Method for producing olefins and monocyclic aromatic hydrocarbons by a combination of steam cracking, dicyclopentadiene reduction, and cracking and reforming

A method for producing an olefin and a monocyclic aromatic hydrocarbon, comprising:

• thermally cracking a feedstock in a steam cracker to obtain a feedstock oil comprising a dicyclopentadienes content and having a 90 volume % distillation temperature of 220-390° C.;
• treating the feedstock oil to reduce the dicyclopentadienes content in the feedstock oil to obtain a treated feedstock oil comprising a dicyclopentadienes content of 10% by weight or less;
• and
• reacting the treated feedstock oil by contact with a cracking and reforming catalyst containing crystalline aluminosilicate to obtain a product comprising an olefin having 2 to 4 carbon atoms and a monocyclic aromatic hydrocarbon having 6 to 8 carbon atoms;
• wherein
• treating the feedstock oil comprises heating the feedstock oil to convert dicyclopentadiene to two cyclopentadiene monomers, or selectively hydrogenating an olefin portion included in the dicyclopentadiene, and
• the thermally cracking is carried out at a temperature of 770-850° C.