Solvent deasphalting of vacuum residue using carbon dioxide-toluene mixture was studied to assess the effect of the process parameters and mixture composition on the yield and composition of deasphalted oil (DAO) produced. An insignificant effect of the toluene content in the mixture on the DAO yield was found at a concentration above 30 wt.%, which was attributed to effective anti-solvent properties of carbon dioxide. At relatively low-pressure region, an increase in temperature and the transition of the mixture to the supercritical state led to a rapid decrease in the solvent density and the DAO yield. At the same time, at pressures providing a mixture density in the region above ∼0.6 g/mL, an increase in temperature above the mixture critical value was accompanied by increasing the DAO yield, even despite a noticeable decrease in the solvent density. However, conducting the extraction at temperatures near and beyond the mixture critical temperature reduces the separation selectivity at close the extraction yields due to increased solubility of metal-containing polar compounds. A proposed mixture in the single-phase liquid state can provide high DAO quality with metal and CCR removal efficiency of more than 90 and 80 wt.%, respectively.

研究了使用二氧化碳-甲苯混合物对减压渣油进行溶剂脱沥青，以评估工艺参数和混合物组成对生产的脱沥青油（DAO）的收率和组成的影响。发现混合物中甲苯含量对DAO产率的影响不显着，其浓度高于30重量％，这归因于二氧化碳的有效抗溶剂性能。在相对低压的区域，温度的升高和混合物向超临界状态的转变导致溶剂密度和DAO收率迅速下降。同时，在高于约0.6 g / mL的区域内提供混合物密度的压力下，高于混合物临界值的温度升高伴随DAO产量的增加，即使溶剂密度明显降低。然而，由于含金属的极性化合物的溶解度增加，因此在接近和超过混合物临界温度的温度下进行萃取降低了接近萃取产率的分离选择性。所提出的单相液态混合物可以提供高的DAO质量，并且金属和CCR的去除效率分别超过90和80 wt。％。