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轻烃转化过程中酸性分子筛催化剂失活的主要原因是积炭。积炭由反应物生成,其生成速率受分子筛的孔结构、酸性及反应操作条件影响。通过对积炭组分形成过程的分析,可以提出积炭形成的模型及限制分子筛催化剂积炭失活的一些方法和最佳化的再生条件。从失活催化剂上去除积炭,一般是在贫氧空气流下的氧化处理,由于积炭分子中大量的氢原子在低温下被氧化,防止分子筛分解的再生操作方法分为2个阶段:第一阶段低温,第二阶段高温,通过使催化剂在高温下避免与水蒸气接触而减少催化荆的分解。
The main reason for the deactivation of acidic molecular sieve catalyst during light hydrocarbon conversion is carbon deposition. Coke formation by the reactants, the formation rate of molecular sieve pore structure, acid and reaction conditions. Through the analysis of the formation of coke components, a model of coke formation and some methods to limit the deactivation of molecular sieve catalyst coke and the optimal regeneration conditions can be proposed. Removal of coke from the deactivated catalyst is generally an oxidation treatment under an oxygen-lean air stream. Since a large number of hydrogen atoms in the carbon deposit are oxidized at a low temperature to prevent decomposition of the molecular sieve, the regeneration operation method is divided into two stages: first Stage low temperature, the second stage of high temperature, through the catalyst at high temperatures to avoid contact with water vapor and reduce the decomposition of the catalytic Jing.