Measurement and Correlation of Vapor−Liquid Equilibrium for the Carbon Dioxide + 1-Butoxy Butane System

Abstract

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 the feasibility for further research and development was investigated through the study on the vapor−liquid equilibrium (VLE) for the carbon dioxide + 1-butoxy butane system. The VLE measurements were carried 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 δ 0.03 K and δ 0.006 MPa. Then, on the basis of the Peng−Robinson (PR) equation of state (EoS), an isothermal correlation for experimental data and the interaction parameter kij 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 the VLE behavior for 1-butoxy butane + carbon dioxide system.