新型催化剂乙酰丙酮铬（щ）催化合成己酸环氧酯过程的影响因素及其动力学研究

Study on influencing factors of synthesis process of epoxy hexanoate catalyzed with acetylacetone chromium (щ) and its rinetic analysis

摘要:

采用乙酰丙酮铬（щ）为催化剂，催化环氧树脂与己酸的加成酯化反应，探讨了反应温度和催化剂浓度对酯化反应的影响，以及催化剂的活性，并研究了其动力学行为。实验结果表明，乙酰丙酮铬（щ）的催化能力高于叔胺和季胺盐催化剂，当其用量为原料总量的0.4%时，在120℃下反应200min后酯化率可达到86.2%。通过积分反应速率方程,对该反应的实验数据进行了动力学计算，确定乙酰丙酮铬（щ）催化环氧树脂与己酸的加成酯化反应级数为二级,反应表观活化能Ea为142.668kJ/mol。用IR分析和1HNMR核磁对产物进行了表征,证实合成了目标产物。

Abstract:

The addition-esterification of epoxy resin and caproic acid catalyzed by acetylacetonate chromium (щ) was studied. The effects of temperature and the catalyst concentration on the reaction were investigated, and the catalytic ability was examined by comparing with tertiary amine and quaternary ammonium salt. And the reaction product was characterized by FT-IR and 1HNMR. The result showed that acetylacetonate chromium (щ) was a high-efficiency catalyst, with 0.4% of which the conversion of caproic acid could achieve 86.2% at 120℃. The reaction between epoxy resin and caproic acid was a second-order reaction, and the apparent activation energy (Ea) of the reaction was 142.668kJ/mol by kinetic calculations of the experimental data according to the integrated reaction rate equation.