Electrochemical separation and concentration of

Paul Scovazzo, Joe Poshusta, Daniel L DuBois, Carl Koval, Richard Noble

Research output: Contribution to journalArticle

31 Citations (Scopus)

Abstract

Low energy separations for 2 gases would benefit gas treatment and CO2 sequestration. Theoretically, electrochemical pumping can separate and concentrate CO2 from the atmosphere or other gases with 2 at significantly lower energy cost than current systems. Principles of electrochemical pumping for CO2 separations are discussed and results for both organic solvent and ionic liquid working fluid systems are presented. Due to the large quantities of gases requiring processing during the separation/concentration of 2 gases, this work looked at solvents with negligible vapor pressures, specifically propylene carbonate and the room-temperature ionic liquid 1-butyl-3-methylimidazolium hexafluorophosphate. Other important parameters, as illustrated by the data and models presented, are low CO2 solubility in the solvent, high CO2 carrier solubility, CO2 binding constants, and the CO2 carrier's electrochemistry. Reported is the electrochemical pumping of CO2 from 0.5% (in nitrogen) to 100%, a 200-fold increase in partial pressure, using the CO2 carrier 2,6-di-tert-butyl-1,4-benzoquinone in a propylene carbonate solution. The ratio of CO2 moles pumped per electron mole was 0.43. The models determined the optimal CO2 solubility in the solvent and the required redox swing in the CO2 binding constants of the carrier.

Original languageEnglish
JournalJournal of the Electrochemical Society
Volume150
Issue number5
DOIs
Publication statusPublished - May 2003

Fingerprint

Gases
Ionic Liquids
gases
pumping
solubility
Solubility
propylene
Ionic liquids
Propylene
Carbonates
carbonates
working fluids
quinones
Electrochemistry
electrochemistry
liquids
Vapor pressure
Partial pressure
Organic solvents
vapor pressure

ASJC Scopus subject areas

  • Electrochemistry
  • Surfaces, Coatings and Films
  • Surfaces and Interfaces

Cite this

Electrochemical separation and concentration of . / Scovazzo, Paul; Poshusta, Joe; DuBois, Daniel L; Koval, Carl; Noble, Richard.

In: Journal of the Electrochemical Society, Vol. 150, No. 5, 05.2003.

Research output: Contribution to journalArticle

Scovazzo, Paul ; Poshusta, Joe ; DuBois, Daniel L ; Koval, Carl ; Noble, Richard. / Electrochemical separation and concentration of . In: Journal of the Electrochemical Society. 2003 ; Vol. 150, No. 5.
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