合成甘油碳酸酯体系的液液相平衡与cao基催化剂分析word格式论文.docxVIP

AbstractGlycerol carbonate, a green chemical, is a kind of organic chemical raw materials widely used. It is mainly used as reaction intermediates and solvents, or reacts with isocyanate, acrylic ester products and product polymer to use in coating, adhesive and lubricant and so on. this dissertation is based on the transesterification of DMC and methanol to produce Glycerol carbonate, and mainly focused on the research for thermodynamics and catalysts aboat this system to lay the foundation for the development of subsequent synthesis process of glycerol carbonate .Liquid–liquid equilibria (LLE) data of the ternary system dimethyl carbonate + methanol + glycerol were measured from 303.15 K to 333.15 K. The equilibrium data are correlated with the NRTL and UNIQUAC model. The reliability of this model is tested by comparison with the experimental results. On the other hand, LLE and vapor–liquid equilibria (VLE) of the binary system dimethyl carbonate + glycerol were also measured under isopiestic pressure (101.3 kPa) and predicted using the NRTL model, with the adjusted parameters obtained from the LLE data of the ternary system dimethyl carbonate+ methanol + glycerol. The predicted VLE and LLE for the binary system agreed well with the experimental data.The extruded CaO-based catalysts were prepared and used for the synthesis of glycerol carbonate from glycerol and dimethyl carbonate. The effects of binders (diatomite, kaolin, and activated alumina), pore-forming agents (polyacrylamide, activated carbon, and polyethylene glycol), and calcination temperatures (700 oC, 800 oC, and 900 oC) on the catalytic activity and stability of the catalyst were investigated. XRD, FT-IR, BET, and SEM were used for the characterization of the prepared catalyst. It was found that the initial activity of the fresh extruded CaO-based catalyst is lower than the CaO powdercatalyst because of the resistance of the internal diffusion; however, the stability of the former was far better than