1
|
Asensio-Delgado S, Pardo F, Zarca G, Urtiaga A. Machine learning for predicting the solubility of high-GWP fluorinated refrigerants in ionic liquids. J Mol Liq 2022. [DOI: 10.1016/j.molliq.2022.120472] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
|
2
|
Langtry AE, Thompson KB, Redeker ND, Quintana AS, Bui DL, Greeson KT, Cena N, Marcischak JC, M. J. Moore L, Ghiassi KB. Fluorinated phosphonium salts and ionic liquids prepared via thiol-ene click chemistry: a physical and thermal property study. J Mol Liq 2022. [DOI: 10.1016/j.molliq.2022.119282] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
|
3
|
|
4
|
Alkhatib III, Albà CG, Darwish AS, Llovell F, Vega LF. Searching for Sustainable Refrigerants by Bridging Molecular Modeling with Machine Learning. Ind Eng Chem Res 2022; 61:7414-7429. [PMID: 35673400 PMCID: PMC9165071 DOI: 10.1021/acs.iecr.2c00719] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/03/2022] [Revised: 04/30/2022] [Accepted: 05/06/2022] [Indexed: 11/29/2022]
Abstract
![]()
We present here a
novel integrated approach employing machine learning
algorithms for predicting thermophysical properties of fluids. The
approach allows obtaining molecular parameters to be used in the polar
soft-statistical associating fluid theory (SAFT) equation of state
using molecular descriptors obtained from the conductor-like screening
model for real solvents (COSMO-RS). The procedure is used for modeling
18 refrigerants including hydrofluorocarbons, hydrofluoroolefins,
and hydrochlorofluoroolefins. The training dataset included six inputs
obtained from COSMO-RS and five outputs from polar soft-SAFT parameters,
with the accurate algorithm training ensured by its high statistical
accuracy. The predicted molecular parameters were used in polar soft-SAFT
for evaluating the thermophysical properties of the refrigerants such
as density, vapor pressure, heat capacity, enthalpy of vaporization,
and speed of sound. Predictions provided a good level of accuracy
(AADs = 1.3–10.5%) compared to experimental data, and within
a similar level of accuracy using parameters obtained from standard
fitting procedures. Moreover, the predicted parameters provided a
comparable level of predictive accuracy to parameters obtained from
standard procedure when extended to modeling selected binary mixtures.
The proposed approach enables bridging the gap in the data of thermodynamic
properties of low global warming potential refrigerants, which hinders
their technical evaluation and hence their final application.
Collapse
Affiliation(s)
- Ismail I I Alkhatib
- Research and Innovation Center on CO2 and Hydrogen (RICH), Khalifa University, PO Box 127788 Abu Dhabi, United Arab Emirates.,Chemical Engineering Department, Khalifa University, PO Box 127788 Abu Dhabi, United Arab Emirates
| | - Carlos G Albà
- Department of Chemical Engineering, ETSEQ, Universitat Rovira i Virgili (URV), Avinguda Països Catalans 26, 43007 Tarragona, Spain
| | - Ahmad S Darwish
- Chemical Engineering Department, Khalifa University, PO Box 127788 Abu Dhabi, United Arab Emirates
| | - Fèlix Llovell
- Department of Chemical Engineering, ETSEQ, Universitat Rovira i Virgili (URV), Avinguda Països Catalans 26, 43007 Tarragona, Spain
| | - Lourdes F Vega
- Research and Innovation Center on CO2 and Hydrogen (RICH), Khalifa University, PO Box 127788 Abu Dhabi, United Arab Emirates.,Chemical Engineering Department, Khalifa University, PO Box 127788 Abu Dhabi, United Arab Emirates
| |
Collapse
|
5
|
Purcell SM, Lane PD, D'Andrea L, Elstone NS, Bruce DW, Slattery JM, Smoll EJ, Greaves SJ, Costen ML, Minton TK, McKendrick KG. Surface Structure of Alkyl/Fluoroalkylimidazolium Ionic-Liquid Mixtures. J Phys Chem B 2022; 126:1962-1979. [PMID: 35225614 PMCID: PMC9007465 DOI: 10.1021/acs.jpcb.1c10460] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/19/2023]
Abstract
The gas-liquid interface of ionic liquids (ILs) is critically important in many applications, for example, in supported IL phase (SILP) catalysis. Methods to investigate the interfacial structure in these systems will allow their performance to be improved in a rational way. In this study, reactive-atom scattering (RAS), surface tension measurements, and molecular dynamics (MD) simulations were used to study the vacuum interface of mixtures of partially fluorinated and normal alkyl ILs. The underlying aim was to understand whether fluorinated IL ions could be used as additives to modify the surface structure of one of the most widely used families of alkyl ILs. The series of ILs 1-alkyl-3-methylimidazolium bis(trifluoromethylsulfonyl)imide ([Cnmim][Tf2N]) with n = 4-12 were mixed with a fixed-length, semiperfluorinated analogue (1H,1H,2H,2H-perfluorooctyl)-3-methylimidazolium bis(trifluoromethylsulfonyl)imide ([C8mimF13][Tf2N]), forming [Cnmim](1-x)[C8mimF13]x[Tf2N] mixtures, where x is the bulk mole fraction of the fluorinated component. The RAS-LIF method combined O-atom projectiles with laser-induced fluorescence (LIF) detection of the product OH as a measure of surface exposure of the alkyl chains. For [C8mim](1-x)[C8mimF13]x[Tf2N] mixtures, RAS-LIF OH yields are below those expected from stoichiometry. There are quantitatively consistent negative deviations from linearity of the surface tension. Both results imply that the lower-surface-tension fluoroalkyl material dominates the surface. A similar deficit is found for alkyl chain lengths n = 4, 6, 8, and 12 and for all (nonzero) x investigated by RAS-LIF. Accessible-surface-area (ASA) analyses of the MD simulations for [Cnmim](1-x)[C8mimF13]x[Tf2N] mixtures qualitatively reproduce the same primary effect of fluoro-chain predominance of the surface over most of the range of n. However, there are significant quantitative discrepancies between MD ASA predictions and experiment relating to the strength of any n-dependence of the relative alkyl coverage at fixed x, and on the x-dependence at fixed n. These discrepancies are discussed in the context of detailed examinations of the surface structures predicted in the MD simulations. Potential explanations, beyond experimental artifacts, include inadequacies in the classical force fields used in the MD simulations or the inability of simple ASA algorithms to capture dynamical factors that influence RAS-LIF yields.
Collapse
Affiliation(s)
- Simon M Purcell
- Institute of Chemical Sciences, School of Engineering and Physical Sciences, Heriot-Watt University, Edinburgh EH14 4AS, U.K
| | - Paul D Lane
- Institute of Chemical Sciences, School of Engineering and Physical Sciences, Heriot-Watt University, Edinburgh EH14 4AS, U.K
| | - Lucía D'Andrea
- Department of Chemistry, University of York, Heslington, York YO10 5DD, U.K
| | - Naomi S Elstone
- Department of Chemistry, University of York, Heslington, York YO10 5DD, U.K
| | - Duncan W Bruce
- Department of Chemistry, University of York, Heslington, York YO10 5DD, U.K
| | - John M Slattery
- Department of Chemistry, University of York, Heslington, York YO10 5DD, U.K
| | - Eric J Smoll
- Department of Chemistry and Biochemistry, Montana State University, Bozeman, Montana 59717, United States
| | - Stuart J Greaves
- Institute of Chemical Sciences, School of Engineering and Physical Sciences, Heriot-Watt University, Edinburgh EH14 4AS, U.K
| | - Matthew L Costen
- Institute of Chemical Sciences, School of Engineering and Physical Sciences, Heriot-Watt University, Edinburgh EH14 4AS, U.K
| | - Timothy K Minton
- Ann and H.J. Smead Department of Aerospace Engineering Sciences, University of Colorado Boulder, Boulder, Colorado 80303, United States
| | - Kenneth G McKendrick
- Institute of Chemical Sciences, School of Engineering and Physical Sciences, Heriot-Watt University, Edinburgh EH14 4AS, U.K
| |
Collapse
|
6
|
Alkhatib II, Galindo A, Vega LF. Systematic study of the effect of the co-solvent on the performance of amine-based solvents for CO2 capture. Sep Purif Technol 2022. [DOI: 10.1016/j.seppur.2021.120093] [Citation(s) in RCA: 6] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022]
|
7
|
Jovell D, Pou JO, Llovell F, Gonzalez-Olmos R. Life Cycle Assessment of the Separation and Recycling of Fluorinated Gases Using Ionic Liquids in a Circular Economy Framework. ACS SUSTAINABLE CHEMISTRY & ENGINEERING 2022; 10:71-80. [PMID: 35036177 PMCID: PMC8753992 DOI: 10.1021/acssuschemeng.1c04723] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 07/13/2021] [Revised: 12/01/2021] [Indexed: 06/14/2023]
Abstract
The stricter regulation regarding the use of fluorinated gases (F-gases), as a consequence of their high Global Warming Potential (GWP), represents a challenge for the refrigeration industry. The design of alternatives requires the recycling of the low to moderate GWP compounds from current refrigerant blends. However, there is not a developed and standardized technology available to recover them, and once the life cycle of the refrigeration equipment has ended, most gases are incinerated. Fluorinated ionic liquids (FILs) can effectively perform as absorbents to the complex separation of F-gas mixtures. In this work, a methodology based on the COSMO-RS thermodynamic package integrated into an Aspen Plus process simulator was used to evaluate the performance of an FIL to recover difluoromethane (R-32) from the commercial blend R-407F. The environmental sustainability of the recovery process (circular economy scenario) was analyzed with a life cycle assessment (LCA) approach, comparing the obtained results with the conventional R-32 production (benchmark scenario). The results reveal a 30% recovery of 98 wt % R-32 suitable for further reuse with environmental load reduction in the 86-99% range compared to the R-32 production. This study can guide the development of new F-gas recovery technologies to improve the environmental impacts of these compounds from a circular economy perspective.
Collapse
Affiliation(s)
- Daniel Jovell
- Department
of Chemical Engineering and Materials Science, IQS School of Engineering, Universitat Ramon Llull, Via Augusta 390, 08017 Barcelona, Spain
| | - Josep O. Pou
- Department
of Chemical Engineering and Materials Science, IQS School of Engineering, Universitat Ramon Llull, Via Augusta 390, 08017 Barcelona, Spain
| | - Fèlix Llovell
- Department
of Chemical Engineering, Universitat Rovira
i Virgili, Avinguda Països Catalans 26, 43007 Tarragona, Spain
| | - Rafael Gonzalez-Olmos
- Department
of Chemical Engineering and Materials Science, IQS School of Engineering, Universitat Ramon Llull, Via Augusta 390, 08017 Barcelona, Spain
| |
Collapse
|
8
|
Alkhatib III, Vega LF. Quantifying the effect of polar interactions on the behavior of binary mixtures: Phase, interfacial, and excess properties. J Chem Phys 2021; 154:164503. [PMID: 33940796 DOI: 10.1063/5.0046034] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/30/2022] Open
Abstract
In this work, polar soft-Statistical Associating Fluid Theory (SAFT) was used in a systematic manner to quantify the influence of polar interactions on the phase equilibria, interfacial, and excess properties of binary mixtures. The theory was first validated with available molecular simulation data and then used to isolate the effect of polar interactions on the thermodynamic behavior of the mixtures by fixing the polar moment of one component while changing the polar moment of the second component from non-polar to either highly dipolar or quadrupolar, examining 15 different binary mixtures. It was determined that the type and magnitude of polar interactions have direct implications on the vapor-liquid equilibria (VLE), resulting in azeotropy for systems of either dipolar or quadrupolar fluids when mixed with non-polar or low polar strength fluids, while increasing the polar strength of one component shifts the VLE to be more ideal. Additionally, excess properties and interfacial properties such as interfacial tension, density profiles, and relative adsorption at the interface were also examined, establishing distinct enrichment in the case of mixtures with highly quadrupolar fluids. Finally, polar soft-SAFT was applied to describe the thermodynamic behavior of binary mixtures of experimental systems exhibiting various intermolecular interactions (non-polar and polar), not only demonstrating high accuracy and robustness through agreement with experimental data but also providing insights into the effect of polarity on the interfacial properties of the studied mixtures. This work proves the value of having an accurate theory for isolating the effect of polarity, especially for the design of ad hoc polar solvents.
Collapse
Affiliation(s)
- Ismail I I Alkhatib
- Chemical Engineering Department, Khalifa University of Science and Technology, P.O. Box 127788, Abu Dhabi, United Arab Emirates
| | - Lourdes F Vega
- Chemical Engineering Department, Khalifa University of Science and Technology, P.O. Box 127788, Abu Dhabi, United Arab Emirates
| |
Collapse
|
9
|
Asensio-Delgado S, Pardo F, Zarca G, Urtiaga A. Enhanced absorption separation of hydrofluorocarbon/hydrofluoroolefin refrigerant blends using ionic liquids. Sep Purif Technol 2020. [DOI: 10.1016/j.seppur.2020.117136] [Citation(s) in RCA: 19] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
|
10
|
|
11
|
Silva GM, Justino J, Morgado P, Teixeira M, Pereira LM, Vega LF, Filipe EJ. Detailed surface characterization of highly fluorinated liquid alcohols: Experimental surface tensions, molecular simulations and soft-SAFT theory. J Mol Liq 2020. [DOI: 10.1016/j.molliq.2019.112294] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/26/2022]
|
12
|
Alkhatib III, Pereira LMC, Torne J, Vega LF. Polar soft-SAFT: theory and comparison with molecular simulations and experimental data of pure polar fluids. Phys Chem Chem Phys 2020; 22:13171-13191. [DOI: 10.1039/d0cp00846j] [Citation(s) in RCA: 17] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/19/2023]
Abstract
The consideration of polar interactions is of vital importance for the development of predictive and accurate thermodynamic models for polar fluids, as they govern most of their thermodynamic properties, making them highly non-ideal fluids.
Collapse
Affiliation(s)
- Ismail I. I. Alkhatib
- Chemical Engineering Department
- Khalifa University of Science and Technology
- Abu Dhabi
- United Arab Emirates
- Research and Innovation Center on CO2 and H2 (RICH)
| | - Luís M. C. Pereira
- Chemical Engineering Department
- Khalifa University of Science and Technology
- Abu Dhabi
- United Arab Emirates
| | - Jordi Torne
- Alya Technology & Innovation SL
- 08202 Sabadell
- Spain
| | - Lourdes F. Vega
- Chemical Engineering Department
- Khalifa University of Science and Technology
- Abu Dhabi
- United Arab Emirates
- Research and Innovation Center on CO2 and H2 (RICH)
| |
Collapse
|
13
|
Systematic study of the influence of the molecular structure of fluorinated ionic liquids on the solubilization of atmospheric gases using a soft-SAFT based approach. J Mol Liq 2019. [DOI: 10.1016/j.molliq.2019.111645] [Citation(s) in RCA: 15] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/16/2023]
|
14
|
Hermida-Merino C, Pereiro AB, Araújo JMM, Gracia-Fernández C, Vallejo JP, Lugo L, Piñeiro MM. Graphene IoNanofluids, Thermal and Structural Characterization. NANOMATERIALS 2019; 9:nano9111549. [PMID: 31683649 PMCID: PMC6915449 DOI: 10.3390/nano9111549] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 10/01/2019] [Revised: 10/24/2019] [Accepted: 10/28/2019] [Indexed: 01/25/2023]
Abstract
Graphene is considered a promising substance in applications related to the capture and reduction of the environmental impact of fluorinated gases. However, further research is still required to explore all related possibilities. In this work, the potential use in this context of nanofluids (NFs), obtained by dispersing graphene nanosheets in fluorinated ionic liquids (FILs) is investigated. As a starting step, a thermal and structural characterization for this type of IoNanofluids (IoNFs) is presented. The highly nanostructured nature of FILs has been recently demonstrated. The presence of fluorinated moieties is responsible for enhancing the accommodation of solutes such as small gases. The strong tendency to self-assemble forming continuous and supramolecular structures, and the versatility to rearrange in several conformational features allows the stabilization of nano colloidal systems. It is essential to perform a comprehensive study of their structural features to understand the behavior of this type of heterogeneous systems. Therefore, we present screening on the phase and structural behavior of these novel IoNFs to discover and develop optimized systems where FILs turn out to be advantageous. Thermogravimetric analysis (TGA) was employed to evaluate IoNFs mass losses with temperature, and their solid–fluid phase transitions were located using a differential scanning calorimeter (DSC). Their rheological properties were also determined through oscillatory experiments, obtaining the viscous and loss moduli. In addition, the structural percolation transition was also identified.
Collapse
Affiliation(s)
- C Hermida-Merino
- Departamento de Física Aplicada, Facultade de Ciencias, Universidade de Vigo, E36310 Vigo, Spain.
- LAQV, REQUIMTE, Department of Chemistry, Faculdade de Ciências e Tecnologia, Universidade Nova de Lisboa, 2829-516 Caparica, Portugal.
| | - A B Pereiro
- LAQV, REQUIMTE, Department of Chemistry, Faculdade de Ciências e Tecnologia, Universidade Nova de Lisboa, 2829-516 Caparica, Portugal.
| | - J M M Araújo
- LAQV, REQUIMTE, Department of Chemistry, Faculdade de Ciências e Tecnologia, Universidade Nova de Lisboa, 2829-516 Caparica, Portugal.
| | | | - Javier P Vallejo
- Departamento de Física Aplicada, Facultade de Ciencias, Universidade de Vigo, E36310 Vigo, Spain.
| | - Luis Lugo
- Departamento de Física Aplicada, Facultade de Ciencias, Universidade de Vigo, E36310 Vigo, Spain.
| | - M M Piñeiro
- Departamento de Física Aplicada, Facultade de Ciencias, Universidade de Vigo, E36310 Vigo, Spain.
| |
Collapse
|