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- W2294908404 abstract "Background The extraction equilibria of ammonia was investigated with sodium salt of di-(2-ethylhexyl)phosphoric acid (D2EHPA) as extractant and kerosene, n-heptane and toluene as diluents at 298 ± 0.5 K. In addition, n-decanol was used as a modifier. Results The distribution coefficient increases gradually with increasing Na–D2EHPA concentration in the organic phase. The equilibrium model for the extraction of ammonia with D2EHPA was established by utilizing the mass action law to determine model parameters and apparent extraction equilibrium constants (K1 and K2). The combination of ion-pair species of the type NH4R(HR)4 and NH4R is confirmed to exist in the organic phase at equilibrium. The calculated loadings of D2EHPA agree well with the experimental data. The distribution coefficient of ammonia decreases with increasing initial ammonium concentration in the aqueous solution. The effect of temperature on extraction equilibria was studied and the enthalpy change, free energy change and entropy change of the extraction process with D2EHPA in kerosene were obtained. Conclusions Saponification of the extractant is necessary and benefits the extraction process. The model established in this work is valid in representing the equilibrium behavior of ammonia with D2EHPA in the three diluents. © 2016 Society of Chemical Industry" @default.
- W2294908404 created "2016-06-24" @default.
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- W2294908404 date "2016-04-06" @default.
- W2294908404 modified "2023-10-16" @default.
- W2294908404 title "Extraction of ammonia from solutions with D2EHPA in three diluents: extraction equilibria and modeling" @default.
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- W2294908404 doi "https://doi.org/10.1002/jctb.4978" @default.
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