| 摘要 |
<p>A method comprising, in the operation of a thermal cracking apparatus including a heating furnace, two or more lines each having two reaction vessels and a distillation column, repeating in each of the lines the cycle of charging a petroleum-derived heavy oil from the heating furnace into the first reaction vessel and subsequently the second reaction vessel; in each of the reaction vessels, bringing steam into direct contact with the petroleum-derived heavy oil to thereby induce thermal cracking reaction; and causing formed gaseous substances and steam to flow out and be fed into the distillation column to thereby carry out a distillation separation, wherein the above cycle is provided with a phase difference so that the times of commencement of charging into the first reaction vessel are different among the lines. As a result, there can be attained improvement of an instability of inflow rate of cracking products into the distillation column, an enhancement of cracking performance, an increase of cracking product processing rate, etc.</p> |
