In this paper, 1-butoxy butane was proposed as a novel absorbent for carbon dioxide capturing from the process gas stream with rich carbon dioxide, and file feasibility for further research and development was investigated through the Study oil the vapor-liquid equilibrium (VLE) for the carbon dioxide + 1-butoxy butane system. The VLE measurements were earned out with a set of high pressure devices connected online to a gas chromatograph Under a range from (263.15 to 309.15) K and (0.5 to 3.0) MPa. The experimental results were given with expanded uncertainties, which were 6 0.03 K and delta 0.006 MPa. Then, oil the basis of the Peng-Robinson (PR) equation of state (EoS), an isothermal correlation for experimental data and the interaction parameter k(ij) was obtained. The average liquid absolute deviation is 0.0159, and the average vapor absolute deviation is 0.0025. It proves the validity to use the PR EoS for describing file VLE behavior for 1-butoxy butane + carbon dioxide system.