DMSO/IL solvent systems for cellulose dissolution: binary or ternary mixtures?

Hydrophobic, long-chain tetraalkylphosphonium acetate salts (ionic liquids) were combined with DMSO and the feasibility of these solvent systems for cellulose dissolution and regeneration was studied.

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Dielectric Properties of 1-Hexanol in Mesitylene Solution on Admixture of Aromatic Dihydric Alcohols

Zeitschrift für Naturforschung A ◽

10.1515/zna-1994-0309 ◽

1994 ◽

Vol 49 (3) ◽

pp. 503-510

Author(s):

G. Turky ◽

F. F. Hanna ◽

G. Klages ◽

A. Ghoneim ◽

M. Stockhausen

Keyword(s):

Polar Solvent ◽

Alcohol Concentration ◽

Ternary Mixtures ◽

Dihydric Alcohol ◽

Pure Alcohol ◽

Mean Lifetime ◽

Solvent Systems ◽

The Mean ◽

Frequency Relaxation ◽

Association Effect

Abstract Broadband dielectric relaxation spectra (at 20 to 40 °C) are reported for three liquid alcohol/non polar solvent systems: Binary hexanol/mesitylene mixtures and two corresponding ternary mixtures, where 5 percent of hexanol are replaced by a dihydric alcohol, namely resorcinol (1,3-dihydroxyben zene) or 2,2´-dihydroxydiphenyl. The concentration of the polar substance(s) ranges from dilute solutions to pure alcohol(s). The lower frequency relaxation contribution, which generally is the more dominating the higher the alcohol concentration, is additionally enhanced by the diol admixture in the case of low and moderate concentrations. This can be understood as a hetero-association effect, the diol molecules playing a bridging role, which also leads to an increase in the mean lifetime of associated states.

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Utilization of Cellulose to Its Full Potential: A Review on Cellulose Dissolution, Regeneration, and Applications

Polymers ◽

10.3390/polym13244344 ◽

2021 ◽

Vol 13 (24) ◽

pp. 4344

Author(s):

Sanjit Acharya ◽

Sumedha Liyanage ◽

Prakash Parajuli ◽

Shaida Sultana Rumi ◽

Julia L. Shamshina ◽

...

Keyword(s):

Hydrophobic Interactions ◽

Structural Characteristics ◽

Synthetic Polymers ◽

Chemical Processing ◽

Full Potential ◽

Cellulose Dissolution ◽

Natural Polymer ◽

Mechanistic Studies ◽

Solvent Systems ◽

Subsequent Regeneration

As the most abundant natural polymer, cellulose is a prime candidate for the preparation of both sustainable and economically viable polymeric products hitherto predominantly produced from oil-based synthetic polymers. However, the utilization of cellulose to its full potential is constrained by its recalcitrance to chemical processing. Both fundamental and applied aspects of cellulose dissolution remain active areas of research and include mechanistic studies on solvent–cellulose interactions, the development of novel solvents and/or solvent systems, the optimization of dissolution conditions, and the preparation of various cellulose-based materials. In this review, we build on existing knowledge on cellulose dissolution, including the structural characteristics of the polymer that are important for dissolution (molecular weight, crystallinity, and effect of hydrophobic interactions), and evaluate widely used non-derivatizing solvents (sodium hydroxide (NaOH)-based systems, N,N-dimethylacetamide (DMAc)/lithium chloride (LiCl), N-methylmorpholine-N-oxide (NMMO), and ionic liquids). We also cover the subsequent regeneration of cellulose solutions from these solvents into various architectures (fibers, films, membranes, beads, aerogels, and hydrogels) and review uses of these materials in specific applications, such as biomedical, sorption, and energy uses.

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Novel solvent systems for cellulose dissolution

BioResources ◽

10.15376/biores.16.2.2192-2195 ◽

2021 ◽

Vol 16 (2) ◽

pp. 2192-2195

Author(s):

Jianbo Shuai ◽

Xiaohui Wang

Keyword(s):

Environmental Economic ◽

Functional Materials ◽

Industrial Applications ◽

Biodegradable Materials ◽

Cellulose Dissolution ◽

Solvent Systems ◽

Cellulose Solvents ◽

Plastic Products ◽

The Ideal

Cellulose, as the most abundant sustainable resource on earth, can be chemically transformed into a variety of biodegradable materials, which have been proposed as the ideal substitutes for plastic products. The first challenge for the fabrication of cellulose-based functional materials is the successful dissolution of cellulose by solvents. However, most existing cellulose solvents have environmental, economic, and other drawbacks that limit their further industrial applications. Research on developing novel solvent systems with “greener” and “cheaper” properties is needed to meet the challenges.

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Assessing cellulose dissolution efficiency in solvent systems based on a robust experimental quantification protocol and enthalpy data

Holzforschung ◽

10.1515/hf-2019-0086 ◽

2019 ◽

Vol 73 (12) ◽

pp. 1103-1112 ◽

Cited By ~ 6

Author(s):

Marc Kostag ◽

Marcella Teixeira Dignani ◽

Matheus Costa Lourenço ◽

Thaís de Almeida Bioni ◽

Omar A. El Seoud

Keyword(s):

Mole Fraction ◽

Ammonium Fluoride ◽

Titration Calorimetry ◽

Cellulose Dissolution ◽

Solvent Interactions ◽

Mechanical Stirring ◽

Ether Oxygen ◽

Solvent Systems ◽

Dissolution Efficiency ◽

Enthalpy Data

Abstract Dissolution of microcrystalline cellulose (MCC) in pure ionic liquids (ILs) and IL/dimethyl sulfoxide (DMSO) mixtures (mole fraction χDMSO = 0.2–0.9) was quantified using a specially constructed mechanical stirring system that allows reproducible agitation speed; temperature control, and minimum solution-air contact. The electrolytes employed were: 1-(n-butyl)-3-methylimidazolium acetate (C4MeIm AcO), 1-(methoxyethyl)-3-methylimidazolium acetate (C3OMeIm AcO), 1,8-diazabicyclo[5.4.0]undec-7-enium acetate (DBU AcO), tetramethylguanidinium acetate (TMG AcO), and tetra(n-butyl)ammonium fluoride hydrate (TBAF·xH2O). The effects on MCC dissolution of IL/DMSO composition, and temperature (50, 70°C) were studied. C4MeIm AcO and C4MeIm AcO/DMSO were more efficient solvents than their C3OMeIm AcO counterparts, due to “deactivation” of the ether oxygen of C3OMeIm AcO. MCC dissolution by C4MeIm AcO/DMSO was compared with DBU AcO/DMSO, TMG AcO/DMSO at χDMSO = 0.6, and TBAF·xH2O/DMSO at χDMSO = 0.95. The relative efficiency was (solutions in DMSO): C4MeIm AcO > C3OMeIm AcO > DBU AcO > TMG AcO > TBAF·xH2O. The efficiency of C4MeIm AcO relative to C3OMeIm AcO is due to higher solution basicity. Isothermal titration calorimetry was used to study cellobiose-solvent interactions. Except for TBAF·xH2O/DMSO, these interactions are exothermic; the relative solvent efficiency increases with increasing dissolution |enthalpy|. Using the mole fraction concentration scale to report cellulose dissolution avoids possible ambiguities.

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Fine regulation of cellulose dissolution and regeneration by low pressure CO2 in DMSO/organic base: dissolution behavior and mechanism

Physical Chemistry Chemical Physics ◽

10.1039/c6cp05541a ◽

2016 ◽

Vol 18 (48) ◽

pp. 32772-32779 ◽

Cited By ~ 15

Author(s):

Jinfang Wang ◽

Zhimin Xue ◽

Chuanyu Yan ◽

Zhonghao Li ◽

Tiancheng Mu

Keyword(s):

Low Pressure ◽

Dissolution Behavior ◽

Cellulose Dissolution ◽

Organic Base ◽

Fine Regulation ◽

Solvent Systems

Exploring cellulose dissolving and regenerating behavior in DMSO/organic base solvent systems with the activation of low pressure CO2.

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Hydrogen-Bonded Solvent Systems

Zeitschrift für Physikalische Chemie ◽

10.1524/zpch.1969.67.1_3.168 ◽

1969 ◽

Vol 67 (1_3) ◽

pp. 168-168

Author(s):

H. G. Hertz

Keyword(s):

Solvent Systems ◽

Hydrogen Bonded

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VANILLINSÄURE ALS ENDPRODUKT DES STOFFWECHSELS VON ADRENALIN UND NORADRENALIN. II.

Acta Endocrinologica ◽

10.1530/acta.0.0440101 ◽

1963 ◽

Vol 44 (1) ◽

pp. 101-106 ◽

Cited By ~ 4

Author(s):

Wilhelm Dirscherl ◽

Helmut Thomas

Keyword(s):

Rat Liver ◽

Paper Chromatography ◽

Column Chromatography ◽

Vanillic Acid ◽

Hippuric Acid ◽

Single Spot ◽

Solvent Systems ◽

Perfusion Experiment ◽

Kinetics Of

ABSTRACT Perfusion of rat liver with vanillic acid yielded only one metabolite. In paper chromatography with three different solvent systems, the substance showed the same RF-values as vanillyolglycine (3-methoxy-4-hydroxyhippuric acid) and in mixed chromatograms there was only one single spot. After separation by column chromatography, the UV- and IRspectra of the reaction product were identical with those of 3-methoxy4-hydroxy-hippuric acid. During the perfusion experiment, the kinetics of the conjugation were investigated.

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Energy saving technology for sintering of black bricks from high-siliceous clay

MRS Advances ◽

10.1557/adv.2020.369 ◽

2020 ◽

Vol 5 (61) ◽

pp. 3123-3131

Author(s):

Mario Flores Nicolas ◽

Marina Vlasova ◽

Pedro Antonio Márquez Aguilar ◽

Mykola Kakazey ◽

Marcos Mauricio Chávez Cano ◽

...

Keyword(s):

Low Temperature ◽

Oxygen Deficiency ◽

Glass Ceramics ◽

Total Content ◽

Ceramic Materials ◽

Ternary Mixtures ◽

High Porosity ◽

Reducing Conditions ◽

Binary And Ternary Mixtures ◽

Dark Color

AbstractThe low-temperature synthesis of bricks prepared from high-siliceous clays by the method of plastic molding of blanks was used. For the preparation of brick blanks, binary and ternary mixtures of high-siliceous clays, black sand, and bottle glass cullet were used. Gray-black low-porosity and high-porosity ceramics was obtained by sintering under conditions of oxygen deficiency. It has been established that to initiate plastic in mixtures containing high-siliceous clay, it is necessary to add montmorillonite/bentonite additives, carry out low-temperature sintering, and introduce low-melting glass additives with a melting point ranging from 750 to 800 °C. The performed investigations have shown that the sintering of mixtures with a total content of iron oxide of about 5 wt% under reducing conditions at Tsint. = 800°C for 8 h leads to the formation of glass ceramics consisting of quartz, feldspars, and a phase. The main sources of the appearance of a dark color is the formation of [Fe3+O4]4- and [Fe3+O6]9- anions in the composition of the glass phase and feldspars. By changing the contents of clay, sand, and glass in sintering, it is possible to obtain two types of ceramic materials: (a) in the form of building bricks and (b) in the form of porous fillers.

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