Viscosity reduction of cellulose + 1-butyl-3-methylimidazolium acetate in the presence of CO2

Iguchi, Masayuki; Kasuya, Kazuhiro; Satō, Yoshiyuki; Aida, Taku Michael; Watanabe, Masaru; Smith, Richard L.

doi:10.1007/s10570-013-9884-8

Cited by 23 publications

(16 citation statements)

References 44 publications

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“…The results of Hiraga et al lie between 5 and 7% above those of this work, in the common temperature range, slightly above the combined relative uncertainty of ±(3–4)%. These authors state that these results are to be preferred to their earlier measurements made on a 95% Aldrich sample . The results of Haghtalab and Shojaeian, precision given as ±0.4%, are in surprisingly good agreement given the very high water content of their sample, 10 6 × w = 13 000 and the low overall purity (∼95%, Aldrich), but those of Kanakubo et al and of Safarov et al, also for Aldrich samples of similar purity, uncertainty ±2%, and consistent with one another, are much higher than this work, at 10–30% (10 6 × w = 3500 and 300, respectively, both vacuum dried).…”

Section: Discussionmentioning

confidence: 61%

Temperature and Pressure Dependence of the Viscosity of the Ionic Liquid 1-Butyl-3-methylimidazolium Acetate

Harris

2020

J. Chem. Eng. Data

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Viscosities obtained with a falling-body viscometer are reported at pressures up to 300 MPa, over the temperature range 278–353 K, for 1-butyl-3-methylimidazolium acetate ([BMIM][Ac]) samples dried under high vacuum with water content [106 × w(H2O) = 258 and 1180] and ion purity x > 0.992. Atmospheric pressure densities are reported for 273–363 K. Comparison is made with literature viscosities and densities at 0.1 MPa. There is a very large variation in the former, which seems in part due to differences in the purities of the source materials. It is recommended that methanol-free reagents should be used for Karl Fischer water analysis of ionic liquid acetates and that samples used for thermophysical property measurements should be well characterized by spectroscopic methods, not just water content. The proton resonance at the C2 position on the imidazolium ring appears to be a good qualitative indication of the dryness. “Activation” volumes, ΔV ‡, are calculated from the parameters of a fit to a pressure-modified Vogel–Fulcher–Tamman (VFT) equation and compared with those for other 1-butyl-3-methylimidazolium ionic liquids. Thermodynamic or density scaling has been applied to the reduced viscosity as a function of the group (TV γ), γ being the single scaling parameter, equal to 2.02.

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Section: Discussionmentioning

confidence: 61%

Temperature and Pressure Dependence of the Viscosity of the Ionic Liquid 1-Butyl-3-methylimidazolium Acetate

Harris

2020

J. Chem. Eng. Data

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“…The effect of CO 2 in IL + cellulose mixtures was only studied by Iguchi et al [128], with and acetate anion IL, using low concentrations of cellulose to avoid its precipitation with CO 2 . At 4 MPa and 39 • C, viscosity can be reduced of 1.2 wt % cellulose + [Bmim]OAc solution by about 80%.…”

Section: Viscosity Of Concentrated Cellulose Solutions In Ilsmentioning

confidence: 99%

Ionic Liquid as Reaction Media for the Production of Cellulose-Derived Polymers from Cellulosic Biomass

et al. 2017

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Abstract:The most frequent polymer on nature is cellulose that is present together with lignin and hemicellulose in vegetal biomass. Cellulose can be, in the future, sustainable raw matter for chemicals, fuels, and materials. Nevertheless, only 0.3% of cellulose is processed nowadays due to the difficulty in dissolving it, and only a small proportion is used for the production of synthetic cellulosic fibers especially esters and other cellulose derivatives, normally in extremely polluting processes. The efficient and clean dissolution of cellulose is a major objective in cellulose research and development. Ionic liquids (ILs) are considered "green" solvents due to their low vapor pressure, that prevents them evaporating into the atmosphere. In addition, these molten salts present advantages in process intensification, leading to more than 70 patents in lignocellulosic biomass in ILs being published since 2005, most of them related to the production of cellulose derived polymers, e.g., acetates, benzoylates, sulfates, fuorates, phthalates, succinates, tritylates, or silylates. In this work, the use of ILs for production of cellulose derived polymers is thoroughly studied. To do so, in the first place, a brief summary of the state of the art in cellulose derivatives production is presented, as well as the main features of ILs in cellulose processing applications. Later, the main results in the production of cellulose derivatives using ILs are presented, followed by an analysis of the industrial viability of the process, considering aspects such as environmental concerns and ILs' recyclability.

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“…The addition of a co-solvent induces an exponential decrease of the viscosity of the polymer solutions as recently observed for DMSO 21 or carbon dioxide. 22 Because mass transfer is improved, the temperature at which the dissolution of a given concentration of polymer is observed might be lower. This should constitute an advantage in terms of recyclability when using ionic liquids such as 1-butyl-3-methylimidazolium acetate, [C 4 C 1 Im][OAc], which decomposes by 1% within 10 h at 102 °C.…”

Section: Introductionmentioning

confidence: 99%

Understanding the role of co-solvents in the dissolution of cellulose in ionic liquids

et al. 2014

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Viscosity reduction of cellulose + 1-butyl-3-methylimidazolium acetate in the presence of CO2

Cited by 23 publications

References 44 publications

Temperature and Pressure Dependence of the Viscosity of the Ionic Liquid 1-Butyl-3-methylimidazolium Acetate

Temperature and Pressure Dependence of the Viscosity of the Ionic Liquid 1-Butyl-3-methylimidazolium Acetate

Ionic Liquid as Reaction Media for the Production of Cellulose-Derived Polymers from Cellulosic Biomass

Understanding the role of co-solvents in the dissolution of cellulose in ionic liquids

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