Study On Synthesis Of Ionic Liquid With Microwave And Preparation Of Rice Straw Cellulose Membrane

With increasing cut of oil resources, the gloomy prospects of related products and their harm to the environment are forcing people actively to look for environmentally friendly material to take the place. Cellulose has some characteristics including quickly renewable and natural degradation. It is new promising material in application. However, due to its complex structure, stable nature and difficulty in dissolving in general solvent, cellulose has been restricted a lot in application. While the ionic liquid is born to solve these problems, with its advantages of stable and excellent performance, easy storage, ablility to be recycled, which contribute to its important role in cellulose research work. The yield of rice is abundant in China. What’s more, rice straw with rich content of cellulose has not been made use of or valued till now. Therefore, cellulose membrane with rice straw as raw material is bound to be meaningful in research and application undoubtedly.Based on the above situation, the paper selects common rice straw as raw material to extract the component, cellulose,make ionic liquid [BMIM]C1with microwave, and use this solvent make renewable cellulose membrane to be tested on its performance:First, synthesize [BMIM]Cl with microwave solvent-free method. The results of FT-IR show that this method can successfully gain the target product. Compared with immersion method, this method can cut down the reaction time extremely. Secondly, use acid-and-alkaline-solutions fractional method to extract cellulose from rice straw and characterization it. The orthogonal experiment method gives the best processing conditions of this process of extract:at the premise of the ratio of1:10for solid-liquid, treat rice straw with5%HNO3for2 hours at first, and then process with2%NaOH for1.5h. Nital method shows that the quantity of cellulose can reach95%. Finally, dissolve cellulose from rice straw in ionic liquid [BMIM]Cl and use Precipitation-gel method to make cellulose membrane. The results of FT-IR show that the groups of cellulose don’t change before and after rebirth and the process of the rebirth of cellulose in ionic liquid is a physical process. Single-factor experiment within orthogonal experiment shows that when at the solution temperature of120℃, cellulose solution of11%density can obtain cellulose membrane of its best tensile strength (2.5MPa). By comparing and analyzing characteristics on surface, porosity, water flux and tensile strength of cellulose membrane under different coagulation bath, it is known that ethanol can make micropore appear on densified cellulose membrane and the increasing quantity of ethanol can accelerate this phenomenon without no influences on porosity of membrane, but with decreasing tensile strength when porous structure appears.