Abstract
A synthetic methodology has been employed to explore the phase behavior characteristics of solution mixtures containing 2-(diethylamino)ethyl acrylate and 2-(diethylamino)ethyl methacrylate with supercritical CO2 under high-pressure conditions. This investigation covers a wide spectrum of temperatures and pressures, up to 393.2 K and 21.86 MPa, respectively. Specifically, the phase equilibria for the CO2 + 2-(diethylamino)ethyl acrylate and CO2 + 2-(diethylamino)ethyl methacrylate binary systems were investigated. In both of these binary systems, critical mixed curves with maximum peak in the pressure–temperature domain were distinctly observed. This peak was situated amidst the critical temperatures of CO2 and the associated constituent, which is either 2-(diethylamino)ethyl acrylate or 2-(diethylamino)ethyl methacrylate. It is noteworthy that both of these binary systems validate a type-I phase behavior.In the theoretical analysis, solubility curves were generated using the Peng-Robinson equation of state and van der Waals mixing rules. The comparison between the projected and experimental outcomes for the CO2 + 2-(diethylamino)ethyl acrylate and CO2 + 2-(diethylamino)ethyl methacrylate binary systems showed a significant level of concurrence, highlighting the efficacy of the Peng-Robinson equation of state.
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