Design and optimization of a semi-continuous high pressure carbon dioxide extraction system for acetic acid |
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| Affiliation: | 1. Institute of Process Engineering (IPE), ETH Zurich, Sonneggstrasse 3, 8092 Zurich, Switzerland;2. RMS Foundation, Bischmattstrasse 12, 2544 Bettlach, Switzerland;1. Polymers & Composites, Council for Scientific & Industrial Research (CSIR), PO Box 395, Pretoria, South Africa;2. Department of Industrial Engineering, University of Salerno, Via Giovanni Paolo II, 132, 84084 Salerno, Italy;3. Research Centre for Nanomaterials and Nanotechnology (NANOMATES), Salerno University, Salerno, Italy;1. School of Mechanical & Power Engineering, Shanghai Jiaotong University, Shanghai 200240, China;2. Instrumental Analysis Center, Shanghai Jiaotong University, Shanghai 200240, China |
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| Abstract: | Supercritical fluid extraction with carbon dioxide was performed to extract acetic acid from real and model solutions of cow rumen fluid. Extractions were performed at varying temperature, pressure, solvent flow rate and extraction times for determining the extraction efficiency using a response surface statistical design. Within the range of variables studied, maximum acetic acid recovery of 93% was predicted at 2.0 g CO2/min solvent flow rate, 2150 psi (14.8 MPa), 45 °C, and a 5 h extraction time using an initial acetic acid concentration of 92.4 g/L. A volumetric mass transfer coefficient of 2.848 h?1 at 35 °C and 1500 psi (10.3 MPa) was calculated using a two-film linear driving force mass transfer model. The developed statistical model was tested for applicability on an acetic acid-spiked cow rumen fluid giving comparable results to the developed model. Results further showed that higher molecular weight volatile fatty acids such as propionic and butyric acid present in the fluid were preferentially removed before acetic acid extraction. |
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| Keywords: | Acetic acid Supercritical carbon dioxide Fermentation Organic acids Rumen |
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