Measurement of the (p, ρ, T) Behavior of Liquid MEA and DEA at Temperatures from (293.15 to 423.15) K and Pressures up to 90 MPa

Abstract Densities in the homogeneous liquid phase of (mono-)ethanolamine (MEA) and diethanolamine (DEA) were investigated using a commercially available high-pressure vibrating-tube densimeter (VTD). Due to melting point experimental materials, setup VTD had be modified by an insulated housing entire piping including pressure pump. The could heated up temperature-controlled heating fan. samples with purity (0.9994 or 0.9950) mole fraction, respectively, decanted within inert protective argon atmosphere further degassed several freeze–pump–thaw cycles. Density measurements carried out at temperatures between (293, 313 423) K pressures (5 90) MPa. resulting 140, 120 ( p , ρ T ) data points, explicitly extend published database for MEA DEA, regards pressure. A comparison currently used equations state DEA revealed maximum relative deviation – 0.18 % 0.41 each highest temperature Considering measurement uncertainties temperature, pressure, oscillation period, as well from calibration impurities sample, combined expanded uncertainty k = 2) density varied (0.1027 0.1038) (0.1104 0.1130) %, respectively. was previously calibrated comprehensive water helium been validated pure propane.