甲醇制烯烃反应催化剂再生动力学研究

采用甲醇制烯烃(MTO)装置工业实测数据,对失活SAPO-34催化剂的烧炭再生动力学模型进行研究。建立了SAPO-34催化剂再生的宏观动力学模型,对模型中的动力学参数进行求取,结果与文献值接近,并用不同的数据进行验证,得到再生剂上炭浓度的计算值与实测值的相对误差在5%以内,表明该宏观动力学模型是可靠的。忽略催化剂外扩散的影响,根据失活的SAPO-34催化剂的结构性质,运用反应工程原理求得失活SAPO-34催化剂的内扩散有效系数为0.85,表明内扩散影响比较明显,若要提高烧焦效率,必须设法降低内扩散对反应速率的影响。

Regeneration kinetics of catalysts for methanol to olefin reaction

The regeneration kinetic models of deactivated SAPO-34 catalyst have been studied based on the commereial operating data. An apparent kinetic model has been established and the parameters of the mod- el have been obtained, which are similar to those in literature. Different data have been used to verify the model. The relative errors of the coke concentration on the regenerated catalyst between calculated values and measured values are less than 5 % ,indieating that the model is reliable. Without eonsideration of the impact of external diffusion on catalyst and in accordance to the structure features of the deactivated SAPO-34 catalyst, 0.85 internal effective diffusion factor is obtained based upon the chemical reaction engineering principles, showing that the internal diffusion impact is obvious. To improve the coke burning efficiency, measures should be taken to reduce the impact of the internal diffusion on reaction rate.