Measurement of solubilities of palmitic acid in supercritical carbon dioxide and entrainer effect of water by FTIR spectroscopy
| Autor: | Yasuhiko Arai, Yoshio Iwai, Machiko Uno, Hirotaka Nagano |
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| Rok vydání: | 2004 |
| Předmět: |
Supercritical carbon dioxide
Molar concentration Infrared Chemistry General Chemical Engineering Condensed Matter Physics Supercritical fluid Palmitic acid chemistry.chemical_compound Organic chemistry Physical and Theoretical Chemistry Fourier transform infrared spectroscopy Solubility Spectroscopy Nuclear chemistry |
| Zdroj: | The Journal of Supercritical Fluids. 28:193-200 |
| ISSN: | 0896-8446 |
| DOI: | 10.1016/s0896-8446(03)00013-5 |
| Popis: | The solubilities of palmitic acid in supercritical CO 2 and supercritical CO 2 +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 CH 2 symmetric stretching band for palmitic acid was used to measure the solubilities of palmitic acid. The solubility of palmitic acid in supercritical CO 2 saturated with water was found to be 16% larger than that in supercritical CO 2 . 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 CO stretching bands for palmitic acid. It was also found that the solubility of palmitic acid in supercritical CO 2 increased with increasing molarity of water, because of the interaction between water and carboxyl group in palmitic acid. |
| Databáze: | OpenAIRE |
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