Open AccessMass transfer process study of Fe(III) extraction from ammonium dihydrogen phosphate solution
Author(s) -
Weiqi Li,
Hui Liu,
Jun Li,
Jianhong Luo,
Lei Sun
Publication year - 2020
Publication title -
journal of the serbian chemical society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.227
H-Index - 45
eISSN - 1820-7421
pISSN - 0352-5139
DOI - 10.2298/jsc191017032l
Subject(s) - phosphoric acid , chemistry , ammonium dihydrogen phosphate , extraction (chemistry) , phosphate , inorganic chemistry , mass transfer , tri n butyl phosphate , crystallization , diffusion , ammonium , reaction rate , raw material , catalysis , chromatography , solvent extraction , thermodynamics , organic chemistry , physics
The crystallization of ammonium dihydrogen phosphate (MAP) is largely affected by certain metal ions such as Fe (III), and the influence seems to be pointed at both ends. Therefore, the industrial-grade MAP products can only be obtained by purifying the neutralized MAP solution from wet-process phosphoric acid (WPA). The extraction kinetics of Fe (III) from MAP solution using di-2-ethylhexyl phosphoric acid (D2EHPA) in sulfonated kerosene measured by the Lewis cell. The extraction mechanism is discussed and confirmed on the basis of the dimeric model of D2EHPA in non-polar solution. From the temperature dependence of reaction rate, the value of Ea and Kf are calculated and the extraction regimes are deduced to be mixed controlled with diffusion and chemical reaction for Fe (III). Ultimately, the rate equation for the extraction reaction of Fe (III) with D2EHPA is obtained as follows: Rf = 0.028cFe3+1.2cH2A2 0.81cH+-0.85.