Reactive extraction of d, l-α-phenylglycine with a quaternary ammonium salt: Effect of hydroxide anions and water coextraction

• Published in: Separation and purification technology Vol. 51; no. 1; pp. 18 - 23
• Main Authors: González-Muñoz, María Jesús, Luque, Susana, Álvarez, José R., Coca, José
• Format: Journal Article
• Language: English
• Published: Amsterdam Elsevier B.V 01.08.2006; Elsevier Science
• Subjects: Applied sciences; Chemical engineering; Exact sciences and technology; Extraction; Modelization; TOMAC; Water coextraction; α-Phenylglycine; TOMAC; Extraction; Modelization; α-Phenylglycine; Water coextraction; Equilibrium constant; Salt effect; Mathematical model; Modeling; Material balance
• ISSN: 1383-5866; 1873-3794
• DOI: 10.1016/j.seppur.2005.12.018

The extraction equilibria of α-phenylglycine in alkaline solutions with tri- n-octylmethylammonium chloride (TOMAC) (10%, v/v) in 1-decanol as diluent have been studied. Hydroxide anion and water co-extraction were also investigated. Equilibrium constants for the extraction of phenylglycine and OH - ions have been determined experimentally at 20 °C, being K ePhg = 1.09 and K eOH = 0.30. A mathematical model has been developed to predict the equilibrium concentrations from initial conditions, the equilibrium constants and mass balances to the system. The model takes into account the coextraction of water (3.5 ± 0.4%, v/v) that was determined to be independent of feed concentration.