渣油加氢处理中沥青质组成和结构的变化研究

利用渣油加氢处理中试装置考察了温度和加氢深度对加氢产物渣油中沥青质组成、结构的影响，结果表明：随温度或加氢深度增加，加氢产物渣油中沥青质含量降低，沥青质中硫、镍、钒含量降低，氮含量呈增加趋势。采用13C-NMR谱和1H-NMR谱，计算了沥青质的平均分子结构参数，结果表明：随着温度的升高，饱和碳分率逐渐下降，芳香碳分率逐渐升高；随着加氢深度增大，饱和碳分率逐渐升高，而芳香碳分率逐渐下降。

STUDY ON THE CHANGING OF COMPOSITION AND STRUCTURE OF ASPHALTENE DURING RESIDUE HYDROTREATING

Residue oil hydrotreating experiments were carried out on a pilot plant unit to investigate the effect of reaction temperature and hydrotreating severity on the composition and the molecular structure of asphaltenes in the treated residue samples.Results showed that with the increase of reaction temperature or the depth of hydrogenation,the asphaltene content in the treated residue sample decreased;the sulfur,nickel and vanadium contents of asphaltene dropped,but the nitrogen content gave an increase trend.The average molecular structural parameters of asphaltene in the obtained samples were calculated from the spectrum of 1H-NMR and 13C-NMR.Results showed that with the increase of reaction temperature,the fraction of paraffins decreased and the fraction of aromatics increased;however,with the increase of hydrogenation depth,the fraction of paraffins increased and the fraction of aromatics decreased.