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Integrated continuous flow method with dual feedback-based controls for online analysis and process control.

Naoya Kakiuchi1, Masaki Takeuchi1,2, Hideji Tanaka3,4

  • 1Graduate School of Pharmaceutical Sciences, Tokushima University, 1-78-1 Shomachi, Tokushima, 770-8505, Japan.

Analytical Sciences : the International Journal of the Japan Society for Analytical Chemistry
|October 23, 2022
PubMed
Summary
This summary is machine-generated.

This study introduces an automated continuous flow method with dual feedback controls for precise solution dilution. The system efficiently adjusts flow ratios for accurate concentration control, minimizing waste and supporting sustainable development goals.

Keywords:
Feedback controlFeedback-based flow ratiometryFlow titrationOnline analysisProcess controlSDGs

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Area of Science:

  • Analytical Chemistry
  • Process Engineering
  • Sustainable Chemistry

Background:

  • Accurate solution preparation is crucial in chemical processes.
  • Traditional dilution methods can be inefficient and generate waste.
  • Automated systems offer enhanced precision and throughput.

Purpose of the Study:

  • To present an integrated automated continuous flow method for precise solution dilution.
  • To implement dual feedback controls for online monitoring and process regulation.
  • To verify the system's efficacy in producing solutions of a target concentration.

Main Methods:

  • Utilized a feedback-based flow ratiometry for online process monitoring.
  • Employed a second feedback control for process regulation to achieve preset concentrations.
  • Integrated automated continuous flow with dual feedback loops.
  • Tested the system for diluting acetic acid (CH3COOH) and hydrochloric acid (HCl) solutions.

Main Results:

  • Successfully produced 0.1 mol dm-3 CH3COOH with a relative error below 1.05% within 7.43 minutes, even with varying stock concentrations.
  • Achieved a mean throughput rate of 11.2 titrations min-1.
  • Demonstrated successful results for 0.1 mol dm-3 HCl production.

Conclusions:

  • The developed automated continuous flow method with dual feedback controls enables accurate and efficient solution dilution.
  • The system offers reduced wasteful output and potential for eco-friendly effluent treatment.
  • This technology contributes to Sustainable Development Goals 6, 9, and 14.