| The characteristics of manufacturing fuel oils by catalytic pyrolysis of waste plastics, composed pyrolysis by waste plastics and heavy oils, catalytic transformation and the preparation of transforming catalyst were studied systemeticly hi this paper.Firstly, the characteristics of catalytic pyrolysis of waste plastics was studied. The temperature characteristic of catalytic pyrolysis of polyethylene, polypropylene, and polystyrene by the catalysis of CuO were also discussed. According to that, catalytic pyrolysis of waste plastics mixtures was carried out in different temperature range. The styrene monomers ,the light fuel oils and the heavy fuel oils were obtained in 0~360癈 > 360?60癈 and 460~520癈. The influence of pressure on the reaction was also studied. It was found that the yield rate of liquid fuel oils increases with decreasing pressure, and the optimal pressure of these three materials was 9 X 104Pa; For the same material, the turn of effects for different catalyst were gain as followed: CuO> AbOa > BaO> CaO; The influences of catalytic temperature on the yield of liquid fuel oils, gasoline, diesel, heavy oils, gas and carbon residue were discussed. The influences of catalytic pyrolysis on the yields of every product and the quality of gasoline in catalytic pyrolysis were compared with that of thermal pyrolysis. The quality of gasoline in catalytic pyrolysis was improved apparently.Secondly, the characteristics of composed pyrolysis by waste plastics and heavy oils were also studied. It cuts a new way to solve many problems in practical production, such as : coking and second pollution. When heavy oil was composed with polyethylene, or polypropylene, or polystyrene as material and the ratio is 1:1, the yield rate of liquid fuel oils came to the highest. The yield rate of gas would rise with the ratio rising, however, carbon residue was on the contrary. For the composed pyrolysis by heavy oils and polypropylene, the optimal temperature was 500 癈. The yield rate of gasoline and gas would rise with temperature rising, however, heavy oils and carbon residue were on the contrary. Comparing with thermal pyrolysis , composed pyrolysis could improve the quality of gasoline ,and the RON of it came to 78.56.Thirdly, composed pyrolysis was combined with catalytic transformation. The changes of every product in composed pyrolysis after catalytic transformation were studied. Polyethylene,polypropylene, polystyrene were in the optimal temperature of catalytic transformation 290 ℃ ? 315℃, 265 ℃, the yield rate of liquid fuel oils came to highest 81.65%, 88.50%, 87.40%.By the catalysis of FC catalyst, with the temperature of catalytic transformation rising, the yield of gasoline would rise ,however ,heavy oils and carbon residue were on the contrary. At the same transformation temperature, the turn of catalysis effects for three catalyst were gain as followed: FOGOR-OCC20D. when heavy oils and polypropylene were materials, by the optimum experiment ,optimum parameter of condition was gotten in the Catalytic transforming as followed: pyrolysis temperature 460℃, transformation temperature 350℃, the quantity of catalyst 40g, catalyst FC.Forthly, a new style transformation catalst - rare earth Zr catalyst was developed for practical production, the rare earth Zr catalyst whose carrier was powder A^Oa was gotten by co-precipitation. When compared the washing effects on gel with anhydrous alcohol,it was found that isopropyl alcohol was more propitious to make the gel dehydrate than the former. At burning temperature 300℃, the specific surface area of the catalyst came to the most 153.5m2/g. When temperature rose from 100℃ to 1300℃, the effective density of burning outcome rose from 2.49g/cm3 to 3.98 g/cm3, however, the density of loose loading and tighten loading would decrease at first, and then would rise up with the shaping of a - AliOs. By the catalytic experiment, at transforming temperature 290 ℃, using rare earth Zr catalyst I , the yield rate of liquid fuel oils came to the highest 86.1... |
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