Experimental Investigation of the Absorption, Phase Transition, and Desorption Behavior of Biphasic Solvent Blends for Postcombustion CO2 Capture

Qing Ye, Hong Lu, Yang Du, Shihan Zhang, Xinlei Wang, Yongqi Lu

Research output: Contribution to journalConference articlepeer-review

Abstract

Aqueous biphasic solvent blends consisting of diethylenetriamine (DETA) and a tertiary amine, N,N,N',N",N"-pentamethyldiethylenetriamine (PMDETA) or bis[2-(N,N-dimethylamino)ethyl] ether (BDMAEE), were experimentally assessed. Results revealed that the composition of solvent blends greatly affected the CO2 loading capacity and dual-phase transition behavior. A speciation analysis of dual liquid phases suggested that CO2 absorption was a two-stage process, in which CO2 reacted with DETA initially, followed by the protonation of PMDETA or BDMAEE and the production of HCO3-/CO32- species lately. Rates of CO2 absorption and pressures of CO2 desorption were also measured for the selected solvent blends and compared with the benchmark monoethanolamine solvent. Published by Elsevier Ltd.

Original languageEnglish (US)
Pages (from-to)813-822
Number of pages10
JournalEnergy Procedia
Volume114
DOIs
StatePublished - 2017
Event13th International Conference on Greenhouse Gas Control Technologies, GHGT 2016 - Lausanne, Switzerland
Duration: Nov 14 2016Nov 18 2016

Keywords

  • CO capture
  • absorption
  • biphasic solvent
  • desorption
  • phase transition

ASJC Scopus subject areas

  • Energy(all)

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