FT-IR study on interactions between solutes and entrainers in supercritical carbon dioxide |
| |
| Institution: | 1. Beijing Key Laboratory of Materials Utilization of Nonmetallic Minerals and Solid Wastes, National Laboratory of Mineral Materials, School of Materials Science and Technology, China University of Geosciences, Beijing 100083, China;2. New Technologies - Research Centre, University of West Bohemia, Univerzitni 8, 306 14 Pilsen, Czech Republic;3. Council of Scientific and Industrial Research - National Physical Laboratory Dr. K S Krishnan Marg, New Delhi 110012, India;1. School of Food and Bioengineering, Zhengzhou University of Light Industry, Zhengzhou 450002, PR China;2. Division of Plant and Soil Sciences, West Virginia University, Morgantown, WV 26506, USA;1. State Key Laboratory of Fine Chemicals, Institute of Artificial Photosynthesis, DUT-KTH Joint Education and Research Center on Molecular Devices, Dalian University of Technology (DUT), Dalian 116024, Liaoning, China;2. Key Laboratory for Fuel Cell Technology of Guangdong Province, School of Chemistry and Chemical Engineering, South China University of Technology, Guangzhou 510641, Guangdong, China;3. Ningbo Institute of Dalian University of Technology, Ningbo 315000, Zhejiang, China;4. College of Chemistry and Chemical Engineering, Qingdao University, Qingdao 266071, Shandong, China;1. CAS Key Laboratory of Urban Pollutant Conversion, Collaborative Innovation Centre of Suzhou Nano Science and Technology, Department of Applied Chemistry, University of Science and Technology of China, Hefei, China;2. College of Environment and Resources, Guangxi Normal University, Guilin, China;1. Beijing National Laboratory for Molecular Sciences, CAS Key Laboratory of Organic Solids, Institute of Chemistry, Chinese Academy of Sciences, Beijing 100190, China;2. University of Chinese Academy of Sciences, Beijing 100049, China |
| |
| Abstract: | Fourier transform infrared (FT-IR) spectroscopy has been used to measure the molarities of hydrogen bonding species between carboxylic acids (acetic acid and palmitic acid) and water in supercritical CO2. The equilibrium constants of dimerization for the carboxylic acids were determined in supercritical CO2 with octane. Further, the interactions of propanol-d (1- and 2-propanol-d) or xylenol (2,5-, 2,6- and 3,4-xylenol) isomers with acetone in supercritical CO2 were studied. Experiments were carried out at 308.2–313.2 K and 7.0–20.0 MPa. The molarities of hydrogen bonding species between the carboxylic acids and water in supercritical CO2 increase with the increasing molarity of water. The carboxylic acids interact more easily with ethanol than water in supercritical CO2. For supercritical CO2+carboxylic acid+octane systems, the equilibrium constants between the carboxylic acid monomer and dimer increase with the increasing molarity of octane. The equilibrium constants of the carboxylic acids seem to approach to those in liquid paraffin according to addition of octane in supercritical CO2. The amount of the interaction species between 1-propanol-d and acetone is larger than that between 2-propanol-d and acetone. The amount of acetone interacting with OH group for 3,4-xylenol is the largest among those for xylenol isomers. These differences among the isomers may be caused by the screen effects of methyl groups around hydroxyl group for the isomers. |
| |
| Keywords: | |
| 本文献已被 ScienceDirect 等数据库收录！ |
|
