Study On Synthesis And Kinetics Of 1, 3-Propanediol

In this paper, the synthesis of 1,3-propanediol from1,3-dicholoropropene through three steps was studied. The first step and thesecond step was improved, then kinetics of the hydration of Aceticacid ,3-Chloropropyl ester was studied.First, the synthesis of Acetic acid,3-Chloropropene ester from1,3-dicholoropropene, using Benzyltriethylammonium Chloride asphase-transfer catalyst, was studied. Then, the favorable reaction conditionswere found as followed, by changing the reaction conditions, such astemperature, time and n(CH2C1CH2CH2C1):n(NaAc):Catalyst: 3ï¼…Temperature: 110℃Reaction time 2.5hn(CH2C1CH2CH2C1):n(NaAc) 1:1.2Second, the hydration of Acetic acid, 3-Chloropropyl ester fromAcetic acid, 3-Chloropropene ester, using Pd/γ-Al2O3 as catalyst, wasstudied. Then, the favorable reaction conditions were found as followed, bychanging the reaction conditions, such as pressure ,temperature, reactiontime and the amount of the catalyst:Catalyst: 5ï¼…Temperature: 40℃Reaction time: 110minpressure: 1MPa In the end, Kinetics of the hydration of Acetic acid ,3-Chloropropylester from Acetic acid, 3-Chloropropene ester was studied in a 300mlagitating slurry reactor. The reaction conditions were p=0.6～1.0 MPa, t=20～40℃, 0.5g of Pd/γ-Al2O3 catalyst. Under steady state, kineticexperimental data were measured after internal diffusion and externaldiffusion were eliminated. Kinetic models based Acetic acid,3-Chloropropyl ester synthesis model and Acetic acid, propyl ester wereestablished with Langmuir-Hinshelwood type kinetic. The mechanism andkinetic parameters were detrmined by applying nonleaner regression to thekinetic models and experimental data.The result showed that the activationenergy of surface reaction about 3-Chloropropyl ester synthesis and Aceticacid, propyl ester are 32.937KJ/mol and 32.422KJ/mol. Kinetic equatiosare followed: r_s1=0.9083P_H2/(1+0.1432P_H2^1/2)²C_A r_s2=0.3990P_H2^0.8871/(1+0.1432P_H2^1/2)²C_A...