), maintaining adaptability while improving ease of operation when needed.
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
This approach enables significant adjustment of specific weight and particle size, improving handling and packaging efficiency by enhancing flow properties and reducing segregation, while maintaining purity at optimal additive concentrations.
Implementation Method 1
The invention relates to a process for the preparation by crystallization of particles of alkali metal bicarbonate from a solution of alkali metal carbonate and/or bicarbonate
Implementation Method 2
allowing either an adjustable and significant increase in the specific weight by flow of the particles obtained, or a reduction in the specific weight. They also make it possible to modulate their particle size, and their spreading or tightening of the particle size distributions
Data Source
Figure 1~2
AI summary
The invention relates to a method for preparing alkali metal bicarbonate particles by crystallisation from an alkali metal carbonate and/or bicarbonate solution with an additive present in the solution, chosen from among sulphates, sulfonates, polysulfonates, amines, hydroysultaines, polycarboxylates, polysaccharides, polyethers and ether-phenols, alkali metal hexametaphosphate, phosphates, sulfosuccinates, amidosulfonates, amine sulfonates, preferably chosen from among polysaccharides, and such that the additive is present in the solution at a concentration of at least 1 ppm and preferably at most 200 ppm.