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Modeling of the Temperature Effect on Oxygen Absorption by Iron‐Based Oxygen Scavengers
Author(s) -
Polyakov Vladimir A.,
Miltz Joseph
Publication year - 2016
Publication title -
journal of food science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.772
H-Index - 150
eISSN - 1750-3841
pISSN - 0022-1147
DOI - 10.1111/1750-3841.13148
Subject(s) - oxygen , kinetics , absorption (acoustics) , chemistry , arrhenius equation , thermodynamics , limiting oxygen concentration , analytical chemistry (journal) , materials science , chromatography , activation energy , organic chemistry , physics , quantum mechanics , composite material
A new engineering‐oriented model for prediction of the effect of temperature on the kinetics of oxygen absorption by iron‐based oxygen scavengers (IOSs) was developed. The model is based on the physicochemical mechanism of the O 2 scavenging process by the active component of the IOS (iron powder). The conclusions of this study are: (1) the iron deposits formed on the iron particles are composed of 2 different layers: an inner layer of Fe 3 O 4 and an outer layer of FeOOH that vanishes with the depletion of oxygen. (2) The model considers the chemical processes in the heterogeneous closed system “Fe–H 2 O–NaCl–O 2 ” and describes the kinetics of oxygen absorption by the powder, depending on the characteristics of the system. (3) The nonlinear ordinary differential equation (ODE) of the O 2 absorption kinetics was derived and a simple approximate solution to this ODE was obtained theoretically that is similar to the empirical exponential formula published in the relevant literature. (4) The temperature dependence of the oxygen absorption rate is more complicated than that described by the Arrhenius equation.