Preparation Of Supported Ionic Liquids And Applied Research In Hydrolysis Of Propylene Carbonate Reaction

In fine chemicals and catalytic reactions, people have always been seeking a catalyst which is of thermodynamic stability, good solubility as well as of designable cation and anion. Then the appearance of task-specific ionic liquids (TSIL) has resolved above issues and has presented a tempting application prospect for acting as solvent and catalyst. In the homogeneous catalytic reaction between fine chemicals and catalytic reactions, ionic liquid has below disadvantages:large dosage of ionic liquid; difficulty in separating the catalyst from catalytic system. Intended to cope with above issues, this paper has adopted mesoporous silica as the carrier to immobilize TSIL into the pore canal or the skeleton of the mesoporous silica in order to produce a series of new mesoporous silica. By immobilizing TSIL, such kind of new mesoporous silica does not only have the original features of ionic liquids which have high catalytic activity but also possess the advantage as easy to be separated and applicable to reuse.In this paper, functionalized ionic liquids NpmimBF4-FDU, FeCl3-PBImim-PMO and ApmimBr-PMO were synthesized. Immobilized Ionic Liquid catalyst were prepared by immobilization of ionic liquids to inorganic mesoporous materials and activated carbon, and used to catalyze the hydrolysis of propylene carbonate reaction. The main research contents are as follows:(1) The NpmimBF4-FDU catalyst was prepared using FDU-15as the support to immobilize NpmimBF4, which was synthesized from small organic methyl imidazole. The NpmimBF4-FDU catalyst was characterized by FT-IR, TG-DTG, N2adsorption-desorption, X-ray diffraction and transmission electron microscopy methods. The hexagonal p6mm mesostructure of parent siliceous FDU-15is maintained very well in NpmimBF4. NpmimBF4-FDU catalyst has higher catalytic activity in hydrolysis of propylene carbonate reaction, benzaldehyde and malononitrile gave the corresponding yields of99%. The supported catalyst could be easily separated from the reaction system and reused at least five times without loss of catalytic activity.(2) Chloroferrate ionic liquid (FeCl3-PBImim-PMO) was grafted onto pore surface of PMO Via imidazolium cation by using a post-synthesis procedure. The obtained materials were characterized by XRD, N2adsorption-desorption, FT-IR. and TG-DTG It was found that ehloroferrate ionic liquid has been incorporated onto the support intactly and that the support remains its structural integrity during the grafting process. FeCl3-PBImim-PMO catalyst has higher catalytic activity in hydrolysis of propylene carbonate reaction and saved the amount of catalyst. The catalyst reused at least seven times without loss of catalytic activity.(3) Amino functionalized basic ionic liquid which of organo-siloxane was designed and synthesized in this thesis. The mesoporous silica-based material was prepared and used to immobilize the basic ionic liquid by post-synthesis process. The catalytic performance of mesoporous silicon-based material was investigated in the hydrolysis reaction of propylene carbonate. The result shows that the mesoporous silica-based material has higher catalytic activity. Compared with amino functionalized mesoporous silica-based material, the mesoporous silicon-based material which is used to immobilize the basic ionic liquid has higher performance for reuse.