异丁烯齐聚反应动力学研究

Study on reaction kinetics of isobutene oligomerization

用硅铝小球固体酸作催化剂,在排除了内、外扩散影响的基础上,利用高压微分反应器对异丁烯齐聚反应的动力学行为进行了实验研究.结果表明,异丁烯齐聚反应为快速液固相催化反应,在80 ℃～120 ℃,2.0 MPa的实验条件下,反应产物主要是异丁烯的二聚物和三聚物,且三聚物的收率远高于二聚物,两者的浓度比值随反应温度的升高而下降;少量四聚物的生成主要源于碳八烯烃与碳八正碳离子的反应.通过对反应动力学规律的分析,建立了齐聚反应的简化动力学方程.

By using the Silieon-Aluminum solid add catalyst,the reaction kinetics behaviors of isobutene oligomerization were studled in a high-pressure micro reactor under the conctition for eliminating inner and external diffusion resistance. The results slow that isobutene oligomerization is fast liquid-solid reaction. Under the temperature of 80 ℃～120 ℃ and pressure of 2.0 MPa, the products of oligomerization are mainly dimers and trimers of isobutene. The yield of trimers is higher than that of dimers and the mass fraction of trimers decreases with reaction temperature increasing. The yield of tetramers is much lower than that of dimmers and trimers, The tetramers are formed by reaction of isooctenes and C8 carbonium ion. The reduced kinetics equations of isobutene oligomerization are derived by theoretical analyses of the reaction mechanism and kinetics.