Study On Dissolution Of Cellulose In Ionic Liquid And Hydrothermal Carbonization Of Cellulose

Cellulose is a kind of biomass resources which is abundant, and peoplepay attention to it because of its low cost and degradable. However, theexistence of a large number of intermolecular and intra-molecular hydrogenbonds in cellulose and its stable crystal structure make it hard for mostsolvent. This feature prevents people from exploitation and utilization ofcellulose resources. In this paper, therefore, microcrystalline cellulose is usedas raw material and a research on the dissolution of cellulose in ionic liquidhas been done. Meanwhile, preparation of carbon microspheres byhydrothermal method has been done and a preliminary study of the cellulosein [Bmim]Cl for hydrogen production has been done. The main researchcontents are as follows:1) Influences of temperature, time and mass ratio of [Bmim]Cl andmicrocrystalline cellulose on the dissolution of microcrystalline cellulosewere investigated. The appearance and crystallization of the regenerated microcrystalline cellulose were characterized by using scanning electronmicroscope and X-ray diffraction. A preliminary analysis of the mechanismof the dissolution of cellulose in [Bmim]Cl has been done. Results showedthat [Bmim]Cl was a good solvent for microcrystalline cellulose and48.7%of dissolution rate of microcrystalline cellulose was achieved under optimalconditions of90for1.5h with5g:0.5g of mass ratio of [Bmim]Cl andmicrocrystalline cellulose.2) Influences of temperature, time on the carbonization ofmicrocrystalline cellulose were investigated. A preliminary analysis of themechanism of carbonation of cellulose was done. The appearance andcrystallization of the product were characterized by using scanning electronmicroscope and X-ray diffraction. Results showed that250is the lowesttemperature for carbonation; with the increase of temperature,microcrystalline cellulose changed into spherical carbon materials.3) A platform was built for the test of hydrogen yield. Influences oftemperature, time on the hydrogen production were investigated. Resultsshowed that the maximum hydrogen yield was achieved when thetemperature was210and the time was3hours.