关键词: 沥青质, 渣油热转化, 钒, 核磁共振

Abstract:

Taking residue oil from TaHe as the object of the research, n-hexane as solvent to obtain asphaltene which was mixed with the residue oil to prepare the feedstock with different asphaltene content for autoclave hydrothermal conversion experiments. The characteristic of the reaction was analyzed by thermogravimetric analyzer and the structural differences of the unsaturated products were investigated by 1H-NMR and 13C-NMR. The results showed that asphaltene was the component that had a low thermal reaction activity. With the asphaltene content increasing, the yield of coke and gas presented linear increase, Sa* got the maximum value of 55.04% with 30% asphaltene content. In addition, various types of hydrogen and carbon content of cleavage products showed that with the asphaltene content increased, the break off of alkyl side chains and opening of naphthenic rings of the unsaturated components, which increased the content of aromatic hydrogen (HA) and hydrogen in the α-position to aromatic ring (Hα), the saturated carbon fraction f(CS) in Ar*, Re* and As* showed a significant decreasing trend, while the aromatic carbon fraction f(CA), co-bicyclic aromatic carbon fraction f(CAA) and tricyclic aromatic carbon fraction f(CAAA) showed a significant increase.

Key words: asphaltene, residue thermal cracking, vanadium, NMR