核磁共振法研究渣油加氢生成油的结构变化

Structure Changes of Residue During Hydrotreating by NMR

通过核磁共振波谱(NMR)、元素分析和平均相对分子质量等方法研究了渣油在不同温度下的固定床加氢处理过程的结构和组成变化。结果表明,随着加氢深度的增加,渣油加氢生成油的平均相对分子质量、芳碳摩尔分数、总碳数(CT)、总氢数(HT)、芳香碳分率(fA)、芳香碳数(CA)、总环数(RT)以及芳香环数(RA)等结构参数也都呈明显的降低趋势,而氢碳原子数比逐渐升高。表明了经过加氢处理过程,渣油中部分较大的分子裂解并加氢,变成分子较小的组分,不饱和程度也得到了降低,渣油质量得到明显改善。

The structure and composition changes of residue and hydrotreated oils by fixed reactor under different temperatures were researched by NMR,elemental analysis and molecular weight determination,et al.The results show that the average molecular weight of the hydrotreated oils,mole fraction of aromatic carbon,total carbon numbers,total hydrogen numbers,fraction of aromatic carbon,aromatic carbon numbers,total ring numbers,and aromatic ring numbers decreased after the hydrotreating.Atom ratio of hydrogen to carbon gradually increased.Results suggested that heavy fractions are cracked to light fraction,degree of unsaturation decreased,and residue property is obviously improved after hydrotreating.