Modeling, Design, and Testing of a Novel Biphasic Solvent-Enabled Absorption System for Post-Combustion Carbon Capture

Paul Nielsen, Hafiz Salih, Hong Lu, Qing Ye, Kevin O'Brien, Stephanie Brownstein, Mohamed Attalla, Yongqi Lu

Research output: Contribution to conferencePaperpeer-review

Abstract

A novel absorption process enabled by a new class of biphasic solvents for post-combustion carbon capture (BiCAP) is presently being developed at the University of Illinois at Urbana-Champaign. The new biphasic solvents are water-lean solvent blends that develop dual liquid phases with the absorbed CO2 highly enriched in one of the phases. These solvents are superior in CO2 capacity and have high thermal and oxidative stability compared to MEA. The BiCAP technology features a unique process configuration of multi-stage CO2 absorption and liquid-liquid phase separation during CO2 absorption, allowing continual separation and removal of the CO2-enriched liquid phase for maintaining low solvent viscosity and a fast absorption rate. A 40 kWe-scale skid has recently been constructed at the Abbott Power Plant in Champaign, IL, to test the BiCAP solvent in continuous operation with a slipstream of real post-combustion flue gas. Along with improvements in the stripping configuration including cold feed bypass, the process is expected to achieve a minimum reboiler duty of 2,210 kJ/kg CO2 captured at a stripper operating pressure of 6 bar.

Original languageEnglish (US)
StatePublished - 2021
Externally publishedYes
Event15th Greenhouse Gas Control Technologies Conference, GHGT 2021 - Virtual, Online, United Arab Emirates
Duration: Mar 15 2021Mar 18 2021

Conference

Conference15th Greenhouse Gas Control Technologies Conference, GHGT 2021
Country/TerritoryUnited Arab Emirates
CityVirtual, Online
Period3/15/213/18/21

Keywords

  • Aspen Plus
  • CO capture
  • absorption
  • amine scrubbing
  • biphasic solvent
  • desorption
  • phase transition

ASJC Scopus subject areas

  • General Energy
  • Industrial and Manufacturing Engineering
  • Management, Monitoring, Policy and Law
  • Pollution

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