Electrochemical and Steam-Desorbed Amine CO2 Concentration: Subsystem Comparison

Heppner, D. B.; Schubert, F. H.

doi:10.4271/831120

Cited by 7 publications

References 1 publication

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Advanced regenerative environmental control and life support systems: Air and water regeneration

Schubert

Wynveen

Quattrone

1984

Advances in Space Research

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Extended manned space missions will require regenerative life support techniques. Past U.S. manned missions used nonregenerative expendables, except for a molecular sieve-based carbon dioxide removal system aboard Skylab. The resupply penalties associated with expendables becomes prohibitive as crew size and mission duration increase. The U.S. Space Station. scheduled to be operational in the 1990's, is based on a crew of four to sixteen and a resupply period of 90 days or greater. It will be the first major spacecraft to employ regenerable techniques for life support. The paper uses the requirements for the Space Station to address these techniques.

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Advanced regenerative environmental control and life support systems: Air and water regeneration

Schubert

Wynveen

Quattrone

1984

Advances in Space Research

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Electrochemical Separation and Concentration of <1% Carbon Dioxide from Nitrogen

Scovazzo¹,

Poshusta

DuBois

et al. 2003

J. Electrochem. Soc.

111

131

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Low energy separations for <1% CO2 gases would benefit gas treatment and CO2 sequestration. Theoretically, electrochemical pumping can separate and concentrate CO2 from the atmosphere or other gases with <1% CO2 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 <1% CO2 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. © 2003 The Electrochemical Society. All rights reserved.

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Manned Space Station Environmental Control and Life Support System Computer-Aided Technology Assessment Program

Hall¹,

Pickett²,

Sage³

1984

SAE Technical Paper Series

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Electrochemical and Steam-Desorbed Amine CO2 Concentration: Subsystem Comparison

Cited by 7 publications

References 1 publication

Advanced regenerative environmental control and life support systems: Air and water regeneration

Advanced regenerative environmental control and life support systems: Air and water regeneration

Electrochemical Separation and Concentration of <1% Carbon Dioxide from Nitrogen

Manned Space Station Environmental Control and Life Support System Computer-Aided Technology Assessment Program

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