乙酸异戊酯杂多酸催化合成及其动力学研究

CATALYTIC SYNTHESIS OF ISOAMYL ACETATE WITH HETEROPOLY ACID CATALYST AND ITS KINETIC STUDY

研究了以钨硅酸为催化剂，苯为带水剂，乙酸和异戊醇直接酯化合成乙酸异戊酯的优化反应条件。该杂多酸催化反应的速率方程为－ｄｃＡ／ｄｔ＝ｋＡｃＡｃＢ，反应表观活化能Ｅａ＝１４２．５７ｋＪ／ｍｏｌ，反应速率常数ｋＡ（Ｌ·ｍｏｌ－１·ｍｉｎ－１）＝７．７５×１０１７ｅｘｐ（－１７１４８．２／Ｔ）。

The optimal reaction conditions have been determinated to which the acetic acid with isoamyl alcohol are esterified into isoamyl acetate in the presence of heteropoly acid catalyst and hydrocarrying agent benzene. The rate equation for the heteropoly acid catalytic esteri fication was derived as - d c A d t=k A c A c B . The apparent activation energy E a =142.57 kJ·mol , and the rate constant k A =7.75×10 17 exp -17148.2T.