Solubility of CO2 in nonaqueous system of 2-(butylamino)ethanol with 2-butoxyethanol: Experimental data and model representation

doi:10.1016/j.cjche.2021.11.003

Abstract

Abstract: Nonaqueous amine-based system is an attractive solution to overcome high-energy-intensive CO₂ capture process using the conventional aqueous amines. Advanced nonaqueous absorbent of 2- (butylamino)ethanol (BAE) with 2-butoxyethanol (2-BE) has been recently proposed for low-energyconsumption CO₂ capture. In this work, Henry’s law constants of CO₂ in the BAE/2-BE blend were obtained by N₂O/CO₂ analogy, and correlated in the temperature range of (283–333) K. Vapor-liquid equilibrium (VLE) data for the BAE + CO₂ + 2-BE system at 65.4% (mass) BAE were also determined in a stirred equilibrium cell at temperatures of (313–393) K and CO₂ partial pressures up to 275 kPa. A single apparent equilibrium constant K_{CO_2,app} was proposed for this system and correlated as a function of temperature, carbonated degree of amine and CO₂ loading. Solubility data were well represented by the modified Kent-Eisenberg model with an average absolute relative deviation (AARD) of 13%.

Key words: Solubility, CO₂ capture, Nonaqueous absorbent, 2-(Butylamino)ethanol, 2-Butoxyethanol, Model

摘要： Nonaqueous amine-based system is an attractive solution to overcome high-energy-intensive CO₂ capture process using the conventional aqueous amines. Advanced nonaqueous absorbent of 2- (butylamino)ethanol (BAE) with 2-butoxyethanol (2-BE) has been recently proposed for low-energyconsumption CO₂ capture. In this work, Henry’s law constants of CO₂ in the BAE/2-BE blend were obtained by N₂O/CO₂ analogy, and correlated in the temperature range of (283–333) K. Vapor-liquid equilibrium (VLE) data for the BAE + CO₂ + 2-BE system at 65.4% (mass) BAE were also determined in a stirred equilibrium cell at temperatures of (313–393) K and CO₂ partial pressures up to 275 kPa. A single apparent equilibrium constant K_{CO_2,app} was proposed for this system and correlated as a function of temperature, carbonated degree of amine and CO₂ loading. Solubility data were well represented by the modified Kent-Eisenberg model with an average absolute relative deviation (AARD) of 13%.

关键词: Solubility, CO₂ capture, Nonaqueous absorbent, 2-(Butylamino)ethanol, 2-Butoxyethanol, Model

Yu Dong, Tiantian Ping, Shufeng Shen. Solubility of CO₂ in nonaqueous system of 2-(butylamino)ethanol with 2-butoxyethanol: Experimental data and model representation[J]. Chinese Journal of Chemical Engineering, 2022, 41(1): 441-448.

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Solubility of CO₂ in nonaqueous system of 2-(butylamino)ethanol with 2-butoxyethanol: Experimental data and model representation

Solubility of CO₂ in nonaqueous system of 2-(butylamino)ethanol with 2-butoxyethanol: Experimental data and model representation

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