催化裂化装置处理高硅石脑油的研究与工业实践

RESEARCH AND INDUSTRIAL PRACTICE ON THE TREATMENT OF HIGH SILICON NAPHTHA IN FCC UNIT

为了防止石脑油中的硅对加氢工序和重整工序使用的催化剂造成危害,提出了一种催化裂化流化床处理高硅石脑油的方案。采用中型提升管试验装置对高硅石脑油进行脱硅处理,通过调整掺炼比例、反应停留时间和原料油性质初步确定工业试验工艺条件,并探究其反应机理;在中国石化天津分公司的2.80 Mt a催化裂化装置上进行了工业试验,进一步验证了此方案在石脑油脱硅方面的效果。研究结果表明:当高硅石脑油以终止剂的形式回炼、掺炼比例小于1%、反应停留时间大于3 s时,处理效果最佳。该方案具有极佳的石脑油脱硅效果,可避免使用捕硅剂或脱硅保护剂带来杂质污染的问题。

In order to prevent the silicon in naphtha from harming the catalysts used in hydrogenation and reforming processes,a scheme of treating high silicon naphtha in fluidized catalytic cracking unit was proposed.High silicon naphtha was desiliconized in a pilot riser unit.By adjusting the blending ratio,reaction residence time and feedstock properties,the industrial process conditions were preliminarily determined,and the reaction mechanism was explored.The industrial experiment was carried out in a 2.80 Mt a catalytic cracking unit of SINOPEC Tianjin Company,and the effect of this scheme on the desiliconization of naphtha was further verified.The results showed that when the high silicon naphtha was injected as terminator with the blending ratio less than 1%and the reaction residence time more than 3 s,the treatment effect was the best.The program has excellent desiliconization effect of naphtha and can avoid impurity pollution caused by using silicon catcher or desilication protector.