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Solution Concentration and Dilution02:59

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The relative amount of a given solution component is known as its concentration. Often, though not always, a solution contains one component with a concentration that is significantly greater than that of all other components. This component is called the solvent and may be viewed as the medium in which the other components are dispersed or dissolved. Solutions in which water is the solvent are, of course, very common on our planet. A solution in which water is the solvent is called an aqueous...
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A solute is a component of a solution that is typically present at a much lower concentration than the solvent. Solute concentrations are often described with qualitative terms such as dilute (of relatively low concentration) and concentrated (of relatively high concentration).
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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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Solids in which the atoms, ions, or molecules are arranged in a definite repeating pattern are known as crystalline solids. Metals and ionic compounds typically form ordered, crystalline solids. A crystalline solid has a precise melting temperature because each atom or molecule of the same type is held in place with the same forces or energy. Amorphous solids or non-crystalline solids (or, sometimes, glasses) which lack an ordered internal structure and are randomly arranged. Substances that...
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Many common substances around us exist as a solution, such as ocean water, air, and gasoline. All solutions are mixtures of substances that are composed of varying amounts of two or more types of atoms or molecules. A mixture with a non-uniform composition is a heterogeneous mixture, whereas a mixture with a uniform composition is a homogeneous mixture. The components that make the homogeneous mixture are evenly spread out and thoroughly mixed. 
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A concentration cell is a type of a  voltaic cell constructed by connecting two almost identical half-cells, both based on the same half-reaction and using the same electrode, differing only in the concentration of one redox species. A concentration cell's potential, therefore, is determined only by the concentration difference of the particular redox species.
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An Alternative Approach to Estimate Solute Concentration: Exploiting the Information Embedded in the Solid Phase.

Stefan Bötschi1, Ashwin Kumar Rajagopalan1, Manfred Morari2

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This study introduces a new method using multiprojection imaging to track solid volume changes for estimating solute concentration during crystallization. This technique offers reliable solute concentration measurements, especially when traditional methods are difficult to apply.

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Area of Science:

  • Chemical Engineering
  • Crystallization Science
  • Process Analytical Technology (PAT)

Background:

  • Traditional methods for estimating solute concentration in crystallization rely on liquid phase properties, which can be challenging in certain scenarios.
  • Accurate online monitoring of solute concentration is crucial for controlling crystallization processes and ensuring product quality.

Purpose of the Study:

  • To present a novel method for the online estimation of solute concentration changes during seeded batch crystallization and crystal dissolution.
  • To validate the proposed method by measuring the solubilities of specific compounds and comparing them with literature data.

Main Methods:

  • The method employs multiprojection imaging to monitor variations in the total solid volume of crystal populations in suspension.
  • Solute concentration is inferred using the principle of mass conservation, linking solid volume changes to solution concentration.
  • The technique was validated by determining the solubilities of beta L-glutamic acid and vanillin in aqueous solutions.

Main Results:

  • The developed method successfully estimated changes in solute concentration during crystallization and dissolution processes.
  • Solubility measurements for beta L-glutamic acid and vanillin using this method showed good agreement with established literature values.
  • The technique demonstrated reliability in estimating solute concentration under conditions where conventional methods are less effective.

Conclusions:

  • Multiprojection imaging offers a viable approach for online solute concentration estimation in crystallization processes.
  • The method provides a promising alternative for monitoring and controlling crystallization, particularly in challenging industrial settings.
  • This technique enhances process understanding and control by enabling real-time solute concentration data acquisition.