A model of vapor-liquid equilibria in acid gas: Aqueous alkanolamine systems using the electrolyte-NRTL equation

Conference · Fri Jan 01 04:00:00 EST 1988

OSTI ID:5695486

Austgen, D M; Rochelle, G T ^[1]; Chen, C C ^[2]

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1. Univ. of Texas at Austin, TX (US)
2. Aspen Technology, Inc. TX (US)

In this paper a thermodynamically-consistent model is developed for representing vapor-liquid equilibria in the acid gas (H/sub 2/S, CO/sub 2/)-alkanolamine-water system. The model accounts for chemical equilibria in a rigorous manner. Activity coefficients are represented with the Electrolyte-NRTL equation, treating both long-range ion-ion interactions and short-range interactions between all true liquid phase species. Both water and alkanolamine are treated as solvents. Adjustable parameters of the Electrolyte-NRTL equation, representing short-range binary interactions, are fitted primarily on binary and ternary system VLE data. Calculated vapor pressures of H/sub 2/S or CO/sub 2/ over aqueous solutions of monoethanolamine or diethanolamine generally agree with published experimental data within 10 percent over the temperature range 25-120{sup 0}C. No more than two additional parameters are adjusted on quartenary system VLE data to provide a good representation of H/sub 2/S and CO/sub 2/ vapor pressures over the same alkanolamine solutions.

• OSTI ID: 5695486
• Report Number(s): CONF-880348--
• Country of Publication: United States
• Language: English

Related Subjects

03 NATURAL GAS
033000* -- Natural Gas-- Properties & Composition
ACTIVATION ENERGY
ALCOHOLS
AMINES
AQUEOUS SOLUTIONS
CARBON COMPOUNDS
CARBON DIOXIDE
CARBON OXIDES
CHALCOGENIDES
CHEMICAL REACTION KINETICS
DISPERSIONS
ENERGY
ENERGY SOURCES
EQUILIBRIUM
ETHANOL
FLUIDS
FOSSIL FUELS
FUEL GAS
FUELS
GAS FUELS
GASES
HYDROGEN COMPOUNDS
HYDROGEN SULFIDES
HYDROXY COMPOUNDS
KINETICS
MATHEMATICAL MODELS
MIXTURES
NATURAL GAS
ORGANIC COMPOUNDS
OXIDES
OXYGEN COMPOUNDS
PH VALUE
REACTION KINETICS
SOLUTIONS
SULFIDES
SULFUR COMPOUNDS
THERMAL EQUILIBRIUM