REACTIVE EXTRACTION OF DICARBOXYLIC-ACIDS SELECTIVE EXTRACTION

In this paper the studies on separation of some dicarboxylic acids (ox alic acid, malonic acid, succinic acid and adipic acid) by reactive ex traction with Amberlite LA-2 in butyl acetate were continued. Thus, th e conditions for a selective extraction were settled. The individual s elective extraction is not possible because of the comparable values o f acidic constants for oxalic and malonic acids, on the one hand, and for succinic and adipic acids, on the other hand. In this case, only s elective extraction of oxalic and malonic acids can be achieved. For a high selectivity, both a molar ratio of 0.9-1 between the strong dica rboxylic acids (oxalic and malonic acids) and the extractant and a con centration of Amberlite LA-1 lower than the stoichiometric value for a ll acids extraction are required.