Isobaric Vapor鈥揕iquid Equilibrium for the Binary System (Ethane-1,2-diol + Butan-1,2-diol) at (20, 30, and 40) kPa

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• 作者：Zhen Yang ; Shuqian Xia ; Qiaoyan Shang ; Fangyou Yan ; Peisheng Ma
• 刊名：Journal of Chemical & Engineering Data
• 出版年：2014
• 出版时间：March 13, 2014
• 年：2014
• 卷：59
• 期：3
• 页码：825-831
• 全文大小：309K
• 年卷期：v.59,no.3(March 13, 2014)
• ISSN：1520-5134

文摘

The isobaric vapor鈥搇iquid equilibrium (VLE) data were measured for the binary system (ethane-1,2-diol + butan-1,2-diol) at (20, 30, and 40) kPa using a modified dynamic recirculating still. The thermodynamic consistency of the experimental data was confirmed using the Herington and van Ness semiempirical method. The Wilson and universal quasichemical (UNIQUAC) models were used to correlate the activity coefficients with the liquid-phase composition. The average absolute deviation of the bubble-point temperature and vapor molar fraction for all of the systems obtained from the Wilson and UNIQUAC models are less than 0.18 K and 0.0011, respectively. Furthermore, the binary system (ethane-1,2-diol + butan-1,2-diol) exhibited azeotropic behavior. In addition, the data were calculated using the UNIFAC (Do) model (modified UNIFAC model) in which ethane-1,2-diol was treated as two groups (鈭扖H₂OH), and butan-1,2-diol was split to four groups (鈭扖H₂OH, 鈭扖HOH, 鈭扖H₂, and 鈭扖H₃). The new group-interaction parameter for CH₂鈥揅H₂OH was obtained and used to estimate the VLE data for the binary system (butan-2-ol + butan-1-ol) at 101.3 kPa. The results are consistent with those of the literature data.