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Crystallization is a phase transformation process in which crystals are precipitated from a supersaturated solution or formed from other sources. During crystallization, atoms or molecules arrange themselves into a well-defined, rigid crystal lattice to minimize energy.
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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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Membrane Distillation-Crystallization for Sustainable Carbon Utilization and Storage.

Kofi S S Christie1,2, Allyson McGaughey1,3, Samantha A McBride4

  • 1Andlinger Center for Energy and the Environment, Princeton University, Princeton, New Jersey 08544, United States.

Environmental Science & Technology
|October 19, 2023
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Summary

This study introduces membrane distillation-crystallization for producing carbonate minerals from CO2-loaded amine solutions and waste materials. This method offers a sustainable approach for carbon capture and utilization, converting waste into valuable products.

Keywords:
amine solutioncarbon dioxidecarbonate mineralsflue gasmembrane crystallizationscrubbingwastewater

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Area of Science:

  • Environmental Engineering
  • Materials Science
  • Chemical Engineering

Background:

  • Post-combustion carbon dioxide capture is crucial for mitigating greenhouse gas emissions from power plants.
  • Current methods using amine-based solvents face limitations in sustainable carbon dioxide utilization and storage.
  • Developing efficient processes for converting captured CO2 into stable mineral forms is essential.

Purpose of the Study:

  • To investigate membrane distillation-crystallization (MD-crystallization) for controllable carbonate mineral production.
  • To utilize waste materials like fly ash and desalination brines in the carbon mineralization process.
  • To optimize MD-crystallization conditions for enhanced carbon mineralization efficiency and mineral product quality.

Main Methods:

  • Employing membrane distillation-crystallization with varying membrane types and operating conditions.
  • Utilizing CO2-loaded monoethanolamine solutions (30 wt%) with 5-15% CO2 loading.
  • Dosing feed solutions with Ca2+ and Mg2+ (0.18 M) and incorporating waste materials (fly ash, brines).
  • Analyzing the impact of membrane surface energy, roughness, operating temperature, and system configuration on mineralization.

Main Results:

  • Membranes with lower surface energy and higher roughness accelerated mineralization, increasing vapor flux by up to 20%.
  • Lower operating temperatures enhanced membrane wetting tolerance by 96.2% but decreased crystal growth rate by 48.3%.
  • Sweeping gas membrane distillation reduced the mineralization rate by 71.6% while marginally improving wetting tolerance (37.5%).
  • Identified specific mineral identities and growth characteristics resulting from the process.

Conclusions:

  • MD-crystallization offers a viable route for simultaneous carbon dioxide utilization and storage through mineral production.
  • Optimizing membrane properties and operating parameters is key to maximizing mineralization efficiency and product quality.
  • The integration of waste materials presents a sustainable pathway for carbon mineralization, contributing to a circular economy.