Salt effects on the partition coefficients of phenol in two-phase mixtures of water and carbon dioxide at pressures from (8 to 30) MPa at a temperature of 313 K |
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| Institution: | 1. Faculty of Pharmaceutical Sciences, Tokyo University of Science, 2641 Yamazaki, Noda, Chiba 278-8510, Japan;2. Research Institute for Science and Technology, Tokyo University of Science, 2641 Yamazaki, Noda, Chiba, 278-8510 Japan;1. Bioresource Technology Lab, Department of Biotechnology, Thiruvalluvar University, Vellore, TN 632115, India;2. Department of Microbiology, DKM College for Women, Vellore, TN 632001, India;1. Department of Chemistry and Biochemistry, University of North Carolina Wilmington, Wilmington, NC 28403,USA;2. Department of Chemistry, Texas A&M University, College Station, TX 77843, USA;1. Faculty of Pharmaceutical Sciences, Tokyo University of Science, 2641 Yamazaki, Noda, Chiba, 278-8510, Japan;2. Research Institute for Science and Technology, Tokyo University of Science, 2641 Yamazaki, Noda, Chiba, 278-8510, Japan;1. Sección de Ingeniería Química, Facultad de Ciencias, C/ Francisco Tomás y Valiente 7, Universidad Autónoma de Madrid, 28049 Madrid, Spain;2. Instituto de Catálisis y Petroleoquímica, ICP-CSIC, C/ Marie Curie 2, 28049 Madrid, Spain |
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| Abstract: | Partition coefficients Kc of phenol between an aqueous solution containing different salts and a compressed CO2 phase have been determined at T=313 K. For NaCl and (CH3)4NBr a pressure range from 8 MPa to around 30 MPa was investigated, for KCl and NaBr measurements were performed at a pressure of 22 MPa. The salt concentration has been varied between (0.25 and 3.0) mol·dm−3. With increasing pressure a rise in Kc is observed which typically is also found in systems free of salt. Salting-out was observed for the alkali salts, salting-in has been found for the ammonium salt, both effects increased with increasing salt concentration. From the concentration dependence of the Kc values Setschenow coefficients kS have been derived. At p>10 MPa values are obtained as found in two phase mixtures of water with other organic solvents at ambient pressure. This conclusion was confirmed with both literature and own experimental data in the case of salting-out by NaCl as well as for the salting-in by (CH3)4NBr from measurements with phenol in (water + cyclohexane) at T=313 K. |
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