Development of a Conceptual Process for Selective Capture of CO sub(2) from Fuel Gas Streams Using Two TEGO Ionic Liquids as Physical Solvents

Two ionic liquids (ILs), TEGO IL K5 and TEGO IL P51P, were used as physical solvents to develop a conceptual process for CO sub(2) capture from a shifted warm fuel gas stream produced from Pittsburgh no. 8 coal for a 400 MWe power plant. The physical properties of the two ILs and the solubilities of...

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Bibliographic Details
Published in:Industrial & engineering chemistry research 2014-02, Vol.53 (8), p.3184-3195-3184-3195
Main Authors: Basha, Omar M, Heintz, Yannick J, Keller, Murphy J, Luebke, David R, Resnik, Kevin P, Morsi, Badie I
Format: Article
Language:English
Subjects:
Carbon capture and storage
Carbon dioxide
Fuels
Gas streams
Interaction parameters
Ionic liquids
Solubility
Solvents
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Summary:Two ionic liquids (ILs), TEGO IL K5 and TEGO IL P51P, were used as physical solvents to develop a conceptual process for CO sub(2) capture from a shifted warm fuel gas stream produced from Pittsburgh no. 8 coal for a 400 MWe power plant. The physical properties of the two ILs and the solubilities of CO sub(2), H sub(2), N sub(2), and H sub(2)S in the TEGO IL K5 solvent, as well as those of CO sub(2) and H sub(2) in the TEGO IL P51P solvent, were measured in our laboratories at pressures up to 30 bar and temperatures from 300 to 500 K. The Peng-Robinson equation-of-state (P-R EOS) with Boston-Mathias (BM) alpha function and standard mixing rules was used in the development of the process, and the solubility data were used to obtain the binary interaction parameters ( delta sub(ij) and l sub(ij)) between the shifted gas constituents and the two ILs. The binary interaction parameters were then correlated as functions of temperature. The conceptual process consists of four identical adiabatic packed-bed absorbers (4.5 m i.d., 27 m height, packed with 0.0254 m plastic Pall Rings) arranged in parallel for CO sub(2) capture, three flash drums arranged in series for solvent regeneration,and two pressure/intercooling systems for separating and pumping CO sub(2) to sequestration sites. The compositions of all process streams, CO sub(2) capture efficiency, and net power were calculated using Aspen Plus for the two solvents. The results showed that TEGO IL K5 and TEGO IL P51P were able to capture 91.28% and 90.59% of CO sub(2) in the fuel gas stream, respectively.
ISSN:0888-5885
1520-5045
DOI:10.1021/ie403375m