Dissolution of Pulp in Room-Temperature Ionic Liquids: A Comparative Study
Keywords:Cellulose dissolution, ionic liquids, cellulose hydrolysis, regenerated cellulose
AbstractThis work aims to synthesize room-temperature ionic liquids (RTILs) by combining cations (ie olefins and alkyl-based imidozalium) and anions (phosphate and chloride). The synthesized RTILs exhibited considerable solubility for pulp at temperatures ranging from 35 to 100°C compared with the typical ILs of 1-butyl-3-methylimidazolium chloride (BminCl), 1-ethyl-3-ethylimidazolium chloride (AeimCl), and 1-ethyl-3-methylimidazolium phosphorous methyl ester (EminMeOPO2H). The mixture composed of AeimCl and EmimMeOPO2H showed a significant decrease in pulp solubility compared with either of the two alone and the RTILs. X-ray diffraction (XRD) analysis indicated that anions probably play significant roles in the decrystallization of pulp through the dissolution-regeneration process. The thermal property of the ILs was investigated using thermogravimetric analysis (TGA) and differential scanning calorimetry (DSC).
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