THERMAL CRACKING METHOD FOR PREPARING OLEFINS FROM HYDROCARBONS

摘要

A thermal cracking method for producing olefins from hydrocarbons which comprises the steps of mixing said hydrocarbons with a mixed gas of methane and hydrogen in a methane/hydrogen mol ratio of 0.2 or more; prior to reaction carrying out a thermal cracking reaction under conditions such that the total concentration of methane and hydrogen is at least 40 mol % or more at the outlet of a reactor, the partial pressure of said hydrogen is 3 bars or more, the temperature at the outlet of the reactor is from 800 DEG to 1200 DEG C., and the residence time in the reactor is from 5 to 300 milliseconds; and quenching the reaction product discharged through the outlet of the reactor.