Abstract
This work reports equilibrium data for two amines, 2-piperidineethanol (2-PPE) and 1-(2-hydroxyethyl)pyrrolidine (1-(2HE)PRLD), and their aqueous solutions. The pressure, temperature, and composition data are used to calculate experimental activities. Data cover temperatures from 363 to 426 K for the pure amines and from 323 to 373 K for the aqueous solutions. A UNIQUAC model was used to represent the binary vapor–liquid equilibria (VLE), whereas the Antoine equation was used for pure components. In an aqueous solution, the vapor pressure of 1-(2-hydroxyethyl)pyrrolidine (1-(2HE)PRLD) over the measured composition and temperature ranges is higher than that of 2-piperidineethanol (2-PPE). The developed UNIQUAC models represent the data well. For 2-piperidineethanol (2-PPE), the model gave 1.9% deviations for total pressure, 12.4% for vapor-phase composition, 12.7% for the calculated activity coefficients, and 16.2% for the excess heat capacity. In the case of 1-(2-hydroxyethyl)pyrrolidine (1-(2HE)PRLD), the model was slightly more accurate, representing the data with 1.7% deviation for total pressure, 5.9% for vapor-phase composition, and 5.2% for the calculated activity coefficient.
Highlights
Human activities mainly cause increasing carbon dioxide (CO2) concentrations in our atmosphere
Vapor pressure for pure amines and total pressure over their aqueous solutions up to 0.85 in mass fraction (∼0.44 mole fractions) of 2-PPE and 0.80 in mass fraction (∼0.40 mole fractions) of 1-(2HE)PRLD were measured at different temperatures
Samples were collected at equilibrium, and both liquid and vapor phases were analyzed
Summary
Human activities mainly cause increasing carbon dioxide (CO2) concentrations in our atmosphere. Vapor pressure is measured in a closed vessel (with constant volume) at a constant temperature.[6] The liquid composition can be determined from the initial liquid fed into the cell vessel or by analyzing liquid samples. This type of experiment produces typically PTx data, and vapor-phase composition is estimated from a thermodynamic model.[7−9] An ebulliometer can provide dynamic measurements of PTx or PTxy data for pure, binary, and ternary systems. The experimental data were modeled using the UNIQUAC framework.[11]
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