TDA is developing a novel sorbent that removes CO2 via physical adsorption from synthesis gas, while the relatively strong affinity of the sorbent to CO2 enables effective operation at temperatures up to 300oC (well above the dew point of synthesis gas stream generated by commercial gasifiers).  However, because the sorbent and the CO2 do not form a true covalent bond, the energy needed to regenerate TDA's sorbent (5.4 kcal per mol of CO2) is much lower than that observed for either chemical absorbents (e.g., 29.9 kcal/mol CO2 for sodium carbonate) or amine-based solvents (e.g., 14.2 kcal/mol CO2 for monoethanolamine).  TDA's sorbent can be regenerated isothermally and CO2 could be recovered at pressure (~150 psia).  Thus, the energy needed to regenerate the sorbent and compress the CO2 for sequestration is significantly lower than that for any technology reported to date.  The high surface area and favorable porosity of the sorbent also provides a unique platform to introduce additional functionality, such as active groups to catalyze the water-gas-shift (WGS) reaction or to remove trace metals (e.g., Hg, As). Hence, TDA's CO2 sorbent could be used to capture CO2 in an Integrated Gasification Combined Cycle (IGCC) power plant after the water-gas-shift (WGS) reaction or could also be used in combination with the WGS catalyst to replace the second and/or the third stage WGS. This integrated Water Gas Shift (WGS) catalyst/CO2 sorbent can capture over 90% capture of the CO2 emissions with much lower increase in the cost of electricity (COE) than Selexol based systems.  In this paper we present the results from bench-scale evaluations and the slipstream stream field trials carried out under coal derived synthesis gas.

Novel warm gas CO<sub>2</sub> capture technology for IGCC power plants

245th National Meeting (2013)

The official archive and repository for all ACS Meetings & Expositions abstracts and select posters or presentations.

Novel warm gas CO2 capture technology for IGCC power plants

Novel warm gas CO₂ capture technology for IGCC power plants