Abstract: The source of styrene tar, the properties of polymerization inhibitor 2-sec-butyl-4,6- dinitrophenol (DNBP) and the composition of styrene tar were introduced. The feasibility of recycling styrene tar into qualified oil products was theoretically analyzed. The design and implementation of the scheme for converting styrene tar into qualified oil products in SINOPEC Anqing company were described in detail. The results show that when the styrene tar is sent to the delayed coking unit, the product value can increase while meeting the environmental protection requirements, and the total economic benefit can reach 8.3 million Yuan/a.

Key words: styrene tar, polymerization inhibitor, hazardous waste, resource utilization