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Simulation on thermodynamic state of ammonia carbonation at low temperature and low pressure |
Jingcai ZHAO, Xingfu SONG( ), Ze SUN, Jianguo YU |
National Engineering Research Center for Integrated Utilization of Salt Lake Resource, East China University of Science and Technology, Shanghai 200237, China |
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Abstract This study on thermodynamic property of NH3-CO2-H2O system provided the basic data for ammonia carbonation. Simulations on vapor-liquid equilibrium (VLE) of ammonia carbonation with different physical properties were discussed in NH3-H2O and NH3-CO2-H2O systems, respectively. The results indicated that at low temperature (303.15 K–363.15 K) and pressure (0.1–0.4 MPa), the PR (Peng-Robinson) equation was suitable for the description of the thermodynamic state in NH3-H2O system. NRTL (Non-Random-Two-Liquid) series models were selected for NH3-CO2-H2O mixed electrolyte solution system. VLE data regression results showed that NRTL series models were suitable for describing thermodynamic properties of NH3-CO2-H2O system, because average relative error fitting with each model was about 1%. As an asymmetric electrolytes model in NRTL model, E–NRTLRK (Electrolyte NRTL Redlich Kwong) could most accurately fit VLE data of NH3-CO2-H2O system, with fitting error less than 1%. In the extent temperature range of 273.15 K–363.15 K, the prediction of product component using E-NRTLRK model for ammonia carbonation agreed well with the data reported in literature.
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Keywords
vapor-liquid equilibrium
activity coefficient
carbon dioxide
ammonia
NRTL
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Corresponding Author(s):
SONG Xingfu,Email:xfsong@ecust.edu.cn
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Issue Date: 05 December 2013
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