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研究了由预加氢多环芳烃热裂化制取单环芳烃。描述了在700—900℃和常压下,于氮气流(作为惰性载气)中及在反应器内停留时间为0.5秒的条件下,热解1,2一二氢化萘,全氢化萘和全氢化茚所得的研究结果。萘烷(全氢化萘)裂化可得到很高产率的苯、甲笨、二甲苯(BTX)(达30%,以重量计)。乙烯的产率在20%以上,甲烷的产率为15—20%。可是,由萘仅部分加氢生成的1,2—二氢化萘或萘满,热解所得的苯和其他轻芳烃的产率都很低。主反应是萘的脱氢和重整。业已证明,萘完全加氢就可使它的两个环之一在750—850℃下发生断裂,并同时生成显著量的乙烯和轻芳烃。在全氢化茚和其他完全加氢多环芳香化合物的热解反应中也观察到相同的现象。因此,可以断定,完全加氢可使环的稳定性(这是多环芳烃的特征)消失。所得研究结果的工业兴趣在于:由煤加氢生成的全氢化多环芳香化合物可同时制取轻芳烃和乙烯。
The preparation of monocyclic aromatic hydrocarbons by thermal cracking of pre-hydrogenated PAHs was studied. Describes the pyrolysis of 1,2-dihydronaphthalene, perhydronaphthalene, and 1,3,5-trihydroxybenzene at 700-900 ° C under atmospheric pressure in a stream of nitrogen (as an inert carrier gas) and for a residence time in the reactor of 0.5 seconds, Hydrogenated indene derived from the research results. Cracking of decalin (perhydronaphthalene) yields very high yields of benzene, methylbenzene, xylene (BTX) (up to 30% by weight). The yield of ethylene is above 20% and the yield of methane is 15-20%. However, the yield of 1,2-dihydronaphthalene or tetralin from only partial hydrogenation of naphthalene and from pyrolysis of benzene and other light aromatic hydrocarbons is very low. The main reaction is naphthalene dehydrogenation and reforming. It has been shown that complete naphthalene hydrogenation can cause one of its two rings to break at 750-850 ° C while producing significant amounts of ethylene and light aromatic hydrocarbons. The same phenomenon was also observed in pyrolysis reactions of perhydroindenes and other fully hydrogenated polycyclic aromatic compounds. Therefore, it can be concluded that complete hydrogenation can annihilate the stability of the ring, which is a characteristic of PAHs. The industrial interest in the results obtained is that perhydropolicylic polycyclic aromatic compounds derived from the hydrogenation of coal can simultaneously produce light aromatic hydrocarbons and ethylene.