title: Dissolution and recovery of cellulose from 1-butyl-3-methylimidazolium chloride in presence of water.
abstract: The dissolution and recovery of microcrystalline cellulose from 1-butyl-3-methylimidazolium chloride, [bmIm][Cl], were studied. At 90 °C and 5 h dissolution time, the regenerated cellulose could be recovered above 80 wt% with a less than 10% decrease in the value of the viscosity-average degree of polymerization, DP(v), regardless of water content. Recovery ratio and DP(v) of regenerated cellulose at 120 °C decreased with time regardless of water content. The regenerated cellulose after dissolution at 120 °C for 10 h regardless of water content had cellulose II structure. Regenerated cellulose at short dissolution times or low temperature had high amorphous content. Both [bmIm][Cl] and [bmIm][Cl] with water act as a non-derivatizing solvent for microcrystalline cellulose at 90 °C, and as a derivatizing solvent at 120 °C. The main effect of added water on the dissolution of cellulose at high temperature was the promotion of cello-oligosaccharide and levoglucosan formation.
authors.affiliation: Graduate School of Engineering, Research Center of Supercritical Fluid Technology, Tohoku University Aramaki Aza Aoba 6-6-11, Aoba-ku, Sendai 980-8579, Japan.
authors.forename: Masayuki
authors.initials: M
authors.lastname: Iguchi
authors.forename: Taku Michael
authors.initials: TM
authors.lastname: Aida
authors.forename: Masaru
authors.initials: M
authors.lastname: Watanabe
authors.forename: Richard L
authors.initials: RL
authors.lastname: Smith
mesh_terms: D002482:Cellulose / Q000737:chemistry*; D007093:Imidazoles / Q000737:chemistry*; D052578:Ionic Liquids / Q000737:chemistry*; D058105:Polymerization; D012997:Solvents / Q000737:chemistry; D013696:Temperature; D014783:Viscosity; D014867:Water / Q000737:chemistry
chemical_list: D007093:Imidazoles; D052578:Ionic Liquids; D012997:Solvents; D014867:Water; C502841:1-butyl-3-methylimidazolium chloride; D002482:Cellulose; C109691:microcrystalline cellulose