固体酸催化合成丙烯酸异冰片酯动力学

以莰烯和丙烯酸为原料,采用自制SO_4~(2-)/TiO_2-SnO_2固体超强酸为催化剂催化合成丙烯酸异冰片酯(IBOA),考察了催化剂用量对IBOA收率的影响,并研究了该反应的本征动力学方程。结果表明,在搅拌速率大于400 r/min,催化剂粒径小于83μm时,可消除内外扩散。通过机理基元反应动力学,建立丙烯酸与莰烯合成IBOA的反应动力学模型,分析可知,该合成反应的正反应为二级反应、逆反应为一级反应,反应活化能为60.089 k J/mol,指前因子为4.068×10~5 L/(mol·g·min),该动力学模型预测的结果与实验结果吻合良好。

Kinetics of Catalytic Synthesis of Isobornyl Acrylate over Solid Acid

The isobornyl methacrylate (IBOA) was synthesized using camphene and acrylic acid as raw materials catalyzed by homemade solid super acid SO42-/TiO2-SnO2. The effects of catalyst dosage on the yield of IBOA were investigated, and the intrinsic kinetic equation of the reaction was studied. The results showed that the diffusion rate could be eliminated when the stirring rate was more than 400 r/min and the particle size was less than 83μm. The reaction kinetics model of synthesis of IBOA with acrylic acid and camphene was established by the mechanism kinetic. The results showed that the positive reaction of the synthesis reaction was second-order reaction, the reverse reaction was first-order reaction, the activation energy was 60.089 kJ/mol, and the pre-exponential factor was 4.068×105 L/(mol·g·min). The predicted results were in good agreement with the experimental results.