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¹³C NMR: ¹H–¹³C Decoupling01:04

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Carbonation is a process used to dissolve carbon dioxide gas in a liquid, commonly used in the production of carbonated beverages. Achieving efficient carbonation requires careful control of temperature, pressure, and flow conditions. By adjusting these parameters, carbonation efficiency can be maximized, producing a higher concentration of CO2 in the liquid.
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Double resonance techniques in Nuclear Magnetic Resonance (NMR) spectroscopy involve the simultaneous application of two different frequencies or radiofrequency pulses to manipulate and observe two distinct nuclear spins. One important application of double resonance is spin decoupling, which selectively suppresses coupling with one type of nucleus while observing the NMR signal from another nucleus, simplifying the spectrum and enhancing resolution.
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Anodic Stripping Voltammetry (ASV), Cathodic Stripping Voltammetry (CSV), and Adsorptive Stripping Voltammetry (AdSV) are electrochemical techniques used to determine trace amounts of analytes in solution. These methods involve applying a potential to an electrode and measuring the resulting current.
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Continuous Stripping with Dense Carbon Dioxide.

Márton Kőrösi1, Petra Kántor1, Péter Bana2

  • 1Department of Chemical and Environmental Process Engineering, Budapest University of Technology and Economics, Műegyetem rakpart 3, Budapest H-1111, Hungary.

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Summary

A new continuous solvent removal process uses dense carbon dioxide to concentrate dilute solutions efficiently. This method achieves up to 40x concentration enhancement for flow chemistry applications.

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Area of Science:

  • Chemical Engineering
  • Process Chemistry

Background:

  • Continuous manufacturing and flow chemistry require scalable methods for concentrating dilute solutions.
  • Existing concentration techniques, like thermal methods, can be inefficient or unsuitable for small-scale continuous processes.

Purpose of the Study:

  • To present the design and application of a novel continuous solvent removal process.
  • To demonstrate an efficient and controllable method for concentrating dilute solutions in flow chemistry.

Main Methods:

  • A continuous stripping method utilizing dense carbon dioxide (CO2) to form homogeneous mixtures with dilute organic solutions.
  • Controlled reduction of pressure to induce CO2 release and solvent vaporization.
  • Optimization of parameters including CO2 to feed mass-flow rate ratio and phase separator temperature.

Main Results:

  • Achieved solute concentration enhancement of up to 40 times in the liquid phase.
  • Demonstrated accurate control over the degree of concentration by adjusting operational parameters.
  • The process operates effectively at low temperatures (35 °C) and moderate pressures (10 MPa).

Conclusions:

  • The developed continuous solvent removal process is an efficient and controllable alternative to traditional thermal concentration methods.
  • The apparatus, built with laboratory equipment, is suitable for supporting pilot-scale synthetic flow chemistry.
  • This method offers a scalable solution for concentrating solutions in continuous manufacturing settings.