克拉玛依渣油悬浮床加氢尾油溶剂脱沥青研究

克拉玛依渣油悬浮床加氢尾油金属、残炭及沥青质含量很高，难以直接催化加工。围绕其合理加工利用问题，在超临界流体萃取分馏的基础上，用连续式溶剂脱沥青装置将尾油进行梯级分离，得到轻脱油、重脱油和脱油沥青。考察了温度和压力对脱沥青油收率及性质的影响，计算了杂质的脱除率，提出了用超临界萃取分馏结果预测连续式脱沥青油中残炭及镍含量的关联式。结果表明，在轻脱油收率为52.2％，总脱沥青油收率为84.7％时，连续式溶剂脱沥青对金属的脱除率达到99.5％，残炭脱除率达60.0％，轻脱油总金属含量仅为8.7μg/g，残炭为4.49％。

STUDY ON SOLVENT DEASPHALTING FOR SLURRY-BED HYDROCRACKING BOTTOMS OF KARAMAY ATMOSPHERIC RESIDUE

A series of deasphalting experiments using n-pentane as solvent were carried out in a two-stage continuous solvent-deasphalting pilot plant based on the supercritical fluid extraction and fractionation (SFEF) experiments. The influence of pressure and temperature on the yields and properties of deasphalted oil (DAO) was discussed and the removal rates of CCR and metal impurity were calculated. Correlation formulas using SFEF results to predict the contents of CCR and Ni of the continuous solvent-deasphalting DAO were proposed. Results showed that when the yields of light DAO and total DAO were 52.2% and 84.7%, respectively, the removal rates of CCR and metal impurity reached 60.0% and 99.5%, respectively. In light DAO, the contents of total metals and CCR were 8.7 μg/g and 4.49%, respectively, it was a good FCC feedstock. The heavy DAO could be used as hydrocracking feedstock.