Study On Kinetics Of Hydroly-sis And Esterification Of 2-Methyla Chloride

2-Methylallyl alcohol is an important organic intermediate,which is widely used in the synthesis of pesticide,medicine,perfume,resin and polycarboxylic acid water reducing agents.Existing research focused on the optimization of 2-methylallyl alcohol synthesis process,therefore,the hydrolysis and esterification kinetics of 2-methylallyl chloride has been studied in this thesis.The hydrolysis mechanism was investigated and a kinetic model was established after products under different hydrolysis times were tested through gas chromatography.The exploration through single factor experiments of the influence of reaction conditions on the hydrolysis of 2-methylallyl chloride in gave the optimum combined process conditions as follows:temperature 383.15 K,the molar ratio of sodium hydroxide to 2-methylallyl chloride 1.0,mass fraction of sodium hydroxide aqueous solution 10%,time 60 minutes,and conversion of 2-methylallyl chloride 97.12%,yield of 2-methylallyl alcohol 87.63%.The reaction of 2-methylallyl chloride and aqueous solution of sodium hydroxide was carried out on the basis of eliminating the influence of mass transfer.The results show that the hydrolysis reaction occurs in the aqueous phase,producing 2-methylallyl alcohol and by-product di-(2-methylallyl)-ether After linearizing the kinetic equation by integral method,the dynamic parameters were solved out.The apparent activation energy of the hydrolysis reaction is 98.25 kJ/mol,while the apparent activation energy of the side reaction to form di-(2-methylallyl)-ether is 83.89 kJ/mol.The activation energy of the main reaction is greater than that of the side reaction,and increasing temperature is beneficial to the reaction.Esterification of 2-methylallyl chloride and sodium acetate solution was studied and the corresponding kinetic model was established,which showed that esterification also occurred in aqueous phase with 2-methylallyl acetate as main product and 2-methylallyl alcohol from 2-methylallyl chloride hydrolysis.After mathematical treatment of kinetic equations,the apparent activation energy of the reaction between 2-methylallyl chloride and sodium acetate was 93.59kJ/mol,and the apparent activation energy of the reaction between 2-methylallyl chloride and water was 95.02 kJ/mol,which indicates higher temperature favors more 2-methyl allyl alcohol.The solid-liquid phase-transfer catalytic esterification between 2-methylallyl chloride and solid sodium acetate was carried out to give esterification mechanism and kinetics equations catalyzed by phase transfer catalyst onium salt,and the influence of different factors on the reaction.Reaction between 2-methylallyl chloride and sodium acetate catalyzed by hexadecyl trimethyl ammonium chloride was pseudo first order and the apparent activation energy was 97.61 kJ/mol.