增烯助剂的偏土分散制备法及其反应性能研究

Preparation and Properties of Additives for Increasing Olefins by Metakaolin Dispersing Method

在FCC装置添加FCC助剂来增加轻质烯烃产率,是炼化企业获得轻烯烃的重要途径,因此制备高效增烯助剂有重要现实意义。本文通过改进ZSM-5分子筛粒子的分散性来改善FCC增烯效果,利用激光粒度仪、BET和固定流化床反应性能评价等手段对样品进行了测试。研究结果表明,采用中位径3.2μm偏高岭土粒子作为促进剂,可促进浆液中ZSM-5分子筛聚集态粒子的分散;采用MK分散法制备的ZSM-5分子筛,可制备出综合性能较好的增烯助剂,能使FCC液化气中的烯烃提高近3个单位。

Refiner obtaining more light olefins by using additives in FCCU was a practiced signifience. To improve the effect of ZSM-5 additive by improving the dispersion of ZSM-5 particles was related. The samples were tested by laser particle size analyzer,BET and the fixed bed FCC evaluation. The experiment results show that the median diameter of 3. 2 μm metakaolin as particle accelerator,may promote the dispersion of aggregated ZSM-5 particles in the slurry. Using above dispersed slurry containing ZSM-5 as raw material,the FCC additive microspheres for increasing light olefins was obtained by spray granulation method. This FCC additive has good effect for increasing olefins： increasing nearly 3percentage points of olefins in liquid petroleum gas.