异丁酸正丁酯的催化合成及反应动力学

Synthesis kinetics of n-butyl isobutyrate with cation exchange resin as catalyst

摘要:

以异丁酸和正丁醇为原料，阳离子交换树脂(NKC-9)为催化剂，合成了异丁酸正丁酯。考察了醇酸摩尔比、催化剂用量、反应时间等因素对反应过程的影响，并测定了动力学数据。通过实验得到了较佳制备工艺条件： n(正丁醇):n(异丁酸)＝1.4：1，NKC-9催化剂用量为异丁酸和正丁醇总质量的4%，反应温度≤125℃，反应时间2.0h，在该条件下异丁酸的转化率达到97.6%，催化剂重复使用5次后，异丁酸的转化率为96.4%。建立了该酯化反应的表观动力学模型，得到的反应速率方程。

Abstract:

Synthesis of n-butyl isobutyrate from isobutyric acid and n-butyl alcohol with NKC-9 cation exchange resin as catalyst was studied. The effects of reaction conditions,such as mole ratio of n-butyl alcohol to isobutyric acid,NKC-9 catalyst dosage and reaction time were examined. The kinetic data of this system were measured in a batch reactor.The optimum reaction conditions were found as:mole ratio,n(n-butyl alcohol):n(isobutyric acid)=1.4:1;NKC-9 cation exchange resin as catalyst dosage,4.0%(mass of catalyst relative to total mass of isobutyric acid and n-butyl alcohol);reaction temperature,≤125℃;reaction time,2.0 h.Conversion of isobutyric acid by the process achieves 97.6%,and activity of catalyst Can be maintained at 96.4％ conversion after being used 5 times.At the same time, the apparent kinetic modle of esterification was established,and the equation of reaction rate was derivated .