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Related Concept Videos

Optimizing Chromatographic Separations01:15

Optimizing Chromatographic Separations

Optimizing chromatographic separations is crucial for obtaining clean separations in a minimum amount of time. Optimization is required for several factors, including kinetic effects related to band broadening, plate height, capacity factor, and separation factor.
Band broadening refers to spreading solute bands as they travel through the column. This broadening can impact resolution. Plate height (H) represents the length required for one theoretical plate. A lower plate height corresponds to...
High-Performance Liquid Chromatography: Elution Process01:05

High-Performance Liquid Chromatography: Elution Process

In High-Performance Liquid Chromatography (HPLC), the elution process is critical to the separation of analytes and the quality of chromatographic results. Elution describes how compounds move through the column and separate based on their interactions with the mobile and stationary phases. This process determines the resolution, peak shape, and retention times in the chromatogram, which are essential for identifying and quantifying components in complex mixtures. Understanding the elution...
Principles Of Column Chromatography01:13

Principles Of Column Chromatography

The chromatography technique was first invented in 1901 by Michael S. Tswett, a Russian botanist, to separate plant pigments using organic solvents. Further, in 1941, Archer John Porter Martin and R. L. M. Synge modified the technique by packing silica gel into a column. A mixture of amino acids was then separated on the packed column using chloroform and water mixture as the mobile phase. This was the first report on column chromatography. At present, column chromatography is a widely used...
Analyte Adsorption and Distribution01:09

Analyte Adsorption and Distribution

In certain chromatographic separations, solutes transfer between the mobile phase and the stationary phase via sorption, which typically refers to the process of adsorption. For many chromatographic systems, the sorption process often depends on the polarity of the compounds—an expression of the overall dipole moment within the molecule. During the separation process, there is competition between the solute and solvent for adsorption to the stationary phase. Highly polar compounds and solvents...
Column Efficiency: Rate Theory01:12

Column Efficiency: Rate Theory

The rate theory of chromatography provides quantitative insight into the shapes and widths of elution bands. These bands are based on the random-walk mechanism governing molecular migration within a column. The Gaussian profile of chromatographic bands arises from the cumulative effect of random molecular motions as they progress through the column.
During elution, a solute molecule experiences numerous transitions between stationary and mobile phases, exhibiting irregular residence times in...
Chromatographic Methods: Terminology01:18

Chromatographic Methods: Terminology

Chromatography is an analytical technique widely used in fields such as chemistry, biology, environmental science, and pharmaceuticals to separate the components of a mixture and identify substances between them. The process of chromatography is based on the interactions between two distinct phases: the stationary phase and the mobile phase. The stationary phase is fixed in place by a supporting material, while the mobile phase moves over it, carrying the solutes. As the mobile phase travels,...

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Curtain Flow Column: Optimization of Efficiency and Sensitivity
06:44

Curtain Flow Column: Optimization of Efficiency and Sensitivity

Published on: June 12, 2016

Some considerations for optimization of desorption chromatography.

T Gu1, G J Tsai, G T Tsao

  • 1School of Chemical Engineering and Laboratory of Renewable Resources Engineering, A. A. Potter Engineering Center, Purdue University, West Lafayette, Indiana 47907, USA.

Biotechnology and Bioengineering
|January 5, 1991
PubMed
Summary

This study numerically investigated displacer isotherm parameters for desorption chromatography. The optimal displacer is often less strongly adsorbed than the target compounds for efficient separation and concentration.

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Area of Science:

  • Chemical Engineering
  • Separation Science
  • Chromatography

Background:

  • Desorption chromatography is a separation technique.
  • Understanding displacer behavior is crucial for optimizing separation efficiency.
  • Industrial applications require efficient and cost-effective separation methods.

Purpose of the Study:

  • To numerically investigate the impact of displacer isotherm parameters on desorption chromatography efficiency.
  • To identify optimal displacer characteristics for concentrating adsorbates.
  • To analyze industrial applications of desorption chromatography.

Main Methods:

  • Numerical investigation using a general nonlinear multicomponent rate equation model.
  • Incorporation of the Langmuir isotherm to describe adsorption behavior.
  • Analysis of displacer introduction in same or reverse flow directions.

Main Results:

  • The most effective displacer is typically less strongly adsorbed than the target adsorbates.
  • This finding is crucial for displacing and concentrating adsorbates from saturated columns.
  • Minimizing displacer usage is also achieved with less strongly adsorbed displacers.

Conclusions:

  • Desorption chromatography differs significantly from classical displacement development in its operational goals and displacer requirements.
  • The choice of displacer is critical for efficient separation and concentration in desorption chromatography.
  • Numerical modeling provides valuable insights for optimizing industrial desorption chromatography processes.