Studies On Catalytic Synthesis Of Monomer For PVP And Kinetics From γ-Butyrolactone

Polyvinylpyrrolidone(PVP) plays an important role in many fields such as medicine, iatrosanitary, cosmetics, food-beverage, new materials as a fine polymer chemical because of its high properties of solubility, low toxicity, chemical stability, adhesivity and complexity with or adsorptivity of some micromoleculars. PVP was synthesized in 1930s by W.Reppe through Ethyne Method including addition of formaldehyde to ethyne, catalytic hydrogenation, catalytic dehydrogenation, amination, addition of formaldehyde to pyrrolidone and polymerization of NVP. Hitherto, major PVP products are still produced by this method in which ethyne is hazardous, high pressure and multisteps are needed. Other methods including y-butyrolactone method are in research stage. So it is of great significance to do research for synthesis method and production technology of PVP and its monomer.In this dissertation, N-vinylpyrrolidone, that is monomer for PVP, is synthesized through gas catalytic reaction of y-butyrolactone and ethanolamine and catalytic dehydration of hydroxyethenylpyrrolidone (NHP) . Works focus on the amination reaction. Main contents and conclusions are below:1. Y zeolites and NaZSM-5 zeolite are modified by impregnating method using nitrate salts. Activities of the modified zeolites for the reaction of γ-butyrolactone and ethanolamine to give NHP are studied. It is found that the activities of zeolites change with their composition and Y zeolites show higher activities than ZSM-5 zeolites generally and ZSM-5 zeolites show higher stability. HY, Cu-NaY, REY and Cu-REY have comparatively high NHP yields. Original activity of Cu-NaY is the highest but decreases rapidly. Cu-REY has the highest stability. Influences of main conditions on the reaction are investigated and the conditions optimized are below: reaction temperature 260℃ 280℃ , contact time 25³0g·h·mol^-1, molar ratio of ethanolamine to y-butyrolactone 4⁵, the ratio of reactants to N₂ 1～2, catalyst use level 5g and catalyst particle size 80 100mesh.Influences of catalysts composition on the reaction and relation of catalytic activity...