The hydrate separation tower is the most important unit operation equipment in the process of separating pyrolysis gas with the aid of hydrate technique for recovering ethylene.The water-in-oil emulsion could enhance the hydrate formation rate and improve the flow behavior of hydrate slurry.In this work，the simulation algorithm of absorption-hydration separation tower for the water-in-oil emulsion system was developed，which was involved with the vapor-liquid-liquid-hydrate four phase equilibria.The operation conditions，separation efficiency and energy consumption of the hydrate separation tower were studied under the different gas-liquid ratio conditions by combining the equilibrium and non-equilibrium stage approach.The calculation results indicated that the lower gas-liquid ratio could improve the separation efficiency，but may bring about the high energy consumption.The results also showed that hydrogen and methane could be separated effectively from C2 plus-components at around 0℃ through hydrate technique.The calculation results are of significance for the design of hydrate separation equipment，the determination of operation conditions and the planning of separation process for the ethylene pyrolysis gas.