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liquid–liquid extraction of lactic acid with Alamine 336
Author(s) -
SanMartín Marta,
Pazos Carmen,
Coca José
Publication year - 1996
Publication title -
journal of chemical technology and biotechnology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.64
H-Index - 117
eISSN - 1097-4660
pISSN - 0268-2575
DOI - 10.1002/(sici)1097-4660(199603)65:3<281::aid-jctb414>3.0.co;2-9
Subject(s) - amine gas treating , extraction (chemistry) , toluene , lactic acid , stoichiometry , chemistry , aqueous solution , aqueous two phase system , molecule , inorganic chemistry , nuclear chemistry , organic chemistry , bacteria , genetics , biology
The extraction of lactic acid (HL) from aqueous solutions by Alamine 336 (B) dissolved in toluene was studied. Experiments were performed in the temperature range of 25–60°C and for two amine concentrations of 20 and 40% (v/v) in toluene. The extent to which the organic phase (amine + toluene) may be loaded with lactic acid is expressed as a loading ratio, Z = C HL / C B . Z values are independent of the amine concentration and, hence, the extracted complex contains only one molecule of amine. Z decreases with increasing temperature. Experimental results indicate that the system presents overloading, i.e. Z > 1. The extraction equilibrium may be interpreted as a result of consecutive formation of three acid–amine species with stoichiometries of 1:1, 2:1 and 3:1.