| The resource low-rank coal was abundant in China,the development of new type low rank coal fractionation conversion was used.The technology for its high efficiency and high value utilization has great significance.This paper studied the fractional Preparation method of the thermal extracts from Xilinguole Lignite the was analyzed and characterized.The ZSM-5 zeolite molecular sieve was constructed by alkali treatment,focusing on the hydrogenation cracking of the fractional of coal thermal extracts performance of mesoporous ZSM-5 and Ni/ZSM-5 catalysts,hydrocracking products further hydrogenation preparation rich in aromatic ring cycloalkanes and hydrogenation of aromatics for high performance jet fuel.Through the reaction of catalyst characterization results and model compounds,the catalytic mechanwasm of thermal extracts preparation of jet fuel was analyzed.The results show that:(1)According to the characteristic of soluble substances at room temperature and deposition by thermal treatment,N,N-dimethyl formamide(DMF)had an effective extraction separation on deposition extracts at room temperature,and a fractional extraction method of soluble and deposition of lignite high-temperature extracts at room temperature was proposed.High-temperature extracts solvent and secondary high-temperature extraction processing affected lignite classification of extracts yield and distribution,the key factors were: 1-methyl naphthalene containing 10wt% methanol,extracts yield had been greatly improved,increased from 21.9% to 33.3%,increased by about 52.1%.Soluble substances and deposition at room temperature of the thermal extracts ratio increased from 1.03 to 1.64,increased by about 59.2%.In the twice thermal extraction process,extracts yield increased by 33.3% to 57%,increased by about 71%.In secondary high-temperature extraction processing,coal extracts yield increased from 33.3% to 57%,increased by about 71%.Soluble in room temperature of sedimentary coal extacts content was increased by 1.62 to 2.52,increased by about 54%.FTIR and elemental characterization results showed that the high-temperature extraction processing had the great effects on mineral ash desorption,at the same time,the coal high-temperature extracts oxygen content was reduced.(2)Ultrasonic treatment put up conspicuous promotion for the yield of fractional extractive of coal.Hot-melt solvent and twice hot melt processing were also the critical factors in the yield fractional extractive of lignite: the total yield was enhanced from 21.9% to 30.4% by an increasing rate of 39% when 1-Methylnaphthalene as solution but dramatically rise from 33.3% to 52.3% at 57% growth rate.Otherwise,these two methods show the same fractional extractive distribution.The ambient temperature solute and sediment in extracts from coal after ultrasonic processed had a specific value of 1.65 which was similar to the value 1.64 of mechanical agitation processing.The overall yield of extractant was sharply increased from 57% to 82.4% when twice hot melt was treated in ultrasonic method.In addition,the ratio value of solute and sediment at room temperature was 2.85 which obviously improved compared with 2.52 in the method of mechanical stirring.Additionally,it showed similar structual characteristics between two processing methods.(3)The pore structure,acid and hydrogenation active components of catalyst,which had certain synergy,differed greatly in the hydrocracking performance in the fractional of the thermal extracts.Ni was introduced to promote the hydrocracking performance of the catalyst,especially in the yield of oil.The oil yield of microporous Ni / ZSM-5 catalyst increased from 30.2% to 45.3%,compared with that of ZSM-5,increased by nearly 50%.The oil yield of multiple channel Ni / ZSM-5 catalyst increased from 30.5 % to 57.4%,increased by nearly 90%.Different pore structure of ZSM-5 in catalyst systems(whether introduced into a hydrogenation active component)had different influences.For the ZSM-5 catalyst system without Ni supported,the pore structure had little effect on its properties.For a Ni/ZSM-5 catalyst system that introducd hydrogenated active components,the multiple channel has a great effect on the hydrocracking performance of lignite at room temperature.Compared to H-type microporous Ni / ZSM-5 catalysts,the oil yield increased from 45.3% to 57.4%,increased by 27%.The acidity of the catalyst had the same promotion effects on the fractional of the thermal extracts at room temperature.the oil yield of Na-type multiple channel Ni / ZSM-5 catalyst was only 35.1%,it was much lower than 57.4% of H-type multiple channel Ni/ZSM-5 catalyst 57.4% and lower than 45.3% of microporous Ni / ZSM-5 catalyst.The mesoporous pore structure was beneficial to the recycling stability of the Ni/ZSM-5 catalyst.(4)The hydrocracking products of coal thermal solution are mainly bicyclic aromatic compounds,and jet fuels withrich naphthenes and hydrogenated aromatics could be produced by hydrogenating the saturated aromatic ring.The different preparation methods have different effects on the hydrocracking performance of the classified coal thermal solution,the hydrocracking performance of coal thermalsolution produced by mechanical stirring and ultrasonic assisted treatment is not far from each other,but different thermal solvent has a great influence on the hydrocracking performance.The GC-MS analysis of the hydrocracking products showed that the peak area ratio of the bicyclic aromatic hydrocarbon compound was 94.1%,and the aromatic ring in the bicyclic aromatic hydrocarbon compound was still in the form of unsaturated aromatic ring.The hydrothermal pyrolysis products of the coal were further hydrotreated by the Cu-Ni / γ-Al2O3 catalyst,and the aromatic ring in the bicyclic aromatic hydrocarbon compound was hydrogenated,the cycloalkane and hydrogenated aromatic hydrocarbons accounted for 61.9% of the total product.A jet fuel containing richnaphthenes and hydrogenated aromatics can be produced. |
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