Density and Viscosity Calculation of a Quaternary System of Amine Absorbents before and after Carbon Dioxide Absorption

Abstract

Viscosity and density of amine absorbents affect directly their flow, which is involved in the process design and simulation of carbon dioxide capture. A mixture of 2-(ethyl amino) ethanol (EAE), diethylene glycol diethyl ether (DEGDEE), and water changes its phase from homogeneous to two-liquid ones on CO2 absorption. It is difficult to calculate the viscosity and density of this phase separation solution, especially those of quaternary-component phases. In this research, models to calculate the density and viscosity of the quaternary-component system of EAE/DEGDEE/water/carbamate were suggested based on nonrandom two-liquid (NRTL)-DVOL and NRTL-DVIS models. Given the component concentrations, these models can replicate well the viscosity and density of the solutions. A good calculation result with a few numbers of parameters makes the models simple and easy to use.

High-Throughput CO2 Solubility Measurement in Miscible and Liquid–Liquid Phase Separation Types of Amine Solvent Using Headspace Gas Chromatography

“…To create an energy-saving absorption process, a heat pump was also used to recover the absorption heat. The phase separation solvent with a heat pump system demonstrated an energy consumption of around 1.6 GJ/ton-CO 2 , indicating that this is an absorbent that saves energy. , The physical characteristics of this absorbent such as CO 2 solubility, density, viscosity, and heat of absorption have been measured for process design. In addition, we have reported the development of in situ composition analysis technology by attenuated total reflection Fourier transform infrared spectroscopy (ATR-FT-IR), insight into the microscopic structure by small-angle X-ray scattering (SAXS), and the methods to predict phase-separated absorbent by the conductor-like screening model for real solvents (COSMO-RS) method. , …”

Vapor–Liquid Equilibria and Density of CO2-Loaded Aqueous Methyldiethanolamine + Piperazine + Sulfolane Solutions

“…Freeman and Rochelle have determined the density and viscosity of aqueous PZ + CO 2 solutions at temperatures ranging from (293.15 to 333.15) K and the concentration range of (2 to 20) molal PZ and CO 2 loading from (0 to 0.4) . Moreover, the density of carbonated alkanolamine solutions including MEA, , DEA, MDEA, DMEA (2-dimethylaminoethanol), DEAE (2-diethylaminoethanol), 1DMA2P (1-dimethylamino-2-propanol), 3DMA1P (3-dimethylamino-1-propanol), 3A1P (3-amino-1-propanol), and EAE (ethylaminoethanol), as well as their mixtures with physical solvents, , have also been reported. All of the data reported indicate that the density of carbonated aqueous alkanolamine solutions increases as CO 2 loading increases and decreases with temperature.…”

General Equation to Estimate the Physicochemical Properties of Aliphatic Amines

“…It is known that aliphatic amines have high demand and are widely used in various fields, such as chemical, daily chemical products, and medicine. Recently, Tran et al even investigated the carbon dioxide absorption of amines. On the other hand, amines are also important atmospheric environmental monitoring compounds .…”