To make full use of refinery dry gas, ethane in refinery dry gas is cracked in a small cracking furnace, crude separation of the cracked gas is carried out, and dilute ethylene to ethylbenzene technology is used to produce ethylbenzene and then styrene. This can not only utilize the ethane and ethylene in refinery dry gas, but also promote the transformation from refining to chemical and improve the economic benefit of the enterprise. Based on a 120 kt/a ethylene plant, this article compares the energy consumption of benzene absorption process and intercooling separation process through simulation to explore a better process.