METHOD OF CONVERSION OF HYDROCARBON INITIAL MATERIALS THROUGH THERMAL STEAM CRAKING Russian patent published in 2017 - IPC C10G9/36 

FIELD: chemistry.

SUBSTANCE: invention relates to a method of conversion of hydrocarbon raw materials by thermal cracking of steam with the receipt contains th7e olefins product flow containing at least ethylene and propylene, with at least partial conversion of the first hydrocarbon source material at least one cracking furnace (1) and the second hydrocarbon source material for at least one second-cracking furnace (2). The process is characterized in that the second hydrocarbon feedstock mainly comprises hydrocarbons having a carbon number of 5 or 4 and is for the most part composed of one or more recirculated fractions (P, T) which are obtained from the product stream. The second hydrocarbon is converted into a second cracking furnace (2) under cracking conditions which result in a propylene to ethylene ratio of 0.85 to 1.6 kg/kg, the first hydrocarbon feedstock comprising at least one fraction (U), which has been separated from the product stream and recycled, containing mainly hydrocarbons having a carbon number of at least 6, the first hydrocarbon feedstock is converted in the first cracking furnace (1) under cracking conditions that result in a ratio of propylene to ethylene, composition From 0.25 to 0.85 kg/kg at the outlet of the cracking furnace, and the ratio of propylene to ethylene for the second hydrocarbon feedstock is higher than the ratio of propylene to ethylene for the first hydrocarbon feedstock.

EFFECT: increasing the yield of propylene.

13 cl, 3 dwg