丙烯酸与异丁烯酯化合成丙烯酸叔丁酯动力学

Kinetics of Esterification Reaction of Acrylic Acid and Isobutene to tert-Butyl Acrylate

为实现丙烯酸与异丁烯酯化合成丙烯酸叔丁酯的工业化,在间歇釜式反应器内,研究了磺酸改性SBA-15介孔分子筛催化丙烯酸与异丁烯加成酯化合成丙烯酸叔丁酯的本征反应动力学。结果表明,在搅拌转速大于400 r/min,催化剂粒径为0.15-0.18 mm,可消除内、外扩散影响。测定了酸烯酯化合成丙烯酸叔丁酯的本征反应动力学数据,建立了幂级数反应动力学方程,采用非线性最小二乘法拟合得到模型参数,得到酯化反应的正逆反应活化能分别为33.8和61.7 k J/mol,异丁烯二聚反应的正逆反应活化能分别为42.7和91.6 k J/mol,实验测定值与模型计算值吻合较好。

Esterification reaction of acrylic acid with isobutene to tert-butyl acrylate over a mesoporous SO3H-SBA-15 was investigated to obtain its intrinsic kinetics for industrial scale-up. The kinetics data were collected in a batch tank reactor after eliminating the influences of external and internal diffusion with a stirring speed over 400 r/min and catalyst particle size between 0.15 and 0.18 mm. Based on the power law equation, the kinetics parameters were estimated by the nonlinear least square method. The activation energy of the forward and reverse esterification reaction are 33.8 and 61.7 kJ/mol, and that of the forward and reverse isobutene dimerization are 42.7 and 91.6 kJ/mol, respectively. The results agree well with the experimental data.