The amount of ethylene in the refinery exhaust gas is very high with a mass fraction of 20%,however it is used to be burned as fuel gas in most refineries.Therefore,the separation and recovery of ethylene has remarkable significance for saving energy and reducing carbon dioxide emission.The aim of the paper is to propose a novel absorbent for the ethylene absorption process,and to assess the application feasibility of the new absorbent through the vapor-liquid equilibrium dada measurement and binary interaction parameter correlation,as well as ethylene separation process simulation.On the basis of the maximal Gibbs function of binary species system for absorbent selection,mesitylene was chose.The vapor-liquid equilibrium data of ethylen.emesitylene binary system were measured by a set of high-pressure phase equilibrium apparatus at temperatures of 253.15K to 333.15 K and pressures of 0.5MPa to 3.0MPa.And the binary interaction parameters of the equation of state Peng-Robinson were regressed on the experimental data [1].Then,two ethylene separation processes,i.e.adopting liquefied petroleum gas and mesitylene as absorbent respectively,were simulated using binary interaction parameters obtained from the experiment.Compared with the literature in the same separation conditions,the process of mesitylene absorbent had prominent advantages,such as higher separating performance,lower energy consumption,less wastage rate of absefoent and the like.