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在化学工业中,苯乙烯作为聚苯乙烯塑料和丁苯合成橡胶的单体,通常是由乙基苯催化脱氢过程来制造的。在该过程中一般采用复合的氧化铁催化剂,此类催化剂在高温(600—650℃)和大量水蒸汽(蒸汽与乙基苯的分子比约为15:1)存在下,可连续操作一年无须再生,其苯乙烯收率为35—40%,选择性为90—92%。尽管这种苯乙烯的生产方法已在工业上获得普遍的应用,但由于乙基苯的脱氢是一个强的吸热反应,为了提供这样的反应热,往往需要在反应物中加入大量的过热(710℃)蒸汽,或者在减少蒸汽用量下将反应器直接加热。显然,不论从经济或工艺观点来考
In the chemical industry, styrene is used as a monomer for polystyrene plastics and styrene butadiene rubber, usually by the ethylbenzene catalytic dehydrogenation process. In this process, a composite iron oxide catalyst is generally used. Such a catalyst can be continuously operated for one year in the presence of high temperature (600-650 ° C) and large amount of water vapor (the molecular ratio of steam to ethylbenzene is about 15: 1) Without regeneration, the styrene yield is 35-40% and the selectivity is 90-92%. Although this styrene production method has been widely used in industry, since the dehydrogenation of ethylbenzene is a strong endothermic reaction, in order to provide such heat of reaction, it is often necessary to add a large amount of overheating to the reactants (710 ° C) steam, or the reactor is heated directly with reduced steam usage. Clearly, from the economic or technical point of view