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

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