Study On Synthesise Of Ethyl Lactate By Ultrafine Magnetic Super Solid Acid Catalyst

We adopted chem-deposition method integrating dispersant to prepare ultrafine magnetic particles. Through low temperature deposition, we prepare ultrafine ZrO₂-Fe₃O₄ particles. After immersing in sulfur acid, we get the SO42-/ ZrO₂^Fe₃O₄ ultrafine magnetic super solid acid. Through XRD, TPD, IR etc. method to character the catalyst, the result indicate that the particle size is between 271nm—496nm and it belongs to midding intensity supersolid acid. The magnetic results shows that σ s=97.96 emu .g-1, σ r= 12.32 emu.g-1 , particle size is at 271 nm-496nm.Using the catalyst to catalyse the reaction of lactic acid and ethanol, we studied the effect of calcined temperature, calcined time, ratio of ZrO2 and Fe3O4,and concentration of immersing solution on the activity of catalyst. The experimental results indicate that the optimization of preparation is:Fe₃O₄:ZrO2=1:5.5,pH=11.5,amount of dispersant accounts for 1% of catalyst,activation temperatue is 400℃,activation time is 2.5h. The optimization result we have gotten is:catalyst accout for 3% of lactic acid amount,proportion of ethanol to acid is 1:5,reaction time is 4.5h.The highest yield rate of ethyl lactest is 74.13%.Catalyst can be recycled,and the recycle ratio is 98.85%. These results illuminate the catalyst we prepared has reached our anticipation.At last,we take a piot study on kinetics.The conclusion is obtained: the esterification is second-order reaction, and the hydrolysis is zero-order reaction, so the model for reaction kinetics is obtained:...