Highly Efficient Removal of CO2 Using Water-Lean KHCO3/Isopropanol Solutions

Lei Wang, Mohammad Saeed, Jianmin Luo, Anna Lee, Rowan Simonet, Zhao Sun, Nigel Walker, Matthew Aro, Richard Davis, Mohammad Abu Zahra, Malek Alkasrawi, Sam Toan

Research output: Contribution to journalArticlepeer-review

Abstract

The use of aqueous carbonate as an inorganic absorbent is not only inexpensive but also stable and environmentally friendly. However, the regeneration processes for aqueous carbonate sorbents require high regeneration heat duty; this energy intensity makes their wide utilization unaffordable. In this work, a low-temperature, energy-saving, and environmentally friendly carbon dioxide desorption method has been investigated in potassium bicarbonate-water-alcohol solutions. The addition of alcohol, particularly isopropanol, to the potassium bicarbonate-water solution can significantly increase carbon dioxide desorption capacity. The potassium bicarbonate-water-isopropanol solution used in this study (36 wt % isopropanol) resulted in 15.2 mmol of carbon dioxide desorption within 2400 s at 80 °C, which was 2000-fold higher than the potassium bicarbonate-water-solution. This research demonstrates a water-lean solvent-based carbon dioxide removal route with the potential to be economical, environmentally safe, and energy-efficient. CO2 sequestration, capture, and utilization technologies will play a key role in reducing CO2 emissions. The excellent desorption kinetics and relatively moderate desorption temperatures (80 °C) of water-lean solvent could help in reducing the cost of CO2 capture, particularly in terms of the heat demand at the regenerator.

Original languageEnglish (US)
Article number1521
JournalAtmosphere
Volume13
Issue number9
DOIs
StatePublished - Sep 2022

Bibliographical note

Funding Information:
The authors gratefully acknowledge Minnesota’s Discovery, Research, and Innovation Economy Program for their financial support of this work.

Publisher Copyright:
© 2022 by the authors.

Keywords

  • CO capture
  • bicarbonate solution
  • desorption
  • isopropanol
  • water-lean

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