Patent ID: 9505677
Filing Date: 2016-11-29
CPC Classification: B01J,C07C,C10G

Claim Text:
1. A steam cracking process, comprising providing a liquid feed stock, a monoolefin-containing stream, and a first mixture, respectively, wherein the monoolefin-containing stream is a hydrocarbon stream comprising at least one selecting from a group consisting of ethylene, propylene, butene, pentene and hexene, the sum content of ethylene, propylene, butene, pentene and hexane accounting for more than 10% by weight of the hydrocarbon stream, and the first mixture is a mixture comprising the monoolefin-containing stream and at least one of steam and hydrogen; heating the liquid feed stock in a convection section of a cracking furnace and subsequently conveying the heated liquid feed stock to a radiant section of the cracking furnace for cracking reaction therein, wherein the monoolefin-containing stream is conveyed to the cracking furnace for cracking reaction through at least one of the following modes: Mode B: feeding the monoolefin-containing stream or the first mixture to an inlet of the radiant section thereby mixing the monoolefin-containing stream or the first mixture with an effluent from the convection section; and Mode C: feeding the monoolefin-containing stream or the first mixture to an outlet of the radiant section thereby mixing the monoolefin-containing stream or the first mixture with products of a first cracking reaction occurring in the radiant section and performing a second cracking reaction at the outlet of the radiant section.