Kinetics of V(V) extraction in V(V)-SO42− (Na+, H+)-primary amine N1923-sulfonated kerosene system using single drop technique

• Published in: Separation and purification technology 2019-05, Vol.215, p.473-479
• Main Authors: Jing, Xiaohua, Wu, Zhineng, Du, Jimin, Wang, Xiaojin, Jing, Xiaodong, Ning, Pengge
• Format: Article
• Language: English
• Subjects: Extraction kinetics; Primary amine N1923; Single drop technique; V(V) extraction
• ISSN: 1383-5866; 1873-3794
• DOI: 10.1016/j.seppur.2019.01.037

•The kinetics of V(V) extraction from H2SO4 medium by primary amine N1923 were investigated using the single falling technique.•The extraction rates of V(V) under the certain operating conditions were calculated and determined.•The parameters of extraction kinetics, such as ΔH±, ΔS± and ΔG±, were investigated and calculated.•The change characteristics of the mass transfer coefficient were analyzed according the different extracted conditions. The kinetics of V(V) extraction from acidic sulfate medium by primary amine N1923(RNH2) dissolved in sulfonated kerosene has been investigated using a falling single drop technique. The time of drop formation and coalescence was determined and considered for calculating the V(V) transfer flux. The effects of aqueous pH, V(V) concentration and RNH2 concentration on the revised V(V)-transfer flux(F′) have been investigated with aim of obtaining the reaction orders for extraction rate. Activation energies (Ea) of extracted reaction for the aqueous pH of 2.0, 3.0 and 4.0 under the conditions of V(V) concentration of 0.24 mol/L, RNH2 concentration of 0.24 mol/L, temperature of 298 ± 0.5 K and an atmospheric pressure, were −8.04, −9.57 and −12.45 kJ/mol, respectively. The ΔH± for reactions under various operating conditions were also calculated according to the intercept of log(F′h/kT) versus (1/T) plots. The details studies on the kinetics of V(V) extraction from simulated industrial aqueous solution are significant to optimize its separation technology.