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Recrystallization: Solid–Solution Equilibria

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Recrystallization is a purification technique used to separate impurities from solid compounds. In this technique, no chemical reactions occur. Instead, it exploits physical properties only, specifically, the solubility differences between the desired compound and impurities, either at a single temperature or at different temperatures, and under other selected conditions. The solid-solution equilibrium (solubility equilibrium) of each component in the solution represents a binary phase...
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Crystallization is a phase transformation process in which crystals are precipitated from a supersaturated solution or formed from other sources. During crystallization, atoms or molecules arrange themselves into a well-defined, rigid crystal lattice to minimize energy.
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The experimental conditions in a gravimetric analysis should be optimized to maximize the particle size and purity of the obtained precipitate. Ideally, the concentration of the precipitating reagent should be low with effective stirring to maintain low relative supersaturation for the growth of large crystals. In homogeneous precipitation, the precipitant is slowly generated by a chemical reaction in the solution to avoid local reagent excesses. For example, urea decomposes gradually to...
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Imagine adding a small amount of sugar to a glass of water, stirring until all the sugar has dissolved, and then adding a bit more. You can repeat this process until the sugar concentration of the solution reaches its natural limit, a limit determined primarily by the relative strengths of the solute-solute, solute-solvent, and solvent-solvent attractive forces. You can be certain that you have reached this limit because, no matter how long you stir the solution, undissolved sugar remains. The...
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The high insolubility of some precipitates can result in an unfavorable relative supersaturation. This can lead to colloidal particles with a large surface-to-mass ratio, where adsorption is promoted. For instance, in the precipitation of silver chloride, silver ions are adsorbed on the surface of the colloidal particles, forming a primary layer. This layer attracts ions of opposite charge (such as nitrate ions), forming a diffuse secondary layer of adsorbed ions. This electric double layer...
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Precipitate Formation and Particle Size Control01:16

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In precipitation gravimetry, the precipitating agent should react specifically or selectively with the analyte. While a specific reagent reacts with the analyte alone, a selective reagent can react with a limited number of chemical species.
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Updated: Aug 3, 2025

Growing Protein Crystals with Distinct Dimensions Using Automated Crystallization Coupled with In Situ Dynamic Light Scattering
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Separation performance and agglomeration behavior analysis of solution crystallization in food engineering.

Shengzhe Jia1, Xuxing Wan1, Tuo Yao1

  • 1School of Chemical Engineering and Technology, State Key Laboratory of Chemical Engineering, Tianjin University, The Co-Innovation Center of Chemistry and Chemical Engineering of Tianjin, Tianjin 300072, China.

Food Chemistry
|April 8, 2023
PubMed
Summary
This summary is machine-generated.

This study optimized vitamin intermediate crystallization for high purity (>99.5%) and controlled particle size. Temperature and gassing crystallization strategies significantly improved separation efficiency and product properties.

Keywords:
Particle agglomerationProcess IntensificationSeparation efficiencySolution crystallizationVitamin

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Area of Science:

  • Food Engineering
  • Chemical Engineering
  • Crystallization Science

Background:

  • Optimizing intermediate purity is crucial for efficient downstream synthesis.
  • Controlling crystal morphology and particle size distribution impacts product performance and handling.
  • Solution crystallization offers a pathway for precise control over solid-state properties.

Purpose of the Study:

  • To prepare a high-purity vitamin intermediate using solution crystallization.
  • To optimize crystal morphology and particle size distribution.
  • To investigate the quantitative correlations between process variables and product properties.

Main Methods:

  • Solution crystallization technique was employed.
  • Model analysis was used to correlate process variables with outcomes.
  • Temperature cycling and gassing crystallization strategies were implemented for particle size optimization.

Main Results:

  • Product purity exceeded 99.5% under optimal conditions.
  • Higher crystallization temperatures reduced agglomeration and improved particle liquidity.
  • Synergistic control of temperature and gassing crystallization enhanced separation efficiency.

Conclusions:

  • The study successfully produced a high-purity vitamin intermediate.
  • Process intensification through temperature and gassing strategies effectively controlled crystal properties.
  • The findings provide a robust framework for optimizing crystallization processes in food engineering.