Study On Effect Of Solvent In Coal/Oil Co-processing

This paper selects Shengli vacuum residue(SLVR) and Shenfu coal as materials of co-processing, through the research on different reaction conditions on the influences of the reaction of co-processing, identified the optimum reaction conditions of co-processing of SLVR and Shenfu coal and the Synergistic effect of co-processing under the optimum reaction conditions. Investigated effect on co-processing reaction by adding tetraline, methylnaphthalene, anthracene and pyrene, analysis the effection of different aromatic compounds in the co-processing. Using response surface methodology to optimize the reaction conditions of co-processing in order to further improve the conversion rate of co-processing.Within the scope of this paper, through the analysis of factors such as co-processing conversion rate and product distribution, determined the co-processing reaction conditions of SLVR and Shenfu coal:420℃,6MPa,60min, the amount of catalyst is2%(ω), mass ratio of VR and coal is2:1. under the conditions there is a certain synergy between the SLVR and Shenfu coal, compared with no synergy the conversion rate and the oil production rate improved by5.0%and6.1%from72.2%and52.6%, and asphaltenes, gas production rates lowered by0.5%and0.6%from14.6%and5.0%. When takeing four components of SLVR as liquefaction solvents of Shenfu coal, the effect of aromatics, saturates, resin and asphaltene get weakened in turn.Investigating the effection of adding aromatic compounds with different structures (both10%, the same below) on co-processing reactions and found that anthracene has a good match whit Shenfu coal, and the conversion rate of treatment reach88.2%, compared with adding tetraline, methylnaphthalene, pyrene, it increased by2.7%,3.9%and3.3%. Although co-processing conversion rate of adding tetraline is lower than anthracene, oil selectivity of co-processing reached81.5%, compared with adding anthracene, methylnaphthalene, pyrene increased by2.2%,3.8%and3.4%. Using anthracene and tetraline at a mass ratio of1:1, the co-processing conversion rate rise up to89.1%from88.2%compared to add anthracene separately, at the same time, the co-processing conversion rate rise up to83.0%from81.5%compared to add tetraline separately. Adding mixed aromatics (anthracene and tetraline mass ratio of1:1, the same below)showing a good deal of synergy effects, compared to no synergistic he conversion rate and the oil production rate improved by 13.3%and16.8%from75.8%and57.1%, and the asphaltenes, gas production rates loweredby2.4%and1.1%from14.1%and4.6%. The difference between adding mixed aromaticcompound product compared and other aromatic compounds is mainly in the different levelsof light oil fractions, particularly in diesel fraction.Using the Response Surface Methodology to optimize the co-processing reactionconditions of SLVR and Shenfu coal with aromatic compounds, after optimized the reactionconditions is422℃,6MPa,62min,catalyst added2%（ω）, residual oil and coal mass ratio of2.15:1. Conversion rate of the co-processing increased to89.5%from89.1%and thesynergistic effect of co-processing has been further improved under the optimized reactionconditions.