Study On Methanol-solubilized And Dispersed Catalysts For Coal/Oil Co-hydroprocessing

In this thesis, the novel methanol-solubilized catalysts were prepared by dissolving the catalyst precursors in methanol and presulfurization. The catalytic activity of the methanol-solubilized catalysts was studied in Coal/Oil co-hydroprocessing. Then, the compatibility in co-hydroprocessing between different kinds of oil and coal was investigated with the different catalysts, and, the reasons of compatibility were also investigated. Finally, the coprocessing conditions were optimized and the optimal conditions for co-hydroprocessing were found.It was found that the particle size of nickelic and ferric sulfides from novel methanol-solubilized catalysts were smaller and more symmetrical than the traditional water-solubilized catalysts. The average size of nickelic and ferric sulfides catalysts was about 50 nm and 120 nm respectively. The novel methanol-solubilized catalysts could hasten the transformation of preasphaltene from coal, it could absolutely be used in Coal/Oil co-hydroprocessing.Among the three heavy oils and the two coal samples,Neimeng lignite and Du-84 were the best feed for co-hydroprocessing. The optimization of reaction conditions showed that reaction temperature, reaction time, hydrogen pressure and the ratio of coal had great effect on co-processing reaction. Firstly, a high temperature or a long time was unfit for co-hydroprocessing. Under the conditions of this experiment, proper temperature for reaction should be 420℃and reaction time should be 60min. Secondly, higher original hydrogen pressure could promote the hydrogenation of co-hydroprocessing, inhibit catalyst aggregation and the catalytic deactivity, decease polycondension reaction of the low-molecule component by hydrocracking of coal. Thirdly, the higher the ratio of coal in the feed, the more difficult the liquefaction was.