催化裂化催化剂铁中毒问题剖析

针对国内某炼油厂重油催化裂化装置因受加工重质、劣质原料油的影响,催化剂出现严重铁中毒的情况,从平衡剂和产品分布两个方面剖析了工业生产中的铁中毒现象.通过关联平衡剂铁含量与平衡剂物性发现,铁含量高会造成平衡剂堆密度下降,但铁含量与平衡剂的比表面积和孔体积变化的关联性较差.通过关联平衡剂铁含量与产品分布发现,催化剂铁中毒会...

ANALYSIS ON IRON POISONING OF FCC CATALYST

In view of the serious iron poisoning of the catalysts in heavy oil catalytic cracking unit of a domestic refinery due to influence of processing heavy, inferior feedstock and bottom oil, the typical iron poisoning phenomenon in industrial production was analyzed from the property of equilibrium catalyst(E-cats) and products distribution, and the iron content of the E-cats was analyzed. The results showed that a high amount of iron pollution would decrease the bulk density of E-cats, and the correlation between iron content and the specific surface area and pore volume of E-cats was poor. It was found that the iron poisoning of catalyst could increase the yield of slurry and dry gas and decrease the yield of light oil, and that there were many depressions and grooves on the surface of the iron poisoning E-cats. The iron content in the depressions was relatively high, and the iron was mainly concentrated on the outer surface of the catalyst particles. Based on the above research results, some suggestions were provided for the device to process high-iron content feedstock. Among them, the use of a catalyst with better iron resistance can greatly solve the problem of iron poisoning.