Liquid density, viscosity, surface tension, and spectroscopic investigation of 1,2-ethanediamine + 1,2-propanediol for CO2 capture

Abstract

Liquid densities, viscosities, and surface tensions play significant roles in fluid flow and industrial applications for CO2 capture. These data of 1,2-ethanediamine (EDA)+1,2-propanediol (PPD) binary system were measured under atmospheric pressure at T=(293.15 to 318.15) K throughout the entire concentration range. According to the experimental viscosities and densities, the viscosity deviation and excess molar volume values were respectively calculated, and the Redlich-Kister equation was used to fit the coefficients and to evaluate the deviations. The system exhibited negative excess molar volume values with a minimum at x1≈0.54 at experimental temperatures, and a maximum was found at x1≈0.76 for viscosity deviation. The solubility of CO2 was measured at different flow rates, and the maximum solubility was about 0.57g CO2 per 1g EDA+PPD system at 250mL/min CO2 flow rate. Furthermore, the intermolecular interaction of PPD with EDA was systemically discussed according to FTIR, UV–Vis, 1H NMR, and fluorescence spectral results, surface tension, and electrical conductivity data, and it was expressed as the form of HO-CH2(CH3)CH2O-H·NH2CH2CH2N(H2).