Prof. Gary T. Rochelle

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Prof. Gary T. Rochelle
CPE 5.462, 15 PhD Projects/funding for 1 or
2 Technology Area CO2 Capture from Flue Gas ( to
address Global Climate Change) By Aqueous
Absorption/Stripping Funded by consortium of 24
companies Fundamental Areas Mass Transfer with
Reaction in the Boundary Layer Applied Aqueous
Solution Chemistry Aqueous Thermodynamics Aqueous
Reaction Kinetics/Engineering Crystallization in
Aqueous Solutions Applied Process Simulation
Optimization Mass Transfer in Gas/Liquid
Contactors
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The Present Problem

• Global climate change is happening
• Because of CO2 emissions
• From Coal Combustion

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System for CO2 Sequestration
Disposal Well

Net Power
Power
CaCO
3
CO
2
Coal
Boiler
ESP
FGD
Abs/Str
Flyash
CaSO
4
30 psia Steam
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MEA Absorption/Simple Stripping
CO2
DT10oC
H2O
Rich
Lean
Absorb
Strip
50C
117C
1 atm
2 atm
10 CO2
5 O2
12 H2O
Purge
to
30 MEA
Reclaim
SO2, HCl, NO
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Practical Problems

• Energy 20-30 of power plant output
• Steam for stripping
• CO2 Compression
• Gas pressure drop
• Amine degradation
• 10 of cost
• Environmental impact
• Capital Cost
• 5 x 50 ft diameter absorbers and strippers
• 50 ft packing

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Approaches to Practical Problems

• Better Solvents Such as Piperazine
• Faster CO2 Transfer
• Greater Capacity
• Greater Stability - Oxidation inhibitors
• Better Processes
• - Stripping by Multistage flash
• Solvent Reclaiming
• CaSO4/K2SO4 Precipitation
• Better contacting
• Packing to get G/L area

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Fundamental Lab and Modeling Problems

• Measure Model Thermo with high amine ions
• Measure Model Mass Transfer w Reaction
• Measure/Minimize oxidative thermal degradation
• Develop Methods of Solvent Reclaiming

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Modeling and Pilot Plant Activities

• Develop Integrated Models
• Validate Models with Pilot Plant
• Test and Develop Packing
• Develop Innovative Flowsheets