Please use this identifier to cite or link to this item: http://www.repositorio.ufop.br/handle/123456789/11173
Title: Thermodynamic investigation of the aqueous two-phase systems formed by PEG 400 + water + either sodium carbonate or potassium carbonate at different temperatures : experimental and correlational approaches.
Authors: Carvalho, Roberta de Almeida
Penido, Jussara Alves
Lobo, Fabiana Aparecida
Machado, Poliana Aparecida Lopes
Lemes, Nelson Henrique Teixeira
Virtuoso, Luciano Sindra
Lemos, Leandro Rodrigues de
Rodrigues, Guilherme Dias
Mageste, Aparecida Barbosa
Issue Date: 2019
Citation: CARVALHO, R. de A. et al. Thermodynamic investigation of the aqueous two-phase systems formed by PEG 400 + water + either sodium carbonate or potassium carbonate at different temperatures : experimental and correlational approaches. Journal of Chemical & Engineering Data, v. 64, n. 2, p. 448-458, 2019. Disponível em: <https://pubs.acs.org/doi/10.1021/acs.jced.8b00546>. Acesso em: 7 mar. 2019.
Abstract: Systems composed of poly(ethylene)glycol (PEG 400) + water + either potassium carbonate or sodium carbonate were studied at 283.15, 298.15, and 313.15 K. The effects of temperature and the electrolyte on phase segregation were evaluated. The phase segregation process was endothermic and entropically driven. The efficacy of the cations in inducing phase formation with PEG 400 followed the order K2CO3 < Na2CO3. The binodal curves were successfully described using the empirical equation suggested by Merchuk and modified to include the effect of temperature. Tie-line compositions were correlated using the Othmer–Tobias, Bancroft, and Hand equations. The experimental tie-line data for PEG 400 + K2CO3 + water and PEG 400 + Na2CO3 + water were also correlated using the nonrandom two liquid model. The use of this thermodynamic model resulted in reliable data for the system while reducing the number of experiments needed. All of the correlations indicated satisfactory fits between the calculated and experimental data.
URI: http://www.repositorio.ufop.br/handle/123456789/11173
metadata.dc.identifier.uri2: https://pubs.acs.org/doi/10.1021/acs.jced.8b00546
metadata.dc.identifier.doi: http://doi.org/10.1021/acs.jced.8b00546
ISSN: 1520-5134
Appears in Collections:DEQUI - Artigos publicados em periódicos

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