METHOD OF CONVERSION OF HYDROCARBON RAW MATERIALS WITH RECEIVING THREADS OLEFIN PRODUCTS THROUGH THERMAL STEAM CRACKING Russian patent published in 2017 - IPC C10G9/36 

FIELD: chemistry.

SUBSTANCE: invention relates to a process of conversion consisting of hydrocarbon starting materials by thermal steam cracking unit to produce at least one olefin content of a product stream comprising at least ethylene and propylene, with at least partial conversion of the starting materials at least one first cracking-pechi (1) and at least one second cracking furnace (2), wherein fresh feedstock (B) are separated by at least one first and one second fraction (B1, B2) of fresh raw material, commercially different composition, and the first fraction (B1) of fresh starting material fed at least partially into the first cracking furnace (1) and a second fraction (B2) is directed at least partially into the second cracking furnace (2). Method is characterized by the fact that the second fraction (B2) of fresh raw material primarily contains hydrocarbons with a maximum number of carbon atoms 5, the first fraction (B1) of fresh raw material primarily contains hydrocarbons with carbon number at least 6, the second a cracking furnace (2) provide the conditions that lead to cracking against propylene for ethylene, from 0.7 to 1.6 kg/kg at the exit of the cracking furnaces and in the first cracking furnace (1) provide the conditions that lead to cracking against propylene for ethylene, from 0.25 to 0.85 kg/kg at the exit of the cracking furnaces. The values achieved for the ratio of propylene to ethylene in the second cracking furnace (2) are higher than the values achieved for the ratio of propylene to ethylene in the first cracking furnace (1).

EFFECT: increase in the yield of propylene.

12 cl, 3 dwg