| 摘要 |
The invention relates to a method for converting hydrocarbon feedstocks by means of thermal steam cracking to form at least one olefinic product flow which contains at least ethylene and propylene, wherein a first hydrocarbon feedstock is at least partially converted in at least a first cracking furnace (1) and a second hydrocarbon feedstock is at least partially converted in at least a second cracking furnace (2). According to the invention, the second hydrocarbon feedstock contains predominantly hydrocarbons with a carbon number of 5 and/or 4 and largely comprises one or more returned fractions (P, T), which are obtained from the product flow, and the second hydrocarbon is converted in the second cracking furnace (2) under crack conditions, which lead to a propylene to ethylene ratio of 0.7 to 1.6 kg/kg. |
