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Title: Are Water-lean Solvent Systems Viable for Post-Combustion CO 2 Capture?

Here, we present here an overview of water-lean solvents that compares their projected costs and performance to aqueous amine systems, emphasizing critical areas of study needed to evaluate their performance against their water-based brethren. The work presented her focuses on bridging these knowledge gaps. Because the majority of water-lean solvents are still at the lab scale, substantial studies are still needed to model their performance at scale. This presents a significant challenge as eachformulation has different physical and thermodynamic properties and behavior, and quantifying how these different properties manifest themselves in conventional absorber-stripper configurations, or identifying new configurations that are specific for a solvent’s signature behavior. We identify critical areas of study that are needed, and our efforts (e.g. custom infrastructure, molecular models) to predict, measure, and model these behaviors. Such findings are critical for determining the rheology required for heat exchanger design; absorber designs and packing to accommodate solvents with gradient changes (e.g. viscosity, contact angle, surface tension), and stripper configurations without direct steam utilization or water reflux. Another critical area of research need is to understand the molecular structure of the liquid interface and bulk as a function of CO 2 loading, and to assess whether conventional filmmore » theories accurately quantify solvent behavior, or if thermodynamic models adequately quantify activity coefficients of ions in solution. We conclude with an assessment of our efforts to aid in bridging the knowledge gaps in understanding water-lean solvents, and suggestions of what is needed to enable large-scale demonstrations to meet the United States Department of Energy’s year 2030 goal.« less
Authors:
 [1] ;  [1] ;  [1] ;  [1] ;  [1] ;  [1] ;  [1] ;  [1] ;  [1] ;  [1]
  1. Pacific Northwest National Lab. (PNNL), Richland, WA (United States)
Publication Date:
Report Number(s):
PNNL-SA-121489
Journal ID: ISSN 1876-6102; AA6510000
Grant/Contract Number:
AC05-76RL01830
Type:
Accepted Manuscript
Journal Name:
Energy Procedia
Additional Journal Information:
Journal Volume: 114; Journal Issue: C; Journal ID: ISSN 1876-6102
Publisher:
Elsevier
Research Org:
Pacific Northwest National Lab. (PNNL), Richland, WA (United States)
Sponsoring Org:
USDOE
Country of Publication:
United States
Language:
English
Subject:
15 GEOTHERMAL ENERGY; 54 ENVIRONMENTAL SCIENCES; CO2BOL; water-lean solvent; CO2 capture
OSTI Identifier:
1398182

Heldebrant, David J., Koech, Phillip K., Rousseau, Roger, Glezakou, Vassiliki -Alexandra, Cantu, David, Malhotra, Deepika, Zheng, Feng, Whyatt, Greg, Freeman, Charles J., and Bearden, Mark D.. Are Water-lean Solvent Systems Viable for Post-Combustion CO2 Capture?. United States: N. p., Web. doi:10.1016/j.egypro.2017.03.1218.
Heldebrant, David J., Koech, Phillip K., Rousseau, Roger, Glezakou, Vassiliki -Alexandra, Cantu, David, Malhotra, Deepika, Zheng, Feng, Whyatt, Greg, Freeman, Charles J., & Bearden, Mark D.. Are Water-lean Solvent Systems Viable for Post-Combustion CO2 Capture?. United States. doi:10.1016/j.egypro.2017.03.1218.
Heldebrant, David J., Koech, Phillip K., Rousseau, Roger, Glezakou, Vassiliki -Alexandra, Cantu, David, Malhotra, Deepika, Zheng, Feng, Whyatt, Greg, Freeman, Charles J., and Bearden, Mark D.. 2017. "Are Water-lean Solvent Systems Viable for Post-Combustion CO2 Capture?". United States. doi:10.1016/j.egypro.2017.03.1218. https://www.osti.gov/servlets/purl/1398182.
@article{osti_1398182,
title = {Are Water-lean Solvent Systems Viable for Post-Combustion CO2 Capture?},
author = {Heldebrant, David J. and Koech, Phillip K. and Rousseau, Roger and Glezakou, Vassiliki -Alexandra and Cantu, David and Malhotra, Deepika and Zheng, Feng and Whyatt, Greg and Freeman, Charles J. and Bearden, Mark D.},
abstractNote = {Here, we present here an overview of water-lean solvents that compares their projected costs and performance to aqueous amine systems, emphasizing critical areas of study needed to evaluate their performance against their water-based brethren. The work presented her focuses on bridging these knowledge gaps. Because the majority of water-lean solvents are still at the lab scale, substantial studies are still needed to model their performance at scale. This presents a significant challenge as eachformulation has different physical and thermodynamic properties and behavior, and quantifying how these different properties manifest themselves in conventional absorber-stripper configurations, or identifying new configurations that are specific for a solvent’s signature behavior. We identify critical areas of study that are needed, and our efforts (e.g. custom infrastructure, molecular models) to predict, measure, and model these behaviors. Such findings are critical for determining the rheology required for heat exchanger design; absorber designs and packing to accommodate solvents with gradient changes (e.g. viscosity, contact angle, surface tension), and stripper configurations without direct steam utilization or water reflux. Another critical area of research need is to understand the molecular structure of the liquid interface and bulk as a function of CO2 loading, and to assess whether conventional film theories accurately quantify solvent behavior, or if thermodynamic models adequately quantify activity coefficients of ions in solution. We conclude with an assessment of our efforts to aid in bridging the knowledge gaps in understanding water-lean solvents, and suggestions of what is needed to enable large-scale demonstrations to meet the United States Department of Energy’s year 2030 goal.},
doi = {10.1016/j.egypro.2017.03.1218},
journal = {Energy Procedia},
number = C,
volume = 114,
place = {United States},
year = {2017},
month = {8}
}