Reaction Kinetics for Preparation of Methacrolein by Condensation of Formaldehyde with Propionaldehyde
甲醛和丙醛缩合制备甲基丙烯醛反应动力学

A series of second amines were used to catalyze the synthesis of methacrolein from formaldehyde and propionaldehyde via Mannich reactionBy using diethylamine,the highest yield of 94% was obtained.The kinetic model was obtained by analysis of the reaction process.The parameters in the model were determined:reaction order 2.456,activation energy 62.45 kJ/mol and frequency factor 8.182×107（mol/L）-1.456/s.In situ FT-IR spectroscopy was introduced to monitor the concentration of compounds in real time during the reaction.The samples taken in different reaction times were analyzed by GC-MS,and the intermediate Mannich base was detected,laying a foundation for the reaction mechanism.