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A Microfluidic-based Hydrodynamic Trap for Single Particles
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A microfluidic approach for probing hydrodynamic effects in barite scale formation.

Ricardo D Sosa1, Xi Geng, Michael A Reynolds

  • 1Department of Chemical and Biomolecular Engineering, University of Houston, Houston, TX 77204-4004, USA. jrimer@central.uh.edu jcconrad@uh.edu.

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|April 6, 2019
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Summary

This study reveals how flow rate impacts mineral scale formation and dissolution. Microfluidics demonstrate that increasing flow can shift scale control from transport to reaction limits, with optimal conditions found for barite dissolution using diethylenetriaminepentaacetic acid (DTPA).

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Area of Science:

  • Materials Science and Engineering
  • Chemical Engineering
  • Environmental Science

Background:

  • Mineral scale crystallization is a pervasive issue in industrial water treatment, energy production, and manufacturing.
  • The effectiveness of chemical scale inhibitors and dissolvers under dynamic flow conditions is not fully understood.
  • Barite, a highly insoluble mineral, is a significant component of inorganic scale, posing challenges due to its chemical resistance.

Purpose of the Study:

  • To investigate the time-resolved crystallization and dissolution kinetics of barite under varying flow conditions using a microfluidic platform.
  • To elucidate the influence of flow rate and chemical agents on barite scale formation and dissolution mechanisms.
  • To determine optimal conditions for controlling barite scale using diethylenetriaminepentaacetic acid (DTPA).

Main Methods:

  • Development and utilization of a microfluidic platform for controlled experiments.
  • In situ optical microscopy to observe real-time crystallization and dissolution processes.
  • Systematic variation of flow rates, diethylenetriaminepentaacetic acid (DTPA) concentrations, and solution chemistry.

Main Results:

  • In growth environments, increasing flow rate shifted barite crystallization kinetics from transport-limited to reaction-limited regimes.
  • Diethylenetriaminepentaacetic acid (DTPA) addition altered the morphology of barite crystals grown under flow.
  • Enhanced barite dissolution rates were observed with increased flux of DTPA, achieved by higher flow rates or concentrations, indicating optimal parameter combinations.

Conclusions:

  • Microfluidics coupled with optical microscopy provide a powerful platform for studying dynamic crystallization and dissolution phenomena.
  • Flow conditions significantly influence barite scale formation and dissolution, necessitating tailored control strategies.
  • Understanding the interplay between flow dynamics and chemical agents like DTPA is crucial for effective industrial scale management.