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Ⅱ.单烯烃烯烃及其再加工我们知道在粗的石油原油或天然气内并不含烯烃,但在各别石油馏分热裂可以副产它们。还应指出,用一氧化碳和氢反应合成碳氢化合物时也大量生成有这样的极富于反应的碳氢化合物。现在热裂法是烯烃工业制备及再加工的主要来源。石腊碳氢化合物分裂为低级烷烃或烯烃的反应须在高温进行,全部热裂时可用也可不用催化剂。
II. Monoolefins and Reprocessing We know that they do not contain olefins in crude petroleum or natural gas, but they can be byproduced by thermal cracking of individual petroleum fractions. It should also be pointed out that the use of carbon monoxide and hydrogen to synthesize hydrocarbons is also abundantly produced with such highly reactive hydrocarbons. Thermal cracking is now the main source of olefins for industrial preparation and reprocessing. The reaction of paraffinic hydrocarbons into lower alkanes or olefins should be carried out at elevated temperature, with or without catalyst for all hot cracking.