Salting-out extraction systems of ethanol and water induced by high-solubility inorganic electrolytes

Shaoqu Xie; Wenli Song; Conghua Yi; Xueqing Qiu

Journal of Industrial and Engineering Chemistry, Vol.56, 145-150, December, 2017

DOI10.1016/j.jiec.2017.07.006 Export Citation

Salting-out extraction systems of ethanol and water induced by high-solubility inorganic electrolytes

Shaoqu Xie, Wenli Song, Conghua Yi^†, and Xueqing Qiu^†

School of Chemistry & Chemical Engineering, South China University of Technology, No. 381 Wushan Road, Guangzhou 510640, PR China

E-mail:,

The salting-out extraction systems of ethanol and water induced by the high-solubility inorganic electrolytes were investigated at 25 °C. More than 99.90% of ethanol was salted out into the organic phase. The salt content of the organic phase is only about 0.01 wt%, which is negligible for the application of the ethanol.salt salting-out extraction. More than 90% of water can be retained in the aqueous phase. It is concluded that the salting-out effects of four salting-out agents on the aqueous solution of ethanol are ordered in the sequence: K4P2O7> K3PO4> K2HPO4> K2CO3.

Keywords:Salting-out extraction;Ethanol;High-solubility inorganic electrolytes;Recovery;Solubility correlation

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[1] Li F, Li Q, Wu S, Tan Z, Food Chem., 217, 91 (2017)

[2] Malinowski JJ, Daugulis AJ, AIChE J., 40(9), 1459 (1994)

[3] Razmara RS, Daneshfar A, Sahrai R, J. Ind. Eng. Chem., 17(3), 533 (2011)

[4] Tan ZJ, Wang CY, Yi YJ, Wang HY, Li M, Zhou WL, Tan SY, Li FF, Sep. Purif. Technol., 132, 396 (2014)

[5] Seidell A, Solubilities of Inorganic and Organic Compounds, Pergamon Press, Pergamon, 1963.

[6] Hofmeister F, Archiv fur Experimentelle Pathologie und Pharmakologie 24, 247 (1888).

[7] Hofmeister F, Naunyn Schmiedeberg’s Arch. Pharmacol. 25, 1 (1888).

[8] Cho YH, Zhang YJ, Christensen T, Sagle LB, Chilkoti A, Cremer PS, J. Phys. Chem. B, 112(44), 13765 (2008)

[9] Cai Y, Cai YE, Shi Y, Liu J, Mou S, Lu Y, Microchim. Acta, 157, 73 (2007)

[10] Fu HX, Yang ST, Xiu ZL, Sep. Purif. Technol., 148, 32 (2015)

[11] Sun Y, Yan L, Fu H, Xiu Z, Eng. Life Sci., 13, 464 (2013)

[12] Hu MC, Zhai QG, Liu ZH, Xia SP, J. Chem. Eng. Data, 48(6), 1561 (2003)

[13] Guo WL, Ma JJ, Wang Y, Han J, Li YF, Song S, Thermochim. Acta, 546, 8 (2012)

[14] Yi CH, Xie SQ, Qiu XQ, J. Chem. Eng. Data, 59(5), 1507 (2014)

[15] Xie SQ, Qiu XQ, Yi CH, Fluid Phase Equilib., 386, 7 (2015)

[16] Yang QQ, Chin. Pet. Chem. Stand. Qual., 1, 39 (2007)

[17] Grundl G, Muller M, Touraud D, Kunz W, J. Mol. Liq., 236, 368 (2017)

[18] Cohn EJ, Phys. Rev., 5, 349 (1925)

[19] Schlautman MA, Yim S, Carraway ER, Lee JH, Herbert BE, Water Res., 38, 3331 (2004)

[20] Aydogan O, Bayraktar E, Mehmetoglu U, Sep. Sci. Technol., 46, 1164 (2010)

[21] Wei BC, Song ZY, Sun YQ, Xiu ZL, Chin. J. Process Eng., 12, 44 (2012)