A Low Cost, High Capacity Regenerable Sorbent for CO2Capture

摘要

TDA is developing a novel sorbent that removes CO2 via physical adsorption from synthesis gas. The relatively strong affinity of the sorbent to CO2 enables effective operation at temperatures up to 300°C (well above the dew point of synthesis gas from commercial gasifiers). However, because the sorbent and the CO2 do not form a true covalent bond, the energy needed to regenerate our sorbent (4.9 kcal per mol of CO2) is much lower than that observed for amine based solvents and chemical absorbents. Our sorbent can be regenerated isothermally and CO2 could be recovered at pressure (-150 psia), reducing the energy needed to compress the CO2 for sequestration. The high surface area and favorable porosity of the sorbent also provides a unique platform to introduce additional functionality such as water-gas-shift (WGS) reaction or trace metal removal. The results from sorbent evaluations and system development will be presented at the meeting.