关键词: 常压渣油, 脱沥青油, 结构参数, 加氢热转化

Abstract:

Using the atmosphere residue from TaHe (THAR) as the raw material, n-hexane as solvent to obtain C6-asphaltene and the deasphalted oil which was the feedstock for autoclave hydrothermal cracking evaluating experiments. The reaction characteristics of THAR and DAO were analyzed by thermogravimetric analyzer and the molecular structure parameters were systematically investigated by elemental analysis, FT-IR, 1H and 13C-NMR and GPC. The results showed that the carbon residues in 700 ℃of THAR and DAO were 15.77% and 3.70% respectively. Compared with THAR, DAO had a higher weight loss in the given temperature, which indicated that DAO had a higher thermal cracking activity, so that the light components were more easily released in the presence of heat. By solvent deasphalting, the molecular weight reduced dramatically and the aromacity, total rings, aromatic rings and Naphthenic rings decreased from 0.27 to 0.22,8.45 to 5.08, 5.94 to 3.16 and 2.51 to 1.92 respectively. The ratio of Aromatic rings to Naphthenic rings in THAR was 1.44 times that of DAO. The hydrothermal cracking results showed that the yield of gasoline and diesel for DAO were 22.57% and 42.26%, which were increased by 4.48 and 9.05 percentage points respectively, and the yield of coke was only 5.02, which was reduce by 18.64 Which was associated with high aromaticity, association number, and carbon residue, containing high levels of highly condensed aromatic hydrocarbon.

Key words: atmosphere residue, deasphalted oil, structural parameters, thermal cracking in hydrogen