混合碳四全加氢催化剂第一次再生过程分析

ANALYSIS OF THE FIRST REGENERATION PROCESS OF MIXED C 4 HYDROGENATION CATALYST

混合碳四来自丁二烯抽提装置和MTBE装置生产的含炔碳四、炼厂轻烃回收装置生产的重碳四,该部分碳四经过全加氢饱和其中的烯烃和炔烃后可作为裂解原料。混合碳四中烯烃含量(摩尔分数)较高,通常占65%以上。随着装置运行,烯烃在反应器中聚合、结焦,长时间累积会堵塞催化剂孔道,造成催化剂活性下降,床层压差升高,影响产品质量和装置运行,需要停车再生催化剂。分析了再生过程,评价了再生结果,为装置后续运行提供了理论基础。

Mixed C 4 is mainly composed of the acetylene-containing C 4 from butadiene extraction plant and MTBE plant and the heavy C 4 from light hydrocarbon recovery unit in refinery.This part of C 4 components can be used as cracking materials after removing the olefins and alkynes by full hydrogenation.The olefins content of mixed C 4 is relatively high,generally accounting for more than 65 mol%.With the operation of the plant,the olefins will be polymerized and coking in the reactor,and then block the pore channel of the catalysts over time,resulting in the decrease of catalyst activity and the increase of bed pressure difference,which will affect the product quality and the operation of the plant.Therefore,the plant has to be shut down for catalyst regeneration.The regeneration process is analyzed,and the regeneration results are evaluated,providing theoretical basis for the subsequent operation of the plant.