Influence of reaction temperature on the content and structure of four fractions in residue hydrotreating
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摘要: 以沙轻减渣为原料,在高压釜内研究了不同反应温度下加氢反应前后渣油的四组分含量及其结构组成变化。结果表明,加氢残渣油中的饱和分含量明显增加,而芳香分和胶质的含量均降低,四组分含量随反应温度的升高均呈现规律性变化。加氢后四组分的H/C摩尔比和平均相对分子质量均降低,芳碳分率增加。随反应温度升高,四组分的H/C摩尔比和平均相对分子质量降低,烷基碳分率降低;芳香分、胶质和沥青质的芳碳分率增加;胶质和沥青质的总环数和芳环数均降低。渣油加氢过程中四组分都发生了明显的氢解和脱烷基反应。加氢反应中,胶质和沥青质结构单元间的各种桥键可发生明显地断裂,导致其结构单元数减少,且结构单元数随反应温度的升高而减少。Abstract: The changes of the content and structure of four fractions in the vacuum residue of Saudi Arabia light crude oil (ALVR) pre- and post hydrotreating were investigated in an autoclave at different reaction temperatures. The results showed that after the hydrotreating, the saturate content is increased greatly, while the aromatic and resin contents are decreased in the hydrotreated residue; the contents of four fractions changes regularly with the increase of the reaction temperature. The H/C mol ratio and molecular weight of four fractions in the hydrotreated residue are decreased while the fraction of aromatic carbons (fa) is increased after the hydrotreating. With the increase of reaction temperature, the H/C mol ratio, molecular weight and the fraction of paraffin carbons (fp) of four fractions are decreased, while fa and the content of resin and asphaltene are increased in the hydrotreated residue; meanwhile, the total rings and aromatic rings of resin and asphaltene are decreased. The four fractions in the residue have undergone hydrogenolysis and hydrodealkylation during the hydrotreating. Bridge bonds between the units of resin and asphaltene may break by hydrotreating, leading a decrease of the unit number of resin and asphaltene, which is more prominent at higher reaction temperature.
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Key words:
- residue hydrotreating /
- reaction temperature /
- four fractions /
- content /
- structure change
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