Pretreatment of softwood dissolving pulp with ionic liquids
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Dongfang Li
Abstract
Few Scandinavian pulp mills produce dissolving pulps; however, the demand on textile fibers is increasing. This study investigates the chemical interaction of dissolving pulp with ionic liquids (ILs), where softwood and hardwood industrial dissolving pulps were pretreated with ILs 1-butyl-3-methy-limidazolium acetate ([C4mim+]CH3COO-) and 1-butyl-3-methyl-imdazolium chloride ([C4mim+]Cl-). Time and temperature dependence of the dissolution process as well as the impact of the pretreatment on the molecular weight properties, thermal stability, morphology, and crystallinity of the cellulose were evaluated by means of size exclusion chromatography (SEC), thermogravimetric analysis (TGA), scanning electron microscopy (SEM), X-ray diffraction (XRD), and solid state nuclear magnetic resonance (NMR). It was shown that the dissolution of cellulosic material in ILs is a temperature-dependent process; however, the viscosity of ILs affected the efficiency of dissolution at a given temperature. Molecular weight properties were affected negatively by increased dissolution temperature, while the type of antisolvent for the regeneration had no major impact on the degree of polymerization of cellulose. Water was more efficient than ethanol for the regeneration of cellulose when performed at an elevated temperature. The pretreatment decreased the crystallinity of cellulosic material. This might lead to the increased accessibility and reactivity of cellulose.
©2012 by Walter de Gruyter Berlin Boston
Artikel in diesem Heft
- Masthead
- Masthead
- Original Papers
- Proposed supramolecular structure of lignin in softwood tracheid compound middle lamella regions
- Degradation products of lignocellulosics in pulp mill effluents – comparison and evaluation of different gas chromatographic techniques for a comprehensive analysis
- Analysis of DCM extractable components from hot-pressed hybrid poplar
- Pretreatment of softwood dissolving pulp with ionic liquids
- Probing the chemical and surface chemical modification of vessel cell walls during bleaching of eucalyptus pulp
- Chemotaxonomical identification of Holocenic bogwood recovered after 2007 Niigataken Chuestsu-oki Earthquake
- Tensile creep and recovery of Norway spruce influenced by temperature and moisture
- Solvent-free chemical modification of wood by acetic and butyric anhydride with iodine as catalyst
- Synchrotron-based tomographic microscopy (SbTM) of wood: development of a testing device and observation of plastic deformation of uniaxially compressed Norway spruce samples
- Effects of polymeric matrix on accelerated UV weathering properties of wood-plastic composites
- Nano- and microstructures in stretched and non-stretched blend gels of cellulose and hemicelluloses
- Dimensional and hygroexpansive behaviors of cellulose microfibrils (MFs) from kraft pulp-based fibers as a function of relative humidity
- Effect of quat- and amino-silicones on fungal colonisation and decay of wood
- Copper precipitation of Cu-monoethanolamine preservative in wood
- Short Note
- Mode II critical stress intensity factor of wood measured by the asymmetric four-point bending test of single-edge-notched specimen while considering an additional crack length
- Erratum
- Treating birch wood with a switchable 1,8-diazabicyclo-[5.4.0]-undec-7-ene-glycerol carbonate ionic liquid
- Meetings
- Meetings
Artikel in diesem Heft
- Masthead
- Masthead
- Original Papers
- Proposed supramolecular structure of lignin in softwood tracheid compound middle lamella regions
- Degradation products of lignocellulosics in pulp mill effluents – comparison and evaluation of different gas chromatographic techniques for a comprehensive analysis
- Analysis of DCM extractable components from hot-pressed hybrid poplar
- Pretreatment of softwood dissolving pulp with ionic liquids
- Probing the chemical and surface chemical modification of vessel cell walls during bleaching of eucalyptus pulp
- Chemotaxonomical identification of Holocenic bogwood recovered after 2007 Niigataken Chuestsu-oki Earthquake
- Tensile creep and recovery of Norway spruce influenced by temperature and moisture
- Solvent-free chemical modification of wood by acetic and butyric anhydride with iodine as catalyst
- Synchrotron-based tomographic microscopy (SbTM) of wood: development of a testing device and observation of plastic deformation of uniaxially compressed Norway spruce samples
- Effects of polymeric matrix on accelerated UV weathering properties of wood-plastic composites
- Nano- and microstructures in stretched and non-stretched blend gels of cellulose and hemicelluloses
- Dimensional and hygroexpansive behaviors of cellulose microfibrils (MFs) from kraft pulp-based fibers as a function of relative humidity
- Effect of quat- and amino-silicones on fungal colonisation and decay of wood
- Copper precipitation of Cu-monoethanolamine preservative in wood
- Short Note
- Mode II critical stress intensity factor of wood measured by the asymmetric four-point bending test of single-edge-notched specimen while considering an additional crack length
- Erratum
- Treating birch wood with a switchable 1,8-diazabicyclo-[5.4.0]-undec-7-ene-glycerol carbonate ionic liquid
- Meetings
- Meetings
