▎ 摘　　要

NOVELTY - Composition comprises pores with an average diameter of 2 nm and a carbon structure having a single layer of graphene with pore. USE - The method is useful for separating ethane and ethylene (claimed). ADVANTAGE - The composition selectively adsorbs ethane even at high pressures where normal separation reactions are performed and can be applied to the adsorption separation process of ethylene mixed gas. DETAILED DESCRIPTION - INDEPENDENT claims are also included for : (1) adsorption separation method of ethane/ethylene mixed gas, comprising contacting a mixed gas containing ethane and ethylene to a reactor including pores having an average diameter of less than or equal to 2 nm and having a carbon structure having a single-layer graphene pore wall; and (2) producing ethylene gas having purity of greater than or equal to 99 mol.%, comprising (a) collecting ethylene gas having an ethane content of less than or equal to 1 mol.% from a gas outlet while adsorbing ethane by injecting a mixed gas containing ethylene, where the adsorbent layer includes pores an average diameter of less than or equal to 2 nm, has carbon structure with a single-layer graphene pore wall, and a gas inlet on one side and the other side is provided with a gas outlet, and the gas injected from the gas inlet passes through the adsorbent layer and is discharged through the gas outlet, (b) saturating the adsorbent layer by adsorbing ethylene while desorbing the adsorbed ethane by injecting ethylene gas at a pressure less than the adsorption pressure into the reactor adsorbing greater than or equal to 1 ml.% ethane in the gas discharged from the gas outlet, (c) injecting mixed gas containing ethane and ethylene having a pressure of 20 bar to the reactor in which the adsorbent layer is saturated with ethylene to absorb ethane and collect ethylene gas having ethane.