Measurement of solubilities of palmitic acid in supercritical carbon dioxide and entrainer effect of water by FTIR spectroscopy

被引：25
|
作者：
Iwai, Y [1 ]
Uno, M [1 ]
Nagano, H [1 ]
Arai, Y [1 ]
机构：
[1] Kyushu Univ, Fac Engn, Dept Chem Engn, Higashi Ku, Fukuoka 8128581, Japan
来源：
JOURNAL OF SUPERCRITICAL FLUIDS | 2004年 / 28卷 / 2-3期
关键词：
supercritical carbon dioxide; palmitic acid; water; solubility; entrainer effect; FTIR spectroscopy;
D O I：
10.1016/S0896-8446(03)00013-5
中图分类号：
O64 [物理化学（理论化学）、化学物理学];
学科分类号：
070304 ; 081704 ;
摘要：
The solubilities of palmitic acid in supercritical CO2 and supercritical CO2+water were measured by using a static recirculation method combined with on-line Fourier transform infrared (FTIR) spectroscopy. Experiments were carried out at 15.0 MPa and 313.2 K. The peak of CH2 symmetric stretching band for palmitic acid was used to measure the solubilities of palmitic acid. The solubility of palmitic acid in supercritical CO2 saturated with water was found to be 16% larger than that in supercritical CO2. The interaction between palmitic acid and water was investigated, and the amount of interaction species was determined by using FTIR spectroscopy. The noticeable bands were the C=O stretching bands for palmitic acid. It was also found that the solubility of palmitic acid in supercritical CO2 increased with increasing molarity of water, because of the interaction between water and carboxyl group in palmitic acid. (C) 2003 Elsevier B.V. All rights reserved.
引用
收藏
页码：193 / 200
页数：8
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