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日用化学工业（中英文）

日用化学工业 ›› 2016, Vol. 46 ›› Issue (1): 8-12.doi: 10.13218/j.cnki.csdc.2016.01.002

• 基础研究 • 上一篇    下一篇

乙酸辛酯的合成及其动力学研究

刘群,丁斌,关昶,王海东,李祥,郝凤岭   

  1. 吉林化工学院 轻化工程系,吉林 吉林 132022
  • 出版日期:2016-01-22 发布日期:2016-01-22
  • 通讯作者: 丁 斌,教授,硕士,电话:13704401937,E-mail:dingbin1956@163.com。
  • 作者简介:刘 群(1987-),男,山东莒南人,讲师,硕士,电话:15948639156。

Kinetics of synthesis of octyl acetate

LIU Qun,DING Bin,GUAN Chang,WANG Hai-dong,LI Xiang,HAO Feng-ling   

  1. Department of Light Chemical Engineering,Jilin Institute of Chemical Technology,Jilin,Jilin 132022,China
  • Online:2016-01-22 Published:2016-01-22

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摘要： 以阳离子交换树脂NKC-9为催化剂,乙酸和辛醇为原料合成乙酸辛酯,考察乙酸和辛醇摩尔比、催化剂用量和反应时间等因素对辛醇转化率的影响,以及催化剂的重复使用性能。结果显示,乙酸辛酯合成的较佳工艺条件为:n(乙酸)∶n(辛醇)＝4∶1,反应时间为3 h,催化剂用量为乙酸和辛醇总质量的6%,反应温度为118~120 ℃,在此条件下辛醇转化率可达96.80%,且催化剂活化后可重复使用。分别采用正反应常数法和初始反应速率法测定阳离子交换树脂NKC-9催化合成乙酸辛酯的动力学模型参数,获得了可逆二级动力学方程的参数,表观活化能和指前因子分别为:正反应常数法Ea=38.74 kJ/mol,k0=7.45×102 L/(mol·min);初始反应速率法Ea=37.45 kJ/mol,k0=4.79×103 L/(mol·min)。2种方法测定结果基本一致,印证了该理论数据的可靠性。

关键词: 乙酸辛酯, 阳离子交换树脂, 催化合成, 动力学

Abstract: Octyl acetate was prepared with acetic acid and 1-octyl alcohol as starting materials,and cationic exchange resin NKC-9 as catalyst.Effect of reaction conditions,such as mole ratio of acetic acid to 1-octyl alcohol,catalyst dosage and reaction time on conversion as well as reusing performance of the catalyst were investigated.Results showed that the optimum reaction conditions were as following:mole ratio,n(acetic acid)∶n(1-octyl alcohol)=4∶1;dosage of cationic exchange resin NKC-9,6% of the total mass of acetic acid and 1-octyl alcohol;reaction temperature,118-120 ℃;reaction time,3 h.Under such conditions the conversion of 1-octyl alcohol can reach 96.80%.The catalyst can be activated and reused.The parameters of the kinetic model were determined by both positive reaction equilibrium constant method and initial reaction rate method;and the parameters for the reversible second-order reaction of this system were evaluated.With positive reaction equilibrium constant method,the frequency factor k0 was obtained as 7.45×102 L/(mol·min) and the apparent activation energy Ea was obtained as 38.74 kJ/mol.With initial reaction rate method the k0 was obtained as 4.79×103 L/(mol·min) and the Ea was obtained as 37.45 kJ/mol.These two kinds of methods substantially confirmed each other and can assure that the data are reliable.

Key words: octyl acetate, cationic exchange resin, catalytic synthesis, kinetics

中图分类号: 

  • TQ655