Study On Utilization Of Coal Liquefaction Residues And Extraction Of Aromatic Hydrocarbons From Coal Liquefaction Light Oil

The experiments on the hydrogenation and gasification reactivity of Shenhua coal liquefaction residues and the aromatic hydrocarbons extraction of coal liquefied light oil were performed. The effects of reaction times, reaction temperatures and initial H2 pressures on the hydrogenation conversion of coal liquefaction residues were investigated using a high pressure micro-reactor. The results showed that at the initial H2 pressure of 6MPa, the optimum reaction temperature and reaction time were respectively 470℃and 30min, where the conversion of PAA into oil and gas was up to 41.59%. When the initial H2 pressure decreased from 6MPa to 3MPa, the conversion of PAA presented an obvious decrease. The steam gasification reactivity of chars from Shenhua coals and Shenhua coal liquefaction residues was investigated. It was found that the reactivity of chars from Shenhua coals was obviously higher than that from Shenhua coal liquefaction residues.Shenhua coal liquefaction oil could be separated into distillation A, distillation B and distillation C by the way of the atmospheric and vacuum distillation. The contents of aromatic hydrocarbons from distillation B and distillation C were71.03% and 46.57%, respectively. The effects of solvents type, ratio of solvent to oil, extraction temperature and mixed solvent on the extraction of distillation B and distillation C were examined systematically. It was concluded that sulfolane presented a good extraction performance on the above two distillations. The temperature hardly affected the extraction in the experimental temperature range (40-60℃). The extraction performance of mixed solvents with sulfolane and furfural was superior to that of sulfolane solvents. For distillation B, the extraction performance of sulfolane solvents containing waters (0.5-1.0%) was superior to that of sulfolane solvents without waters.