甲醛和异戊烯普林斯（Prins）缩合反应的动力学研究

摘要

以强酸性阳离子交换树脂为催化剂，对甲醛和异戊烯普林斯（Prins ）缩合反应的动力学进行了研究。在间歇反应器内保持2.0 M Pa的压力，在反应温度60～100℃的条件下，甲醛和异戊烯发生Prins缩合反应生成4，4，5-三甲基-1，3-二氧杂环己烷。根据合理假设提出动力学模型，采用非线性回归的方法对实验数据进行拟合，确定反应级数及各项动力学参数。结果表明，随着反应温度增加，正、逆反应速率常数均增加；计算得出正、逆反应的活化能分别为31．74、85．04 kJ/mol。正、逆反应的指前因子分别为6．866×103、3．75×1010，从而得到反应动力学模型。%The Prins condensation intrinsic kinetics of formaldehyde with isopentene was studied with the strong acidic cation-exchange resin as catalyst .The formaldehyde react with isopentene under 2 .0 MPa of N2 pressure and at 333~373 K in a batch reactor .The kinetic model was put forward with a reasonable assumption .The kinetics parameters were obtained using non-linear regression methods .The results show that the positive reaction rate constant and the reverse reaction rate constant are both increased when the reaction temperature increasing .The activation energy is determined as 31 .74 kJ/mol for the positive reaction and 85 .04 kJ/mol for the reverse reaction .The pre-exponential factors of the positive reaction and the reverse reaction is respectively 6 .866 × 103 and 3 .75 × 1010 ;the kinetic model is simulated .