Viscosity and density measurements of aqueous amines at high pressures: MDEA-water and MEA-water mixtures for CO2 capture

Abstract

Viscosity and density are thermophysical properties crucial to characterizing any kind of fluid such as aqueous amines. These blends are becoming more and more relevant for their CO 2 capture potential, such that having accurate viscosity and density measurements would prove useful. Densities and viscosities of these mixtures at atmospheric pressure may be found in the literature although it is more difficult to find values at high pressures, these potentially proving interesting when seeking to provide a full description of these fluids. Viscosity and density measurements at high pressures (up to 120 MPa) and at temperatures between 293.15 and 353.15 K of MDEA + water and MEA + water mixtures (both from 10 % to 40 % amine mass fraction) are presented in this work. Density measurements were performed with an Anton Paar DMA HPM densimeter with an expanded uncertainty (k = 2) less than ± 0.7 kg•m-3. A falling body technique was used to measure viscosities at high pressures due to its sturdiness in terms of corrosion. Details of this latter equipment are presented, including calibration using n-dodecane and uncertainty calculations, which give a relative expanded uncertainty (k = 2) of less than ± 2.4 % for the highest viscosity and ± 2.9 % for the lowest.

Model uncertainty of interfacial area and mass transfer coefficients in absorption column packings

“…Onda's correlations for liquid-phase mass transfer fulfill ±20% of agreement with the large amount of data on organic liquids and water (Potnis and Lenz, 1996). (Arachchige et al, 2013) ± 0.12 mPa·s (95% confident level, k=2) (Sobrino et al, 2016) Density ± 4.42 kg/m 3 ( 95% confident level, k=2)(CO2 loaded solution) (Jayarathna et al, 2013) ±0.05 kg/m 3 (Standard uncertainty) (CO2 loaded solution) (Amundsen et al, 2009) Surface tension ± 0.02 mN/m (accuracy) (Vazquez et al, 1997) ± 1.2 mN/m ( 95% confident level, k=2) (Jayarathna et al, 2013) DOI: 10.3384/ecp17138144…”

Rheological, Thermodynamic, and Gas Solubility Properties of Phenylacetic Acid‐Based Deep Eutectic Solvents

“…When the classical amine + water solution systems are considered, in order to compete with such systems, higher DES system temperatures are required . Promising features of the prepared DESs have been noticed for the gas absorption capacity between two ratios of DESs and as well as for the gas selectivity between CO 2 and N 2 .…”

Electronic and thermodynamic properties of the amino- and carboxamido-functionalized C-60-based fullerenes: Towards non-volatile carbon dioxide scavengers

“…Pressure increase shifts the equilibrium of the carbamate formation reaction rightwards, since the total number of molecules in the system decreases. 40,41 Relatively high free energies of the carbamate formation imply accordingly low regeneration energy costs, i.e. those for shifting the reaction equilibrium leftwards.…”