Density, Viscosity, and Performances of Carbon Dioxide Capture in 16 Absorbents of Amine + Ionic Liquid + H₂O, Ionic Liquid + H₂O, and Amine + H₂O Systems

Abstract

A series of novel ionic liquids, 2-aminoethanol tetrafluoroborate ([MEA]and 2-[2-hydroxyethyl(methyl)amino] ethanol sulfate ([MDEA][SO 4 ]), were synthesized and characterized for carbon dioxide capture in this work. Densities and viscosities of ionic liquids (1-butyl-3-methylimidazolium tetrafluoroborate, [MEA][BF 4 ], [MDEA][BF 4 ], [MDEA][Cl], [MDEA][PO 4 ], and [MDEA][SO 4 ]), amines + ionic liquids + H 2 O, ionic liquids + H 2 O, and amines + H 2 O were measured at temperatures ranging from (303.15 to 343.15) K at different mass fractions. These 16 different absorbents were prepared by mixing two or three compounds of 2-aminoethanol (MEA), 2-[2-hydroxyethyl(methyl)amino] ethanol (MDEA), 2-[bis(2hydroxyethyl)amino] ethanol (TEA), ionic liquids, and water. The carbon dioxide capture rate and carbon dioxide capture capacity in the 16 different absorbents were measured at 303.15 K and 1.50 MPa. The experimental results showed that the viscosities of these absorbents are less than 17.00 mPa • s at 303.15 K. Among these absorbents, the MDEA + [MDEA][Cl] + H 2 O + piperazine system shows the best performance on carbon dioxide capture.

Lubricity Improvement of Imidazolium Cation-based Ionic Liquids Treated with Carbon Dioxide

“…Ionic liquids also have high affinity with carbon dioxide 4), 5) . The viscosity of ionic liquid could be reduced by the absorption of carbon dioxide 6) , indicating that ionic liquids absorbing carbon dioxide is used as lubricants, which have few shear resistance and would produce easily lubricating films. The present study demonstrated that ionic liquids containing imidazolium cations and phosphate anions had superior lubricities in friction tests between stainless steel surfaces and the lubrication properties were improved by the absorption of carbon dioxide into the ionic liquid.…”

Measurement and correlation of physical properties of aqueous solutions of tetrabutylammonium hydroxide, piperazine and their aqueous blends

“…Among these greenhouse gases, CO 2 contributing increases in global temperature to 6 °C [2, [3][4][5]. There is immense impact of global warming to the economic, social and environmental life.…”

Methodology of non-equilibrium thermodynamics for kinetics research of CO2 capture by ionic liquids

“…It is reported that the capture of CO 2 alone will increase the energy requirements of a plant by 25%-40% [3]. Therefore, many scientists all over the world are focusing on the investigations of the environment-friendly capture technology with higher efficiency and lower energy consumption compared with the current technologies [3][4][5][6][7][8][9].…”

“…However, due to the corrosion, volatility, toxicity of the amines, and their high regeneration energy requirement in the applications, in recent years, scientists all over the world have designed and synthesized many ionic liquids (ILs) as absorbents to absorb and separate CO 2 from the gas mixtures [5][6][7][8][9][15][16][17][18][19][20][21][22][23][24][25][26][27][28][29][30]. The IL-based CO 2 capture technology is considered to be a promising and competitive way to separate CO 2 because of its advantages of non-volatility, recycling, environment-friendliness, functionality, and high efficiency of CO 2 capture [9]. Although ionic liquids show a promising prospect for CO 2 capture, their industrialization and commercialization still face difficulties due to their high viscosity and high price [9,30].…”

“…The IL-based CO 2 capture technology is considered to be a promising and competitive way to separate CO 2 because of its advantages of non-volatility, recycling, environment-friendliness, functionality, and high efficiency of CO 2 capture [9]. Although ionic liquids show a promising prospect for CO 2 capture, their industrialization and commercialization still face difficulties due to their high viscosity and high price [9,30]. To develop the process intensification technologies for IL-based CO 2 capture, it is necessary to investigate the kinetics process of CO 2 capture and to study the effects of different operation parameters on the rate of CO 2 capture.…”