New isothermal vapor–liquid equilibrium (VLE) data for the carbon dioxide + 1,4-dioxane system are reported at four temperatures (323.15, 333.15, 343.15, and 353.15) K and pressures up to 122.7 bar. The critical curve was also measured up to 158.8 bar and 420.15 K. Phase behavior measurements were performed in a high-pressure windowed cell with variable volume, using a static-analytical method with phases sampling by rapid online sample injectors (ROLSI) coupled to a gas chromatograph (GC) for analysis. The experimental results of this study are compared with the scarce available literature data. The new and all available literature data for the carbon dioxide + 1,4-dioxane binary system are modelled with the cubic Soave–Redlich–Kwong (SRK) and Peng–Robinson (PR) equations of state (EoS) with classical van der Waals mixing rules (two-parameter conventional mixing rules, 2PCMR). The modeling showed that SRK and PR models can accurately predict the phase behavior of the system studied.

二氧化碳 + 1,4-二恶烷系统的新等温汽液平衡 (VLE) 数据在四种温度（323.15、333.15、343.15 和 353.15）K 和高达 122.7 bar 的压力下报告。还测量了高达 158.8 bar 和 420.15 K 的临界曲线。 相行为测量是在具有可变体积的高压窗口池中进行的，使用静态分析方法，通过快速在线进样器 (ROLSI) 耦合到气相色谱仪 (GC) 进行分析。本研究的实验结果与稀缺的可用文献数据进行了比较。二氧化碳 + 1 的新的和所有可用的文献数据，4-二恶烷二元系统使用立方 Soave-Redlich-Kwong (SRK) 和 Peng-Robinson (PR) 状态方程 (EoS) 建模，并采用经典范德华混合规则（双参数常规混合规则，2PCMR）。建模表明，SRK 和PR 模型可以准确预测所研究系统的相行为。