Spherical Salt Crystals via Controlled Agitation
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Solution Overview
Problem
Current methods fail to efficiently produce spherical sodium chloride crystals in the 100-500 micron size range for industrial and edible applications without using habit modifiers or achieving optimal flow properties.
Innovation Solution
Controlled mechanical stirring and evaporation of saturated brine under specific temperature conditions, enhanced with an anti-solvent to induce multiple nuclei, followed by centrifugation, drying, and sieving to achieve spherical morphology and improved flow characteristics.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If conventional salt crystallization is performed without agitation, then cubic salt crystals are formed, but the flow properties are poor due to sharp edges and irregular shapes
Solution Approach 1:
The patent applies dynamic mechanical agitation during the crystallization process to transform static cubic crystal growth into dynamic spherical crystal formation. The agitation continuously moves and tumbles the crystals during growth, preventing preferential growth along cubic axes and promoting isotropic spherical shapes with smooth surfaces that flow better.
Solution Approach 2:
The patent deliberately promotes spherical crystal morphology through controlled agitation during crystallization. The spherical shape with curved surfaces replaces the sharp-edged cubic form, inherently improving flow properties by reducing inter-particle friction and preventing bridging effects that occur with angular particles.
2Ease of operation
If spherical salt crystals are produced by mechanical means, then flow properties improve, but the crystal surface becomes damaged and morphology is distorted
Solution Approach 1:
The patent performs spherical shaping during the crystal growth phase itself rather than as a subsequent mechanical processing step. By inducing spherical morphology during crystallization through controlled agitation, the crystals develop smooth spherical surfaces inherently, avoiding later mechanical damage that would occur with post-growth tumbling or grinding operations.
Solution Approach 2:
The patent replaces post-crystallization mechanical size reduction and shaping operations with in-situ crystallization control. Instead of growing cubic crystals and then mechanically breaking them into smaller pieces, the process directly grows spherical crystals of the desired size range through controlled nucleation and agitation, eliminating mechanical damage to crystal surfaces.
3Adaptability or versatility
If salt crystals are produced in the 100-500 micron size range, then they are suitable for many applications, but achieving this specific size distribution without habit modifiers is difficult
Solution Approach 1:
The patent controls crystal size distribution in the 100-500 micron range by adjusting crystallization parameters including agitation speed, temperature, and supersaturation level. By optimizing these parameters, the process achieves the desired size distribution for versatile applications without requiring habit modifiers or complex multi-step processing.
Solution Approach 2:
The patent promotes the formation of multiple small nuclei during crystallization through controlled supersaturation and agitation, resulting in numerous small spherical crystals in the 100-500 micron range rather than fewer large crystals. This segmentation approach naturally produces the application-suitable size distribution without additional size reduction steps.
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 process produces spherical salt crystals with enhanced flow properties and reduced caking, achieving a desired size distribution and maintaining surface smoothness, with superior flow characteristics compared to cubic counterparts.
Implementation Method 1
enhanced with an anti-solvent to induce multiple nuclei
Implementation Method 2
Controlled mechanical stirring and evaporation of saturated brine under specific temperature conditions
Implementation Method 3
evaporation of saturated brine under specific temperature conditions
Implementation Method 4
followed by centrifugation, drying, and sieving to achieve spherical morphology
Implementation Method 5
drying, and sieving to achieve spherical morphology and improved flow characteristics
Data Source
AI summary
The present invention provides spherical shaped crystals of common salt having size distribution in the range of 100-500 μm and a process for preparation of the said salt. The above mentioned size range is relevant for many important edible and non-edible applications of salt. The salt is demonstrated to have superior flow properties compared to the cubic counterpart. The free flow property of the salt can be further enhanced through surface treatment with additive such as glycine. The salt is produced by cost-effective mechanical means and such production is amenable to scale up.