1. Projects/funding for 1 or 2 Funded by consortium of 24 companies
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

2. The Present Problem Global climate change is happening
Because of CO2 emissions
From Coal Combustion

5. 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

6. MEA Absorption/Simple Stripping
CO2
DT=10oC
H2O
Rich
Lean
Absorb
Strip
50°C
117°C
1 atm
2 atm
Steam
30 psia
10% CO2
5% O2
12% H2O
Purge to
30% MEA
Reclaim
SO2, HCl, NO

7. 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

8. 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

9. 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

10. Modeling and Pilot Plant Activities
Develop Integrated Models
Validate Models with Pilot Plant
Test and Develop Packing
Develop Innovative Flowsheets