High-pressure solubilities of carbon dioxide in ionic liquids based on bis(trifluoromethylsulfonyl)imide and chloride

Manic, Marina S.; Queimada, António J.; Macedo, Eugénia A.; Najdanovic‐Visak, Vesna

doi:10.1016/j.supflu.2012.02.016

Cited by 59 publications

(24 citation statements)

References 54 publications

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“…The ILs [C 12 21 , purity > 99 wt %, and water content < 600 ppm) were purchased from Shanghai Chengjie Chemical Co., Ltd. They were first treated in a vacuum rotary evaporator to remove the volatile impurities.…”

Section: Methodsmentioning

confidence: 99%

Gas solubility in long‐chain imidazolium‐based ionic liquids

2017

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Significance The gas solubility in 1‐dodecyl‐3‐methylimidazolium [C12MIM] based ionic liquids (ILs) was measured at temperatures (333.2, 353.2, and 373.2) K and pressures up to 60 bar for the first time. The popular UNIFAC‐Lei model was successfully extended to long‐chain imidazolium‐based IL and gas (CO2, CO, and H2) systems. The free volume theory was used to explain the gas solubility and selectivity in imidazolium‐based ILs by calculating the fractional free volume and free volume by the COSMO‐RS model. Furthermore, the excess enthalpy of gas‐IL system was concerned to provide new insights into temperature dependency of gas (CO2, CO, and H2) solubility in ILs. The experimental data, calculation, and theoretical analysis presented in this work are important in gas separations with ILs or supported ionic liquid membranes. © 2017 American Institute of Chemical Engineers AIChE J, 63: 1792–1798, 2017

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Section: Methodsmentioning

confidence: 99%

Gas solubility in long‐chain imidazolium‐based ionic liquids

2017

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“…4.6. Short-Term Reaction Characteristics in Seawater Figure 5 shows the CO 2 concentration in seawater over time based on the results of the six diffusion experiments performed under the equilibrium pressures of 2, 3, and 5 bar and the temperatures of 25 and 32 • C. The concentration of CO 2 increased with the increase in equilibrium pressure and the decrease in reaction temperature, while the dissolution velocity of CO 2 was determined using Equation (7). As shown in Table 5, previous studies derived the CO 2 diffusion coefficient under high-pressure and high-temperature conditions.…”

Section: Experimental Approach Considering Concentration In Seawatermentioning

confidence: 99%

“…Increasing the concentration of 2-amino-2-methyl-1-propanol and adding piperazine affected the absorption capacity, where the CO 2 absorption capacity of the solvent increased under a high operation pressure and low operating temperature. Manic et al [7] measured the solubility of CO 2 in seven ionic liquids in the [8][9][10][11][12][13][14][15][16][17][18][19][20][21][22] MPa pressure range and at temperatures of 313.2 and 323.2 K. They found that the solubility of CO 2 increased when the pressure increased and the temperature decreased.…”

Section: Introductionmentioning

confidence: 99%

The Performance of Low-Pressure Seawater as a CO2 Solvent in Underwater Air-Independent Propulsion Systems

Park

Choi

2020

JMSE

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Air-independent propulsion systems have improved the performance and decreased the vulnerability of underwater weapon systems. Reforming systems, however, generates large amounts of water and CO2. The recovery or separation of CO2, a residual gas component generated in vessels, entails considerable cost and energy consumption. It is necessary to understand the characteristics of the interaction between CO2 and seawater under the conditions experienced by underwater weapon systems to design and optimize a CO2 treatment process for dissolving CO2 in seawater. In this study, numerical analysis was conducted using the derived experimental concentration and MATLAB. The diffusion coefficient was derived as a function of temperature according to the CO2 dissolution time. Experiments on CO2 dissolution in seawater were conducted. The concentration of CO2 according to the reaction pressure and experimental temperature was obtained. The diffusion coefficient between CO2 and seawater was found to be 6.3 × 10−5 cm2/s at 25 °C and 7.24 × 10−5 cm2/s at 32 °C. CO2 concentration could be estimated accurately under vessel operating conditions using the derived CO2 diffusion coefficients. Optimal design of the residual gas treatment process will be possible using the derived seawater–CO2 diffusion coefficients under the actual operating conditions experienced by underwater weapon systems.

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“…Complexation of the reducing agent, PIL monomer or even the catalyst with tin aggregates is likely interfering with all polymerizations. Chloride, besides interfering with polymerization, is an inferior anion to [Tf2N], with overall reduced gas solubility [57][58]. The P2-P3 permeance jump is however not attributed to the possibility of entrapped PIL monomer within the PIL brush.…”

Section: Gas Transport Behavior Of P1-p5mentioning

confidence: 99%

“…An excess of water causes the formation of Si-O-Si bonds, leading to the formation of organosilane multilayers [49][50][51][52][53]. Other factors found to have an influence are the temperature, solvent, reaction time, and the size and concentration of the linker, among others, which must be tuned for best coverage [54][55][56][57][58]. 6.…”

Section: Organosilanes: Alkoxysilane and Silyl Halide Linking Functionsmentioning

confidence: 99%

Growing to Shrink: Grafting alumina mesopores for molecular separations

Merlet

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Hybrid, ceramic-based membranes combine the stability of porous ceramic oxides with the functionality of polymers. The wide range of polymers allows for tailor-made materials matching the requirements of the target application. This thesis expands upon the materials, fabrication techniques and potential applications of hybrid, ceramic-based membranes. Chapter 2 first gives an overview of the recent progress in grafted ceramics for organic solvent nanofiltration (OSN) applications. It provides an overview of suitable organic-inorganic linking functions, reviews the strategies to tune the pore surface and compares the resulting membranes. Also discussed are the capabilities and shortcomings of both the characterization tools and the transport models used to describe this class of membranes. The link between material chemistry, grafting technique and performance is established as the challenges awaiting the researcher of hybrid, ceramic-based membranes are identified. This chapter serves to frame the advances presented in the following Chapters for the reader. Chapter 3 presents the grafting-from technique applied to the confined mesopores of ɣ-alumina. It is the first instance of controlled polymerization initiated from the surface of a high-curvature concave geometry. Polystyrene was grown inside 5 nm diameter pores to shrink to a desired degree, demonstrating the ability to tune the membrane selectivity. The parameters choices of the method used-surface-initiated, activators-regenerated-by-electron-transfer, atom-transfer radical polymerization (SI-ARGET-ATRP)-are detailed. The graft is characterized by TGA, AFM, and FTIR, and it is shown that the graft length is solvent-dependent. Also demonstrated is the application potential of this new class of hybrid, ceramic-based membrane as an organic solvent nanofiltration membrane. The top performing membrane exhibited a toluene permeability of 2.0 L.m-2 h-1 bar-1 accompanied by a 90% retention of diphenylanthracene (MW 330 g mol-1). Chapter 4 features further development of the grafting-from method with a novel material and for a different application, poly(ionic liquid) [StyMim][Tf2N] for CO2 separation. The same support substrate as Chapter 3 was used for SI-ARGET-ATRP, although adjustments to the reaction reagents and parameters were required. These are explained alongside the gas transport behavior through membranes made by successive polymerizations. The dense-pore gas separation membrane is characterized by means of AFM, XPS, SEM/EDS, and FTIR. A CO2 permeance of 0.47×10-7 (mol.m-2 s-1 Pa-1) and a CO2/N2 permselectivity of 14 was achieved, providing an encouraging beginning for development of this new membrane class. Chapter 5 presents two new unique achievements: a thioether-based aromatic crosslinked selective layer, and a green interfacial polymerization (IP) technique. Before this work, toxic solvents were use for the production of chemically and thermally resistant nanofiltration membranes. The use of non-toxic solvents for the synthesis of these membranes w...

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High-pressure solubilities of carbon dioxide in ionic liquids based on bis(trifluoromethylsulfonyl)imide and chloride

Cited by 59 publications

References 54 publications

Gas solubility in long‐chain imidazolium‐based ionic liquids

Gas solubility in long‐chain imidazolium‐based ionic liquids

The Performance of Low-Pressure Seawater as a CO2 Solvent in Underwater Air-Independent Propulsion Systems

Growing to Shrink: Grafting alumina mesopores for molecular separations

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