The research activities of Chemopetrol/VÚAnCh in the area of steam cracking by-products utilization are described. The main attention is paid to the treatment of pyrolysis gasoline and pyrolysis oil to obtain a feed for aromatic hydrocarbon resins. The two-column system for the production of tailor-made cuts for syntheses of different resins is described. The process for a separation of dicyclopentadiene of various purities is mentioned, as well.