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在国内首次建立的一套温度高达３５０℃，压力直至２０ＭＰａ的高压液液相平衡测定装置上，测定了水－仲丁醇－碳４三元体系在８ＭＰａ和４０３．１５，４２３．１５，４４３．１５Ｋ时液液相平衡数据。采用修改的Ｒ－Ｋ方程对此数据进行了理论关联。关联结果与实验数据一致。
For the first time in China, a set of high-pressure liquid-liquid equilibrium measuring apparatus with temperature up to 350 ℃ and pressure up to 20 MPa was used to measure the water-sec-butanol-carbon 4 ternary system at 8MPa and 403.15, 423.15, 443 .15K liquid-liquid equilibrium data. This data is theoretically related using a modified R-K equation. The correlation results are consistent with the experimental data.