Studies on viscosity and conductivity of 1,8-diazabicyclo[5.4.0]undec-7-ene (DBU)-glycerol and CO2-DBU-glycerol solutions at temperatures from 288.1 K to 328.1 K

Liu, Yingying; Lin, Si Jian; Lu, Houfang; Liu, Changjun; Wu, Kejing; Jiang, Wei; Liang, Bin

doi:10.1016/j.jct.2019.04.017

Cited by 16 publications

(4 citation statements)

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“…To investigate the effect of the molar ratio of DBU to glycerol on CO 2 desorption performance, CO 2 -rich solutions with the same initial CO 2 loadings (Figure ) were studied. Considering the high viscosity of DBU-glycerol solutions, the CO 2 loadings were kept at 1.60 mol/kg (∼7 wt %) in DBU-glycerol-CO 2 solutions, which is usually the loading of 30 wt % MEA in a commercialized process. , At this CO 2 -loading, DBU can only react with one −OH group of glycerol in the solution . To remove the regenerated CO 2 as soon as possible, N 2 was bubbled in the solution.…”

Section: Resultsmentioning

confidence: 99%

“…Compared with 1-propanol and 1-hexanol, , higher boiling points of DBU and glycerol than 1-propanol (97 °C) and 1-hexanol (157 °C) are preferred due to less evaporation of solvent. The physicochemical properties, such as the density, viscosity, conductivity, and surface tension, as well as the CO 2 solubility of the resultant DBU-glycerol solution have been well investigated. − This work focused on the performance of DBU-glycerol solvent in CO 2 absorption and desorption processes. The effect of solvent composition, operation temperature, and the cyclic absorption–desorption performance of the DBU-glycerol solvent were systemically investigated.…”

Section: Introductionmentioning

confidence: 99%

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DBU-Glycerol Solution: A CO₂ Absorbent with High Desorption Ratio and Low Regeneration Energy

Zhu

et al. 2020

Environ. Sci. Technol.

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1,.0]-undec-7-ene (DBU)-glycerol solution is employed as a promising CO 2 absorbent. The regeneration of the CO 2 -loaded solution is of vital importance for its commercialization. It was investigated and compared with 30 wt % monoethanolamine (MEA). Variables affecting the absorption and desorption processes were studied, including the solvent composition, reaction temperature, and agitation. It shows that the absorption capacity for DBU-glycerol is comparable with 30 wt % MEA, and the desorption ratio for CO 2 -loaded DBU-glycerol mixture can reach as high as 95% in 60 min, 363 K at the 3:1 molar ratio of DBU to glycerol, while it is only 68% even after 165 min for CO 2 -saturated 30 wt % MEA. DBU-glycerol solution has higher cycling CO 2 loading than 30 wt % MEA. Its cyclic capacity could keep above 90% after 10 cycles of absorption−desorption experiments. The desorption reaction is irreversible at the initial stage, and the reaction rate is expected as a first-order reaction from 349 to 377 K, and the apparent activation energy is 68.94 kJ/mol. Moreover, the heat duty of the reboiler during regeneration is estimated to be reduced by about 27% when compared with 30 wt % MEA.

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Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

DBU-Glycerol Solution: A CO₂ Absorbent with High Desorption Ratio and Low Regeneration Energy

Zhu

et al. 2020

Environ. Sci. Technol.

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“…For example, in the absorption process, the viscosity of solvents can affect the energy use through transportation and alter the mass and heat transfer of the reactions. Density and viscosity are fundamental to calculate the pressure drops of a liquid composition flowing through a tube . However, the mixing of different components usually lead to nonideal solutions.…”

Section: Introductionmentioning

confidence: 99%

Some Physicochemical Properties of Binary Mixtures of Glycerol with Butanol Isomers in the Temperature Range 293.15–318.15 K and Ambient Pressure

Chabouni

Amireche

2020

J. Chem. Eng. Data

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The aim of this work is experimental determination of density, ρ, refractive index, n D, viscosity, η, and their derivatives for four binary systems containing glycerol in the mixture with butanol isomers: 1-butanol, 2-butanol, isobutanol, and tert-butanol. Experimental results were carried out for all concentration ranges at atmospheric pressure and at a temperature interval of 293.15–318.15 K except for the mixtures with tert-butanol because of high melting temperatures, so the measurements were made from 303 K. Results of experimental measurements were further used to estimate, for each investigated mixture, excess molar volumes, partial molar volumes, apparent molar volumes, thermal isobaric expansibilities, excess thermal expansibilities and partial molar volumes at infinite dilution, the viscosity deviations, and the excess energies of activation. In addition to that, the infrared spectra of all the systems have been recorded at three concentrations at room temperature. The excess molar volumes V E and excess thermal expansitivities for all investigated systems are found negative over the whole composition range and at all temperatures studied, and deviations from ideality increase with increasing temperature. Negative values of viscosity deviation appear for all systems, but contrary to the excess molar volumes, the deviations from ideality decrease with temperature rising. The excess molar calculated properties were well fitted using the empirical Redlich–Kister polynomial. All the properties measured and calculated in this work have shown a significant influence of the structure of the molecules including the size, shape, and the position of the hydroxyl groups of the components. As expected, the infrared spectra of these binary mixtures prepared with these four butanol isomers show strong hydrogen bonding capability.

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“…Chemical physical properties of neat DBU [37][38][39] The interatomic potential chosen for this study succeeds in describing the experimental diffraction data (see Figure 4) and the correspondingly generated MD trajectories are then reliably used to account for structural properties of these systems.…”

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Structural features of selected protic ionic liquids based on a super-strong base

Triolo

Celso

Ottaviani

et al. 2019

Phys. Chem. Chem. Phys.

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Studies on viscosity and conductivity of 1,8-diazabicyclo[5.4.0]undec-7-ene (DBU)-glycerol and CO2-DBU-glycerol solutions at temperatures from 288.1 K to 328.1 K

Cited by 16 publications

References 40 publications

DBU-Glycerol Solution: A CO₂ Absorbent with High Desorption Ratio and Low Regeneration Energy

DBU-Glycerol Solution: A CO₂ Absorbent with High Desorption Ratio and Low Regeneration Energy

Some Physicochemical Properties of Binary Mixtures of Glycerol with Butanol Isomers in the Temperature Range 293.15–318.15 K and Ambient Pressure

Structural features of selected protic ionic liquids based on a super-strong base

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Studies on viscosity and conductivity of 1,8-diazabicyclo[5.4.0]undec-7-ene (DBU)-glycerol and CO2-DBU-glycerol solutions at temperatures from 288.1 K to 328.1 K

Cited by 16 publications

References 40 publications

DBU-Glycerol Solution: A CO2 Absorbent with High Desorption Ratio and Low Regeneration Energy

DBU-Glycerol Solution: A CO2 Absorbent with High Desorption Ratio and Low Regeneration Energy

Some Physicochemical Properties of Binary Mixtures of Glycerol with Butanol Isomers in the Temperature Range 293.15–318.15 K and Ambient Pressure

Structural features of selected protic ionic liquids based on a super-strong base

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Product

Resources

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Studies on viscosity and conductivity of 1,8-diazabicyclo[5.4.0]undec-7-ene (DBU)-glycerol and CO2-DBU-glycerol solutions at temperatures from 288.1 K to 328.1 K

DBU-Glycerol Solution: A CO₂ Absorbent with High Desorption Ratio and Low Regeneration Energy

DBU-Glycerol Solution: A CO₂ Absorbent with High Desorption Ratio and Low Regeneration Energy