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Thermodynamics of Aqueous Piperazine/Potassium Carbonate/Carbon Dioxide Characterized by the Electrolyte NRTL Model within Aspen Plus. Topical Report October 1-December 2004.


DE2005838130

Publication Date 2005
Personal Author Hilliard, M.
Page Count 251
Abstract The Electrolyte Nonrandom Two Liquid (NRTL) Activity Coefficient model within Aspen Plus v12.1 was used to develop a rigorous thermodynamic representation of an aqueous piperazine (PZ) and potassium carbonate (K(sub 2)CO(sub 3)) mixed solvent electrolyte system for the application of carbon dioxide (CO(sub 2)) absorption/stripping from power plant flue gas. The model predicts the speciation and carbon dioxide solubility as a function of solvent composition, temperature, and pressure. These results provide the capacity of the solvent, the heat of absorption, and the concentration of reactive species (e.g. piperazine and piperazine carbamate (PZCOO(sup -))). Binary interaction parameters for the potassium carbonate/piperazine mixed solvent electrolyte system were obtained through the regression of water vapor pressure and calorimetry over potassium carbonate and potassium bicarbonate (KHCO(sub 3)) solutions, CO(sub 2) solubility in potassium carbonate/piperazine, and proton nuclear magnetic resonance (NMR) of potassium carbonate/piperazine speciation.
Keywords
  • Carbon dioxide
  • Electrolytes
  • Aqueous solutions
  • Potassium carbonate
  • Piperazines
  • Absorption heat
  • Acid carbonates
  • Flue gas
  • Mixed solvents
  • Fossil-fuel power plants
  • Chemical reaction kinetics
  • Thermodynamic properties
  • Mathematical models
  • Air pollution control
Source Agency
  • Technical Information Center Oak Ridge Tennessee
Corporate Authors Texas Univ. at Austin. Dept. of Chemical Engineering.; Department of Energy, Washington, DC.
Supplemental Notes Sponsored by Department of Energy, Washington, DC.
Document Type Technical Report
NTIS Issue Number 200601
Thermodynamics of Aqueous Piperazine/Potassium Carbonate/Carbon Dioxide Characterized by the Electrolyte NRTL Model within Aspen Plus. Topical Report October 1-December 2004.
Thermodynamics of Aqueous Piperazine/Potassium Carbonate/Carbon Dioxide Characterized by the Electrolyte NRTL Model within Aspen Plus. Topical Report October 1-December 2004.
DE2005838130

  • Carbon dioxide
  • Electrolytes
  • Aqueous solutions
  • Potassium carbonate
  • Piperazines
  • Absorption heat
  • Acid carbonates
  • Flue gas
  • Mixed solvents
  • Fossil-fuel power plants
  • Chemical reaction kinetics
  • Thermodynamic properties
  • Mathematical models
  • Air pollution control
  • Technical Information Center Oak Ridge Tennessee
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