A Novel Model for Correlation and Predication of the Equilibrium CO2 Solubility in Seven Tertiary Solvents

Abstract

In this work, the novel tertiary amines, 4-(dimethylamino)-2-butanol (DMAB), 4-(dipropylamino)-2-butanol (DPAB), 4-((2-hydroxyethyl)(methyl)amino)-2-butanol (HEMAB) and 4-((2-hydroxyethyl)(ethyl)amino)-2-butanol (HEEAB), 1-(2-Hydroxyethyl)-piperidine (1-(2-HE)PP), 1-(2-Hydroxyethyl)pyrrolidine (1-(2-HE)PRLD) and 3-diethylamino-1,2-propanediol (DE-1,2-PD) were synthesized or screened to reduce energy requirement of PCC to 2.0GJ/ton CO2. The CO2 equilibrium solubility of those solvents were provided. A new K2 correlation model, Liu et al. model, was also developed to correlate and predict the CO2 equilibrium solubility in those new amines solution. It was found that the new model could fit the CO2 equilibrium solubility in those newly solution with absolute average deviations (ADDs) for DMAB, DPAB, HEMAB, HEEAB, 1-(2-HE)PP, 1-(2-HE)PRLD, DE-1,2-PD of 5.4%, 24.7%, 8.3%, 4.2%, 1.7%, 4.1%, and 2.3%, respectively.