Performance of hydrophobic physical solvents for pre-combustion CO2 capture at a pilot scale coal gasification facility

Smith, Kathryn H.; Ashkanani, Husain; Thompson, Robert L.; Culp, Jeffrey T.; Hong, Lei; Swanson, Michael; Stanislowski, Joshua; Shi, Wei; Morsi, Badie I.; Resnik, Kevin; Hopkinson, David P.; Siefert, Nicholas S.

doi:10.1016/j.ijggc.2023.103863

Performance of hydrophobic physical solvents for pre-combustion CO₂ capture at a pilot scale coal gasification facility

Journal Article · Mon Feb 27 00:00:00 EST 2023 · International Journal of Greenhouse Gas Control

DOI:https://doi.org/10.1016/j.ijggc.2023.103863· OSTI ID:1983647

Smith, Kathryn H. ^[1]; Ashkanani, Husain ^[2]; Thompson, Robert L. ^[1]; Culp, Jeffrey T. ^[1]; Hong, Lei ^[1]; Swanson, Michael ^[3]; Stanislowski, Joshua ^[3]; Shi, Wei ^[1]; Morsi, Badie I. ^[4]; Resnik, Kevin ^[1]; Hopkinson, David P. ^[1]; Siefert, Nicholas S. ^[1]

National Energy Technology Lab. (NETL), Pittsburgh, PA (United States)
Kuwait University (Kuwait)
Univ. of North Dakota, Grand Forks, ND (United States)
National Energy Technology Lab. (NETL), Pittsburgh, PA (United States); Univ. of Pittsburgh, PA (United States)

Here, in this paper, we present the first pilot plant data for hydrophobic physical solvents for CO₂ and H₂S removal from coal-derived H₂-rich syngas. Four physical solvents were tested under pre-combustion CO₂ capture conditions at bench scale and pilot plant scale: one baseline hydrophilic solvent and three hydrophobic solvents. The solvents were: (1) polyethylene-glycol-dimethyl ether (PEGDME), a hydrophilic solvent analog for the commercial process Selexol, (2) tributyl- phosphate (TBP), a commercially available hydrophobic solvent, (3) polyethylene glycol-poly(dimethylsiloxane) (PEG-PDMS-3), and (4) diethyl sebacate (CASSH-1), a novel, computationally screened hydrophobic solvent developed by the National Energy Technology Laboratory (NETL). All solvents were studied under pure gas (CO₂/N₂/H₂/CH₄) equilibrium conditions at NETL followed by pilot plant testing with syngas at the University of North Dakota Energy & Environmental Research Center (UND EERC). Long term performance of CASSH-1 and PEDGME was then assessed with results compared to process simulation predictions. Within experimental uncertainties, all solvents showed comparable CO₂ absorption performance at above room temperature operation while the hydrophobic solvents had limited water uptake and low vapor pressure, which alleviates concerns related to corrosion, water absorption, and solvent loss to evaporation. These results indicate low viscosity, low vapor pressure hydrophobic solvents are a promising option for lower cost CO₂ capture from high pressure syngas applications.

View Accepted Manuscript (DOE)

Research Organization:: National Energy Technology Laboratory (NETL), Pittsburgh, PA, Morgantown, WV, and Albany, OR (United States)

Sponsoring Organization:: USDOE Office of Fossil Energy (FE)

OSTI ID:: 1983647

Journal Information:: International Journal of Greenhouse Gas Control, Journal Name: International Journal of Greenhouse Gas Control Vol. 124; ISSN 1750-5836

Publisher:: ElsevierCopyright Statement

Country of Publication:: United States

Language:: English

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37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
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Performance of hydrophobic physical solvents for pre-combustion CO2 capture at a pilot scale coal gasification facility

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References (27)

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Performance of hydrophobic physical solvents for pre-combustion CO₂ capture at a pilot scale coal gasification facility