掺炼减压渣油对催化裂化油浆减压蒸馏过程的影响

Effect of blending vacuum residue on FCC slurry vacuum distillation process

在实沸点装置上对掺炼一定比例减压渣油(减渣)的催化裂化油浆(催化油浆)进行馏分切割,考察减渣对催化油浆拔出馏分性质的影响。结果表明:混合油A和混合油B拔出的窄馏分实际收率明显高于加权值,说明减渣组分可能进入到拔出馏分油中;减压蒸馏处理后,470℃以下各个窄馏分的灰分均低于0.01%,催化油浆掺炼减渣使得500℃以上残油馏分的灰分从1.833%降到0.392%;催化油浆中的硫在350℃以上各个窄馏分中基本均匀分布(其质量分数为0.98%~1.02%),混合油A中500℃以下的拔出窄馏分中硫质量分数为0.72%~2.42%,混合油B中500℃以下的硫质量分数为0.78%~2.75%,并且随着馏分越重,硫含量越高;从组成方面来看,与催化油浆相比,混合油A和混合油B拔出窄馏分的胶质+沥青质质量分数提高0.5%~4.4%;380~410℃馏分饱和分质量分数提高8%以上,芳香烃质量分数降低约10%;从族组成方面来看,掺渣后350~500℃各个窄馏分的单环和双环芳烃含量均提高;在低沸程区域,减渣组分对三环至五环芳烃含量提高起到促进作用,在高沸程区域效果相反。

The FCC slurry blending with VR(vacuum residue) is cut using the true boiling point distillation unit to investigate the effect of VR on the properties of the extracted fraction of FCC slurry. The results show that the actual yield of narrow fraction of mixed oil A and mixed oil B is significantly higher than the weighted value, indicating that the component from VR may enter the extracted distillate. After vacuum distillation, the ash of each narrow fraction below 470 ℃ is less than 0.01%, and the ash of residual oil above 500 ℃ is decreased from 1.833% to 0.392% due to blend with VR. Sulfur in narrow fractions above 350 ℃ of FCC slurry is basically evenly distributed, mass fraction is from 0.98% to 1.02%, while the sulfur mass fraction in narrow fraction of mixed oil A is from 0.72% to 2.42%, and from 0.78% to 2.75% in mixed oil B, which increases with fraction heavier. In terms of composition, compared with FCC slurry, the mass fraction of gum and asphaltene in the narrow fraction of mixed oil A and mixed oil B is increased by 0.5%~4.4%, and the mass fraction of saturate of the 380~410 ℃ fraction is increased by more than 8%, and the mass fraction of aromatic is decreased by about 10%. In terms of group composition, the contents of monocyclic and bicyclic aromatic hydrocarbons in the narrow fraction of the 350~500 ℃ are increased after blending with VR. The component from VR promotes the increase of the content of tricyclic to pentacyclic aromatic hydrocarbons in the low boiling range region, but the effect is opposite in the high boiling range region.