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Title: Melting point depression effect with CO2 in high melting temperature cellulose dissolving ionic liquids. Modeling with group contribution equation of state
Authors: Lopes, Joana
Sánchez, Francisco A
Rodríguez-Reartes, S Belén
Bermejo Roda, Mª Dolores
Martín Martínez, Ángel
Cocero Alonso, María José
Issue Date: 2016
Publisher: Elsevier B.V.
Description: Producción Científica
Citation: The Journal of Supercritical Fluids Volume 107, January 2016, Pages 590-604
Abstract: Ionic liquids of the alkylmethylimidazolium chloride family are able to solubilize high amount of cellulose and other natural polymers and have very good characteristics for their processing. Nevertheless, they present important disadvantages related to their high melting points and viscosities. Dissolution of carbon dioxide (CO2) can reduce the melting point of these ionic liquids as well as other ones presenting the same problems. In this work, the effect of pressurized carbon dioxide on the melting point depression of some ionic liquids able to dissolve biopolymers was experimentally determined using the first melting point method. Five different ionic liquids were studied in contact with CO2 using a high-pressure visual cell, up to a pressure of 10 MPa. The ILs studied were four ionic liquids with chloride anion coupled with the cations: 1-butyl-3-methylimidazolium, [C4mim]+, 1-ethyl-3-methylimidazolium, [C2mim]+, 1-allyl-3-methylimidazolium, [Amim]+ and 1-(2-hydroxyethyl)-3-methylimidazolium, [C2OHmim]+ and one ammonium-based cation choline [C5H14NO]+ combined with dihydrogen phosphate anion, [H2PO4]−. Melting point depression effect observed for these groups of ionic liquids were around 10 K for chloride ILs and went as high as 33.2 K for choline dihydrogen phosphate. To correlate the melting point depression of imidazolium chloride ILs, parameters for the Group Contribution Equation of State (GC-EoS) of Skjold-Jørgensen for the liquid phase plus a fugacity expression for solid phases was employed. Experimental data used for the parameterization includes literature data of binary vapor–liquid, liquid–liquid and solid–liquid equilibria, and activity coefficients at infinite dilution. Melting point depression was calculated with an average deviation of 1.7 K (0.5%) and a maximum deviation of 4.3 K (1.3%).
Keywords: propiedades térmicas
Thermal properties
Classification: Ionic Liquid
Carbon Dioxide
Melting Point Depression
Imidazolium Chlride
Group Contribution
ISSN: 0896-8446
Peer Review: SI
DOI: 10.1016/j.supflu.2015.07.021
Sponsor: Junta de Castilla y León VA295U14
Marie Curie Program. Project DoHip
Ministerio de Economía. Programa Ramon y Cajal, RyC RYC-2013-13976
Consejo Nacional de Investigaciones Cientí- ficas y Técnicas (CONICET)
Universidad Nacional del Sur (UNS)
Ministerio de Ciencia, Tecnología e Innovación Productiva (MinCyT)
Ministry (MINECO) Proyecto CTQ 2011-14825-E (Programa Explora)
Publisher Version:
Rights Owner: Elsevier B.V.
Language: eng
Rights: info:eu-repo/semantics/embargoedAccess
Appears in Collections:IPP - Artículos de revista

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