沥青质含量对渣油加氢转化残渣油收率和性质的影响

Influence of asphaltene content on yield and properties of hydrotreated residue

以塔河常渣脱沥青油掺兑不同含量的沥青质为原料,于高压釜反应器内进行加氢转化反应实验,考察沥青质含量对渣油加氢转化残渣油收率和性质的影响。研究结果表明,随原料中沥青质含量的增加,加氢残渣油的收率逐渐降低,加氢残渣油中的沥青质和焦炭产量之和与原料中沥青质含量的比值逐渐减小,在实验选定的条件下,高沥青质含量时沥青质更倾向于发生氢解反应生成小分子组分。与原料相比,反应后所得>350℃残渣油的平均相对分子质量、H/C摩尔比减小,密度增大,硫含量降低,氮含量增加,饱和分和沥青质含量增加,芳香分及胶质含量降低。随渣油中沥青质含量的增加,硫、氮脱除率先增加后降低。

The influence of asphaltene contents on the yield and properties of hydrotreated residue was studied in an autoclave by using the residue of Tahe deasphalted oil（DAO） mixed with different contents of asphaltene.The results show that the yield of hydrotreated residue and the ratio of the asphaltene in hydrotreated residue plus coke to the asphaltene in feedstock decrease with the increasing of asphaltene content.The asphaltene can be converted to light oil more easily at the selected reaction conditions when the asphaltene content in feedstock is high.The molecular weight,the H/C mol ratio,the sulfur content,the aromatic fraction and the resin of the hydrotreated residue decrease.However,the density,the nitrogen content,the saturation fraction and the asphaltene increase for the hydrotreated residue.The removal rate of sulfur and nitrogen first increases and then decreases with the increasing of asphaltene content in feedstock.