cellulose activation and dissolution springerlink

(PDF) On the activation of cellulose through xanthation

On the activation of cellulose through xanthation. II. Higher alkali concentration during xanthation favoured the dissolution of cellulose and the formation of the main sulphur byproducts.

(PDF) On the activation of cellulose through xanthation

The variables of cellulose emulsion xanthation were studied in case of using sodium and potassium hydroxide solutions. Potassium hydroxide led to lower dissolution of xanthared cellulose but to Activation of cellulose by 1,4-dioxane for dissolution in Sep 23, 2012 · Abstract. Cellulose (2012) 19:18931906 DOI 10.1007/s10570-012-9779-0 OR IGINAL PAPER Activation of cellulose by 1,4-dioxane for dissolution in N,N-dimethylacetamide/LiCl Vladim´ r Raus Adriana Sturcova ´ Jir ´ Dybal ´ ´ ´ Miroslav Slouf Tatana Vackova Petr Salek Libor Kobera Petr Vlc ek Received:21 December 2011 / Accepted:6 September 2012

Activation of cellulose by 1,4-dioxane for dissolution in

Sep 23, 2012 · Abstract. Cellulose (2012) 19:18931906 DOI 10.1007/s10570-012-9779-0 OR IGINAL PAPER Activation of cellulose by 1,4-dioxane for dissolution in N,N-dimethylacetamide/LiCl Vladim´ r Raus Adriana Sturcova ´ Jir ´ Dybal ´ ´ ´ Miroslav Slouf Tatana Vackova Petr Salek Libor Kobera Petr Vlc ek Received:21 December 2011 / Accepted:6 September 2012 Activation of cellulose by 1,4-dioxane for dissolution in Sep 23, 2012 · Abstract. N,N-Dimethylacetamide/lithium chloride (DMAc/LiCl) mixture is a popular solvent system used for cellulose dissolution, analysis, and derivatization.However, a pre-treatment (activation) procedure is needed for most celluloses to dissolve readily in DMAc/LiCl. Here, an optimized version of the activation protocol based on solvent exchange to 1,4-dioxane was introduced.

Brief overview on cellulose dissolution/regeneration

Aug 01, 2015 · Cellulose is a readily available and renewable biopolymer abundantly found in nature, typically combined with lignin and hemicelluloses in the cell wall of upper parts of plants .This homopolysaccharide is formed by linearly connecting d-glucose units condensed through (14) glycosidic bonds ().The degree of polymerization (DP) can vary considerably depending on the source Brief overview on cellulose dissolution/regeneration Aug 01, 2015 · Cellulose is a readily available and renewable biopolymer abundantly found in nature, typically combined with lignin and hemicelluloses in the cell wall of upper parts of plants .This homopolysaccharide is formed by linearly connecting d-glucose units condensed through (14) glycosidic bonds ().The degree of polymerization (DP) can vary considerably depending on the source

Cellulose Activation and Dissolution Request PDF

Request PDF Cellulose Activation and Dissolution It is well known that controlling the reactions of cellulose, e.g., its transformation into esters or ethers, is not trivial. The products Cellulose Activation and Dissolution Request PDFRequest PDF Cellulose Activation and Dissolution It is well known that controlling the reactions of cellulose, e.g., its transformation into esters or ethers, is not trivial. The products

Cellulose Chemistry and Properties:Fibers, Nanocelluloses

Vincent Bulone et al.:Cellulose sources and new understanding of synthesis in plants Thomas Heinze et al.:Cellulose structure and properties Thomas Rosenau, Antje Potthast, Ute Henniges et al.:Recent developments in cellulose aging (degradation / yellowing / chromophore formation) Sunkyu Park et Cellulose Derivatives - Synthesis, Structure, and Cellulose Activation and Dissolution. Pages 173-257. Heinze, Thomas (et al.) Preview Buy Chapter 3,412. Principles of Cellulose Derivatization. Pages 259-292. Heinze, Thomas (et al.) Preview Buy Chapter 3,412. Cellulose Esters. Pages 293-427. Read this book on SpringerLink

Cellulose Derivatives - Synthesis, Structure, and

Single source of cellulose production, synthesis, dissolution, derivatization and processing Cellulose Activation and Dissolution. Pages 173-257. Read this book on SpringerLink Buy this book eBook 128,39 price for Spain (gross) Buy eBook ISBN 978-3-319-73168-1; Digitally watermarked, DRM-free Cellulose activation - SlideShareSep 20, 2013 · 4 Dissolution Dissolving grade pulp Pre-treatment:mech. + enz. treatments Regenerated fibres Clothes Hygiene products, wipes FuBio Cellulose From cellulose to textiles The process development of novel sustainable solvent systems for cellulose is connected with the opening up of the fibre structure 5.

Competing forces during cellulose dissolution:From

Feb 01, 2014 · The dissolution of cellulose in NaOHwater for cellulose processing was first considered by Japanese scientists , . The aqueous alkali systems often, however, do not completely disrupt the semicrystalline regions of cellulose and the solubility is limited to cellulose Deep eutectic solvents (DESs) for cellulose dissolution:a Nov 17, 2018 · Deep eutectic solvents (DESs), which are a novel class of sustainable designer solvents, have attracted considerable attentions in the field of cellulose chemistry. Due to their low cost and analogous physico-chemical properties to ionic liquids, DESs are expected to be alternative solvents for dissolving cellulose. However, at present, the solubility of cellulose in DESs is much lower than in

Dissolution and Gelation of Cellulose in TBAF/DMSO

Solutions of cellulose in a mixture of tetrabutylammonium fluoride and dimethyl sulfoxide (TBAF/DMSO) containing small and varying amounts of water were studied by nuclear magnetic resonance (NMR). By measuring the composition dependences of 19F NMR and 1H NMR chemical shifts and line widths, details on the dissolution and gelation mechanisms for cellulose in TBAF/DMSO were elucidated. Dissolution and transesterification of cellulose in Cellulose dissolution is crucial for its regeneration and the application of its derivative materials. In this study, the dissolution of cellulose in -valerolactone (GVL), promoted by 1-ethyl-3-methylimidazolium acetate ([Emim]OAc), was investigated and 15 wt% -cellulose was rapidly dissolved by the designed mixed organic electrolyte solvents (OESs) at 80 °C in 1 h.

Dissolution and transesterification of cellulose in

Cellulose dissolution is crucial for its regeneration and the application of its derivative materials. In this study, the dissolution of cellulose in -valerolactone (GVL), promoted by 1-ethyl-3-methylimidazolium acetate ([Emim]OAc), was investigated and 15 wt% -cellulose was rapidly dissolved by the designed mixed organic electrolyte solvents (OESs) at 80 °C in 1 h. Dissolution of Cellose with Ionic Liquids Journal of the We report here initial results that demonstrate that cellulose can be dissolved without activation or pretreatment in, and regenerated from, 1-butyl-3-methylimidazolium chloride and other hydrophilic ionic liquids. This may enable the application of ionic liquids as alternatives to environmentally undesirable solvents currently used for dissolution of this important bioresource.

Dissolution of cellulose in aqueous NaOH/urea solution

Mar 02, 2014 · Urea can improve the solubility and stability of cellulose in aqueous alkali solution, while its role has not come to a conclusion. To reveal the role of urea in solution, NMR was introduced to investigate the interaction between urea and the other components in solution. Results from chemical shifts and longitudinal relaxation times show that:(1) urea has no strong direct interaction with Dissolution of cotton by 1-ethyl-3-methylimidazolium This study has investigated the dissolution of cotton fibres in the ionic liquid 1-ethyl-3-methylimidazolium acetate ([C2mim][OAc]) for three fibre arrangements. Dissolution was carried out with excess [C2mim][OAc] at various temperatures and times followed by coagulation with water. Optical microscopy (OM) of the resulting processed and dried cotton fibres indicated that this procedure

Dynamic Self-Assembly Induced Rapid Dissolution of

Cellulose can be dissolved in precooled (12 °C) 7 wt % NaOH12 wt % urea aqueous solution within 2 min. This interesting process, to our knowledge, represents the most rapid dissolution of native cellulose. The results from 13C NMR, 15N NMR, 1H NMR, FT-IR, small-angle neutron scattering (SANS), transmission electron microscopy (TEM), and wide-angle X-ray diffraction (WAXD) Dynamic Self-Assembly Induced Rapid Dissolution of Cellulose can be dissolved in precooled (12 °C) 7 wt % NaOH12 wt % urea aqueous solution within 2 min. This interesting process, to our knowledge, represents the most rapid dissolution of native cellulose. The results from 13C NMR, 15N NMR, 1H NMR, FT-IR, small-angle neutron scattering (SANS), transmission electron microscopy (TEM), and wide-angle X-ray diffraction (WAXD)

Effects of activation on cellulose dissolution Enzymatic

Activation of cellulose to improve solubility of pulps in NaOH-water dissolution of cellulose in NaOH-water using urea, thiourea with or without ZnO. Cemef since 2001 (Understanding solution properties with and without additives. Preparation of various products). Finally Dissolved! Activation Procedures to Dissolve Title:Finally Dissolved!Activation Procedures to Dissolve Cellulose in DMAc/LiCl Prior to Size Exclusion Chromatography Analysis A Review. VOLUME:1 ISSUE:1 Author(s):Ute Henniges, Philipp Vejdovszky, Martin Siller, Myung-Joon Jeong, Thomas Rosenau and Antje Potthast Affiliation:University of Natural Resources and Life Sciences (BOKU), Department of Chemistry and Christian-Doppler

Finally Dissolved! Activation Procedures to Dissolve

Title:Finally Dissolved!Activation Procedures to Dissolve Cellulose in DMAc/LiCl Prior to Size Exclusion Chromatography Analysis A Review. VOLUME:1 ISSUE:1 Author(s):Ute Henniges, Philipp Vejdovszky, Martin Siller, Myung-Joon Jeong, Thomas Rosenau and Antje Potthast Affiliation:University of Natural Resources and Life Sciences (BOKU), Department of Chemistry and Christian-Doppler General Considerations on Structure and Reactivity of Xiaopeng Xiong, Jiangjiang Duan, Dissolution and Application of Cellulose in NaOH/Urea Aqueous Solution, The Role of Green Chemistry in Biomass Processing and Conversion, 10.1002/9781118449400, (205-240), (2012).

Ionic liquid and deep eutectic solvent-activated CelA2

Chemoenzymatic cellulose degradation is one of the key steps for the production of biomass-based fuels under mild conditions. An effective cellulose degradation process requires diverse physico-chemical dissolution of the biomass prior to enzymatic degradation. In recent years, green solvents, such as ionic liquids and, more recently, deep eutectic liquids, have been proposed as suitable Modification of Cellulose - SpringerLinkMay 12, 2018 · The modification of cellulose is introducing organic and inorganic compounds on the polymer. A significant variation in the cellulose properties can be observed with the binding of polymers. Also, mineralization of cellulose has attracted a great deal of attention in recent years. This chapter investigated all of these modifications on cellulose.

Production of Dissolving-Grade Pulp - SpringerLink

Abstract. Dissolving-grade pulps are commonly used for the production of cellulose derivatives and regenerated cellulose. To obtain products of high quality, these so-called special pulps must fulfill certain requirements, such as high cellulose content, low hemicellulose content, a uniform molecular weight distribution, and high cellulose reactivity. Production of Dissolving-Grade Pulp - SpringerLinkAbstract. Dissolving-grade pulps are commonly used for the production of cellulose derivatives and regenerated cellulose. To obtain products of high quality, these so-called special pulps must fulfill certain requirements, such as high cellulose content, low hemicellulose content, a uniform molecular weight distribution, and high cellulose reactivity.

Reflections on the Solubility of Cellulose Industrial

Wood cellulose can be used for producing biofuels and biopolymers, thus offering a solution to global concerns on the excessive use of fossil fuels. This requires a cellulose solvent that also allows the ecofriendly processing of selective wood components. Some ionic liquids (ILs) have shown promising results as cellulose solvents with many advantages over traditional approaches. It is agreed Role of Solvent Parameters in the Regeneration of Cellulose dissolution and regeneration in ionic liquids:A computational perspective. Chemical Engineering Science 2015, 121, 180-189. DOI:10.1016/j.ces.2014.07.025. Xueming Yuan, Gang Cheng. From cellulose fibrils to single chains:understanding cellulose dissolution in ionic liquids.

Role of Solvent Parameters in the Regeneration of

The ionic liquids 1-ethyl-3-methylimidazolium acetate [emim]OAc, N,N,N,N-tetramethylguanidium propionate [TMGH]EtCO2, and N,N,N,N-tetramethylguanidium acetate [TMGH]OAc, and the traditional cellulose solvent N-methylmorpholine N-oxide NMMO were characterized for their KamletTaft (KT) values at several water contents and temperatures. For the ionic liquids and NMMO, thresholds of Role of low-concentration acetic acid in - SpringerLinkMay 28, 2018 · Material characterization results indicated that no cellulose acetylation occurred during the dissolution process and the acetic acid could be easily removed during cellulose regeneration. It was also noticed that using LCAA to activate cellulose significantly reduced the viscosity of cellulose solution and promoted the dissolution of HMW

The action of strong nitric acid on cotton cellulose

George Ernest Collins, XV.THE SWELLING OF COTTON CELLULOSE, Journal of the Textile Institute Transactions, 10.1080/19447022308661252, 14, 8, (T264-T276), (1923). Crossref Volume 33 , Issue 3 Thermal lifetime of cellulose insulation material Oct 22, 2013 · A rapid method, based on a logarithmic degradation model of insulation material, is proposed to reduce the test duration in lifetime assessment of cellulose paper insulating materials. This method proposes the determination of the activation energy from a non-isothermal measurement made by differential scanning calorimetry or another thermal analysis technique and an aging test at a single

Cellulose Activation and Dissolution SpringerLink

Feb 13, 2018 · Petrus L, Gray DG, BeMiller JN (1995) Homogeneous alkylation of cellulose in lithium chloride/dimethyl sulfoxide solvent with dimsyl sodium activation. A proposal for the mechanism of cellulose dissolution in lithium chloride/DMSO. Carbohydr Res 268:319323 CrossRef Google Scholar

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