Accurate Screening of Candidate Solvents by the Wetted Wall Column Xi Chen, Ross Dugas, Fred Closmann, Shan Zhou, Gary T. Rochelle The University of Texas at Austin 12th MEETING of the INTERNATIONAL POST‐COMBUSTION CO 2 CAPTURE NETWORK Sep 29, 2009 Regina, Canada
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Accurate Screening of Candidate Solvents by the Wetted Wall Column
Xi Chen, Ross Dugas, Fred Closmann, Shan Zhou, Gary T. Rochelley
The University of Texas at Austin
12th MEETING of the INTERNATIONAL POST‐COMBUSTION CO2 CAPTURE NETWORK
Sep 29, 2009p
Regina, Canada
Outline• Background
• Research needs• Research needs• Literature review
• Apparatus• Apparatus• Wetted Wall Column (WWC)
• Results:• Results:• CO2 solubility, CO2 capacity, Heat of absorption• Absorption/Desorption Rates• Absorption/Desorption Rates
• Conclusions
Research Needs• Previous amine capacity & kinetics studies:
– Low amine concentration (< 3 M)
– Zero or very lean CO2 loading
– Narrow temperature range (25~60 oC)
• Typical industrial conditions for CO2 capture
– Absorber: 40‐60 oC
St i 80 120 oC– Stripper: 80‐120 oC
– 12% CO2 in flue gas at 1atm and 90% removal: CO2‐loaded amine solvent (P*CO2 lean=0.5 kPa and P*CO2 rich=5 kPa)amine solvent (P CO2,lean 0.5 kPa and P CO2,rich 5 kPa)
• Previous amine screening efforts
– Simple gas sparging: Absorption rate affected by solution property (density, viscosity & surface tension etc.)
– CO2 capacity for industrial conditions not available
Why WWC for Screening?Why WWC for Screening?
• More representative of commercial packingMore representative of commercial packing than laminar jet or stirred cell.
• More accurate VLE and mass transfer rate in• More accurate VLE and mass transfer rate in loaded solution.
Ad f d i f b b d i• Adequate for design of absorber and stripper.