TY - JOUR
T1 - Measurement of solubilities of palmitic acid in supercritical carbon dioxide and entrainer effect of water by FTIR spectroscopy
AU - Iwai, Yoshio
AU - Uno, MacHiko
AU - Nagano, Hirotaka
AU - Arai, Yasuhiko
N1 - Funding Information:
The authors gratefully acknowledge the financial support provided by grant-in-aid for Scientific search (C)(2), 12650758, 2000, the Ministry of Education, Science, Sports and Culture, Japan.
PY - 2004/3
Y1 - 2004/3
N2 - 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.
AB - 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.
UR - http://www.scopus.com/inward/record.url?scp=1642422800&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=1642422800&partnerID=8YFLogxK
U2 - 10.1016/S0896-8446(03)00013-5
DO - 10.1016/S0896-8446(03)00013-5
M3 - Article
AN - SCOPUS:1642422800
SN - 0896-8446
VL - 28
SP - 193
EP - 200
JO - Journal of Supercritical Fluids
JF - Journal of Supercritical Fluids
IS - 2-3
ER -