Phase Equilibria of Long-Chain Carboxylic Acids in Supercritical Propane
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- 作者：Cara E. Schwarz ; Michelle Zamudio ; Johannes H. Knoetze
- 刊名：Journal of Chemical & Engineering Data
- 出版年：2011
- 出版时间：April 14, 2011
- 年：2011
- 卷：56
- 期：4
- 页码：1116-1124
- 全文大小：830K
- 年卷期：v.56,no.4(April 14, 2011)
- ISSN：1520-5134
文摘
This paper presents data on the phase behavior of long-chain acids (octanoic acid, decanoic acid, dodecanoic acid, hexadecanoic acid, octadecanoic acid, and docosanoic acid) in supercritical propane. The data were measured for acid mass fractions wacid = (0.0149 to 0.652) in the temperature range T = (375 to 412) K, and the phase transition occurred at pressures in the range p = (3.7 to 11.2) MPa. The data showed no temperature inversions yet does hint toward possible three-phase regions at low temperatures for acids with 10 or more carbon atoms. The data shows a linear relationship between the phase transition pressure and the temperature at constant composition. Additionally, for acids with 10 or more carbon atoms, at constant temperature and mass fraction, a linear relationship exists between the phase transition pressure and the number of carbon atoms.