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Selection of State Equation and Innovative Process Design for Removing CO 2 by Azeotropic Distillation
Author(s) -
Wang Haiqin,
Wang Ce,
Zhang Zubin,
Fan Minglong,
Yan Xiaodong,
Li Fengqi
Publication year - 2021
Publication title -
chemical engineering and technology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.403
H-Index - 81
eISSN - 1521-4125
pISSN - 0930-7516
DOI - 10.1002/ceat.202000409
Subject(s) - thermodynamics , chemistry , distillation , equation of state , absolute deviation , fraction (chemistry) , mixing (physics) , vapor–liquid equilibrium , consistency (knowledge bases) , azeotropic distillation , chromatography , mathematics , statistics , physics , geometry , quantum mechanics
Abstract A thermodynamic consistency test was performed on the gas‐liquid equilibrium data of three binary mixtures, namely, CH 4 ‐C 2 H 6 , CH 4 ‐CO 2 , and C 2 H 6 ‐CO 2 , measured by Wei and Brown at three different temperatures to verify the reliability of the data. Peng‐Robinson (PR), Redlich‐Kwong (RK), and Soave‐Redlich‐Kwong (SRK) equations of state combined with Margles mixing rules were used to fit the gas‐liquid equilibrium data of these three models. The results indicate that the PR‐Margles mixed model can make the average absolute deviation of test data and calculated data pressure and vapor fraction less than 0.19 and 0.0025, respectively, which is superior to RK‐Margles and SRK‐Margles mixed models. Finally, an azeotropic distillation method with C 2 H 6 as entrainer for removing CO 2 from natural gas was explored and optimized.