title: [Comparative study on separation of p-aminobenzoic and p-hydroxy-benzoic acids by reactive extraction].
abstract: The comparative study on reactive extraction of p-aminobenzoic and p-hydroxybenzoic acid with Amberlite LA-2 and D2EHPA in two solvents with different polarity (n-heptane and dichloromethane) indicated that the nature of the specific substituents, extractant type and solvent polarity control the extraction mechanism. Although the reactive extraction with Amberlite LA-2 of the two acids occurs by means of rather similar interfacial reactions, the extraction with D2EHPA is based on different mechanisms, due to the participation of the two different substituents of aminic and phenolic type. In all cases, the most efficient extractions have been reached for the combination Amberlite LA-2-dichloromethane.
authors.affiliation: Facultatea de Bioinginerie Medicală, Catedra de Tehnologie Protetich si Biotehnologii, Universitatea de Medicina si Farmacie Gr.T. Popa Iaşi.
authors.forename: Anca-Irina
authors.initials: AI
authors.lastname: Galaction
authors.forename: D
authors.initials: D
authors.lastname: Caşcaval
mesh_terms: D010129:4-Aminobenzoic Acid / Q000737:chemistry* / Q000302:isolation & purification*; D000588:Amines / Q000737:chemistry*; D002627:Chemistry, Physical; D006536:Heptanes; D006801:Humans; D062385:Hydroxybenzoates / Q000737:chemistry / Q000302:isolation & purification*; D008752:Methylene Chloride / Q000737:chemistry*; D010755:Organophosphates / Q000737:chemistry; D012997:Solvents; D014803:Vitamin B Complex / Q000737:chemistry* / Q000302:isolation & purification*
chemical_list: D000588:Amines; D006536:Heptanes; D062385:Hydroxybenzoates; D010755:Organophosphates; D012997:Solvents; C016214:Amberlite LA-2; D014803:Vitamin B Complex; C007377:di-2-(ethylhexyl)phosphoric acid; C028618:n-heptane; D008752:Methylene Chloride; D010129:4-Aminobenzoic Acid