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烯烃,二烯烃,烯基芳烃(如苯乙烯)是合成橡胶,塑料等的重要单体,一般是从相应的较饱和的烃类直接脱氢而获得,六十年代以来有大量文献报导研究氧化脱氢。氧化脱氢反应是部分氧化碳氢分子中的H 而不破坏碳氢骨架。烃类直接脱氢为可逆过程,受热力学平衡的限制。烃类直接脱氢的反应式:C_nH_(2n+2)(?)C_nH_(2n-2)+2H_2C_nH_(2n)(?)C_nH_(2n-2)+H_2若在反应中加入“氢的接受体”如 O_2,卤素,含硫化合物等可使反应朝有利于生成烯烃、二烯烃的方向进行,因而可提高脱氢产物的选择性和收率。烃类氧化脱氢的反应式为:
Olefins, diolefins, alkenyl aromatics such as styrene are important monomers for elastomers, plastics and the like, and are generally obtained by direct dehydrogenation of the corresponding more saturated hydrocarbons. There have been numerous literature reports since the 1960s on the oxidation Dehydrogenation. Oxidative dehydrogenation is the partial oxidation of H in hydrocarbon molecules without destroying the hydrocarbon backbone. Hydrocarbon dehydrogenation is a reversible process, limited by thermodynamic equilibrium. Hydrocarbon direct dehydrogenation reaction: C_nH_ (2n +2) (?) C_nH_ (2n-2) + 2H_2C_nH_ (2n) (?) C_nH_ (2n-2) + H_2 If the reaction by adding “hydrogen acceptor ”O 2, halogen, sulfur compounds and so on can make the reaction favor the formation of alkenes and diolefins, thus improving the selectivity and yield of dehydrogenation products. The reaction equation for the oxidative dehydrogenation of hydrocarbons is: