METHOD FOR PRODUCING OLEFINS BY MEANS OF THERMAL STEAM CRACKING IN CRACKING FURNACES

摘要

The present invention relates to a process for converting a hydrocarbon raw material by thermal steam cracking to at least one olefin-containing product stream comprising at least ethylene and propylene, the first hydrocarbon raw material in at least one first cracking furnace (1) And at least partial conversion of the second hydrocarbon raw material in at least one second cracking furnace 2. According to the invention, the second hydrocarbon feedstock is converted in a second cracking furnace (2) with cracking conditions leading to a ratio of propylene to ethylene of 0.7 to 1.6 kg / kg, the first hydrocarbon feedstock being 0.25 to The value for the ratio of propylene to ethylene to the second hydrocarbon raw material is converted in the first cracking furnace (1) with the decomposition conditions leading to a ratio of propylene to ethylene of 0.85 kg / kg, and the value for the ratio of propylene to ethylene to the first hydrocarbon raw material is Greater than the value for the proportion of ethylene.