Vapour pressure measurements of ammonia/ionic liquids mixtures as suitable alternative working fluids for absorption refrigeration technology

Cera-Manjarres, Andry; Salavera, Daniel; Coronas, Alberto

doi:10.1016/j.fluid.2018.01.006

Cited by 53 publications

(35 citation statements)

References 57 publications

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“…Methane solubility in the protic ionic liquid: the CH 4 gas solubility in the H-VIM TFSI was calculated by using the experimental vapour pressure equilibrium. The vapor pressure of the protic ionic liquid mixture with methane was measured at 333 K at five compositions (from 0.0056 to 0.0165 methane molar fraction) in the experimental set-up described by Coronas et al [ 35 ] using a static isochoric method.…”

Section: Methodsmentioning

confidence: 99%

Exploring the Gas-Permeation Properties of Proton-Conducting Membranes Based on Protic Imidazolium Ionic Liquids: Application in Natural Gas Processing

et al. 2018

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This experimental study explores the potential of supported ionic liquid membranes (SILMs) based on protic imidazolium ionic liquids (ILs) and randomly nanoporous polybenzimidazole (PBI) supports for CH4/N2 separation. In particular, three classes of SILMs have been prepared by the infiltration of porous PBI membranes with different protic moieties: 1-H-3-methylimidazolium bis (trifluoromethane sulfonyl)imide; 1-H-3-vinylimidazolium bis(trifluoromethane sulfonyl)imide followed by in situ ultraviolet (UV) polymerization to poly[1-(3H-imidazolium)ethylene] bis(trifluoromethanesulfonyl)imide. The polymerization process has been monitored by Fourier transform infrared (FTIR) spectroscopy and the concentration of the protic entities in the SILMs has been evaluated by thermogravimetric analysis (TGA). Single gas permeability values of N2 and CH4 at 313 K, 333 K and 363 K were obtained from a series of experiments conducted in a batch gas permeance system. The results obtained were assessed in terms of the preferential cavity formation and favorable solvation of methane in the apolar domains of the protic ionic network. The most attractive behavior exhibited poly[1-(3H-imidazolium)ethylene]bis(trifluoromethanesulfonyl)imide polymeric ionic liquid (PIL) cross-linked with 1% divinylbenzene supported membranes, showing stable performance when increasing the upstream pressure. The CH4/N2 permselectivity value of 2.1 with CH4 permeability of 156 Barrer at 363 K suggests that the transport mechanism of the as-prepared SILMs is solubility-dominated.

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Section: Methodsmentioning

confidence: 99%

Exploring the Gas-Permeation Properties of Proton-Conducting Membranes Based on Protic Imidazolium Ionic Liquids: Application in Natural Gas Processing

et al. 2018

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“…29,30 Presently, most of investigation was focused on the performance evaluation of VACs with ILs-refrigerants as a substitute working pair to LiBr-H 2 O. 22,[31][32][33][34][35][36][37] Literature study also reports various type of refrigerants in combination to IL for VACs 19,38 likely ammonia, 15,39,40 water, 23,25,[41][42][43] and hydrocarbons. 2,16,44 Shiflett and Yokozcki 13 have patented the use of ILs-refrigerant mixture as alternative working pairs in particularly 1-ethyl-3-metyl imidazolium tetrafluoroborate [emim] [BF4]-H 2 O.…”

Section: Introductionmentioning

confidence: 99%

“…Presently, most of investigation was focused on the performance evaluation of VACs with ILs‐refrigerants as a substitute working pair to LiBr‐H 2 O 22,31-37 . Literature study also reports various type of refrigerants in combination to IL for VACs 19,38 likely ammonia, 15,39,40 water, 23,25,41-43 and hydrocarbons 2,16,44 .…”

Section: Introductionmentioning

confidence: 99%

Thermodynamic properties and performance evaluation of [EMIM] [DMP]‐H ₂ O working pair for absorption cooling cycle

Takalkar

2019

Int J Energy Res

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The combination of ionic liquid-refrigerant based [EMIM][DMP]-H 2 O as an alternative working pair for single effect vapor absorption cycles (VACs) is assessed and optimized by using energy and exergy based performances. Thermodynamics properties of binary mixture of [EMIM] [DMP]-H 2 O like Dühring's (P-T-x1) and h-T-X1 plots are computed from the activity coefficient based non-random two-liquid model (NRTL) model. Further modeling and simulation of VACs are accomplished in open source Scilab as mathematical programing software and used to ascertain the optimal generator temperature established on energetic and exergetic COP. Optimal results include an extensive range of temperatures like T e from 2.5 to 15 C and T a and T c from 30 to 45 C. Simulation of the single effect VAC with SHE by using [EMIM][DMP]-H 2 O mixture at T e = 10 C, T g = 100 C, T a = 30 C, and T c = 40 C were evaluated and compared with the 5 working fluids. Simulation outcomes depicted greater COP of 0.82 for [EMIM][DMP]-H 2 O in comparison with NH 3-H 2 O, EMISE-H 2 O, [EMIM][BF4]-H 2 O and nearly equal to LiBr-H 2 O (COP = 0.83). In addition, the effect of T g on the COP, ECOP f , and composition are compared and optimized for the evaporation temperature range from 2.5 to 15 C, T a /T c from 30 to 45 C and cooling water (CW) flow in series and parallel. Additionally, the optimal T g exhibited distinction based on energy and exergy analysis. Thus, it resulted in optimized performances of [EMIM] [DMP]-H 2 O that can be suitable to replace corrosive aqueous LiBr in VACs.

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“…These systems employ a mixture of two fluids (namely, refrigerant and absorbent) with different volatilities as working fluids. Absorption systems using natural refrigerants (mainly H 2 O, NH 3 , CO 2 ) and ILs as absorbent have been extensively studied [8][9][10][11][12]. Considering that there is an infinity of anion and cation combinations for potential ionic liquids, the screening of the ILs as working fluids is critically important.…”

Section: Introductionmentioning

confidence: 99%

“…A lower value of the excess Gibbs energy means that there is a high chemical affinity of IL for a given refrigerant. Cera-Manjarres et al [8] used the g E -x relationship and the deviation from Raoult's law for selecting the most suitable IL absorbent for ammonia. Among the investigated ILs, ionic liquid 1-(2-hydroxyethyl)-3methylimidazolium tetrafluoroborate [EtOHmim][BF4] was selected as the most suitable.…”

Section: Introductionmentioning

confidence: 99%

Experimental determination and predictive modelling of the mutual diffusion coefficients of water and ionic liquid 1-(2-hydroxyethyl)-3-methylimidazolium tetrafluoroborate

Rives

Mialdun

Yasnou

et al. 2019

Journal of Molecular Liquids

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Mutual diffusion coefficients of a binary mixture of water + ionic liquid 1-(2-hydroxyethyl)-3methylimidazolium tetrafluoroborate have been investigated by means of experimental and predictive approaches. Optical digital interferometry has been employed to determine the mutual diffusion coefficients over the full ionic liquid mass fraction range and at four temperatures between 298.15 and 313.15 K. Moreover, the prediction ability of four different models has been tested. The influence of using different excess Gibbs energy (g E ) models to calculate the relevant thermodynamics properties was also addressed. The mutual diffusion coefficient has a strong dependence on concentration and varies from 2 × 10 −10 to 1.27 × 10 −9 m 2 s −1 . The concentration and temperature dependencies of the present experimental diffusion coefficients were correlated using empirical and predictive equations. The use of binary interaction parameter regressed from diffusion data instead of vapor-liquid equilibria improves considerably the prediction ability of the employed predictive models. Among the studied predictive models, the modified group contribution model provides the best results with an absolute relative deviation of 2.1%. Throughout the paper, thermodynamic and kinetic behavior of the mixture are analyzed for establishing an appropriate criterion for the screening of ionic liquids as working fluids for absorption refrigeration systems.

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Vapour pressure measurements of ammonia/ionic liquids mixtures as suitable alternative working fluids for absorption refrigeration technology

Cited by 53 publications

References 57 publications

Exploring the Gas-Permeation Properties of Proton-Conducting Membranes Based on Protic Imidazolium Ionic Liquids: Application in Natural Gas Processing

Exploring the Gas-Permeation Properties of Proton-Conducting Membranes Based on Protic Imidazolium Ionic Liquids: Application in Natural Gas Processing

Thermodynamic properties and performance evaluation of [EMIM] [DMP]‐H ₂ O working pair for absorption cooling cycle

Experimental determination and predictive modelling of the mutual diffusion coefficients of water and ionic liquid 1-(2-hydroxyethyl)-3-methylimidazolium tetrafluoroborate

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Vapour pressure measurements of ammonia/ionic liquids mixtures as suitable alternative working fluids for absorption refrigeration technology

Cited by 53 publications

References 57 publications

Exploring the Gas-Permeation Properties of Proton-Conducting Membranes Based on Protic Imidazolium Ionic Liquids: Application in Natural Gas Processing

Exploring the Gas-Permeation Properties of Proton-Conducting Membranes Based on Protic Imidazolium Ionic Liquids: Application in Natural Gas Processing

Thermodynamic properties and performance evaluation of [EMIM] [DMP]‐H 2 O working pair for absorption cooling cycle

Experimental determination and predictive modelling of the mutual diffusion coefficients of water and ionic liquid 1-(2-hydroxyethyl)-3-methylimidazolium tetrafluoroborate

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Thermodynamic properties and performance evaluation of [EMIM] [DMP]‐H ₂ O working pair for absorption cooling cycle