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Kinetics and mechanism of Yttrium extraction with three acidic phosphorus extractants
Author(s) -
Ma Enxin,
Jiang Peihua,
Jin Pinli
Publication year - 1991
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/jctb.280510304
Subject(s) - yttrium , chemistry , phosphoric acid , extraction (chemistry) , kinetics , inorganic chemistry , octane , rate equation , phosphorus , reaction rate , nuclear chemistry , chromatography , organic chemistry , catalysis , physics , quantum mechanics , oxide
A mechanic study is reported, which deal with the kinetic aspects of yttrium extraction from HAc‐NaAc‐EDTA media, using three acidic phosphorus extractants (HL), di(2‐ethylhexyl)phosphoric acid (HDEHP), 2‐ethylhexylphosphonic acid mono‐2‐ethylhexyl ester (HEH[EHP]) and di(2,2,4‐trimethylpentyl)phosphinic acid(H[DTMPP]) in n‐octane solution. The initial rates of extraction for these three systems were determined under conditions of energetic stirring or mixing of the two phases. The rate data were correlated as a function of the concentration of the relevant species. From the rate equationsand the interfacial characteristics, the heterogeneous chemical reactionwas established as the rate‐determining step of the overall reaction for the three extractants studied. A mechanism has been proposed for this reaction. The order of the extraction rate was found to be HDEHP>HEH[EHP] > H[DTMPP], and is related to the number of CP bonds in the extractants.