Salt effect parameter from tie line correlation constants

• Published in: The Chemical engineering journal and the biochemical engineering journal Vol. 60; no. 1; pp. 97 - 100
• Main Authors: Govindarajan, M., Sabarathinam, Pl
• Format: Journal Article
• Language: English
• Published: Lausanne Elsevier B.V 01.12.1995; Elsevier Sequoia
• Subjects: Chemistry; Exact sciences and technology; General and physical chemistry; Liquid-liquid equilibria; Phase equilibria; Salt effect; Setschenow equation; Tie line correlation constants; Salt effect; Tie line correlation constants; Setschenow equation; Correlation; Ternary system; Tie line; Theoretical study; Phase equilibrium; Liquid liquid equilibrium; Concentration distribution
• ISSN: 0923-0467; 1873-3220
• DOI: 10.1016/0923-0467(95)02993-1

The tie line correlation given by Eisen and Joffe for correlating the equilibrium data of salt-containing ternary liquid-liquid equilibrium systems, i.e. ln( X CB X BB ) = a + bX s + ( c + dX s) ln( X CA X AA ) is related to the Setschenow equation, i.e. ln( X CA 0 X CA ) = k s X SA It is shown that the Setschenow constant or the salt effect parameter k s can be obtained from the tie line correlation constants a, b, c and d and the salt concentration X s: ▪ with A = b − ad c + ( d c ) ln( XCB X BB ) Such calculated k s values for various salts vary from 0.36 to 7.42 and are in accordance with those reported in the literature. The results show that, although the salt effect parameter decreases, the salt effect increases with increase in salt concentration.