STEAM CRACKING PROCESS Russian patent published in 2018 - IPC C10G9/36 C10G47/22 C10G75/00 

FIELD: oil and gas industry.

SUBSTANCE: steam cracking process is described comprising heating liquid feedstock in a convection section of a cracking furnace and subsequent supply of said material to the radiation section of the cracking furnace for carrying out the cracking reaction therein, at that to perform the cracking reaction a monoolefin-containing stream is fed to the cracking furnace in accordance with at least one of the following modes: mode A (mixing the first mixture with liquid feedstock, heating the produced mixture in the convection section and then feeding thereof to the radiation section for conducting the cracking reaction), mode B (feeding the monoolefin-containing stream or the first mixture to the inlet of the radiation section and mixing thereof with the material from the convection section) and mode C (feeding the monoolefin-containing stream or the first mixture to the outlet of the radiation section and mixing thereof with the first cracking reaction products to conduct the second cracking reaction). Wherein the monoolefin-containing stream is a hydrocarbon stream containing at least one compound selected from the group consisting of ethylene, propylene, butene, pentene and hexene, with total content of ethylene, propylene, butene, pentene, and hexene greater than 10% by weight relative to the hydrocarbon stream. The first mixture is a mixture comprising a monoolefin-containing stream and at least one component selected from steam and hydrogen.

EFFECT: steam cracking process of the present invention makes it possible to reduce coke formation in the convection section of the cracking furnace using olefins in the feedstock composition, so that the cracking furnace can be stably operated for a long period of time.

15 cl, 4 dwg, 28 tbl, 11 ex