Activity Coefficient of β-Diketone in Ammoniacal Solutions at 298.15 K

Abstract

The solubility of 4-ethyl-1-phenyl-1,3-octadione in pure water, (NH 4 ) 2 SO 4 , NH 3 (aq), and (NH 4 ) 2 SO 4 −NH 3 −H 2 O solutions was measured by means of isothermal solution method at 298.15 K. The investigated total ammonia concentration ranges of NH 3 , (NH 4 ) 2 SO 4 , and (NH 4 ) 2 SO 4 −NH 3 −H 2 O system were up to 1.8053 mol•L −1 , 3.0135 mol•kg −1 , and 6.4 mol•kg −1 , respectively. The experimental results indicate that the solubility of 4-ethyl-1-phenyl-1,3-octadione in NH 3 and (NH 4 ) 2 SO 4 −NH 3 −H 2 O solutions increases with the increase of total ammonia concentration. In contrast, its solubility in (NH 4 ) 2 SO 4 solution decreases with the increase of the ammonium sulfate concentration. The Pitzer model was adopted to correlate the dependency of the solubility with the activity coefficients. The parameters obtained by the least-squares method can explain the salting effect phenomenon and can be used to calculate and predict the activity coefficients of 4ethyl-1-phenyl-1,3-octadione in ammoniacal solutions by the Pitzer model.

A novel strategy achieving enrichment of metal values from and into ammoniacal solutions

“…Although TOC content slightly increases with increase of pH, it is only about 1.39-1.66 mg/L in the pH range from 8.5 to 10, indicating there is no significant loss of organic phase. This result is consistent with our previous solubility measurement of 4-ethyl-1-phenyl-1,3-octadione in the ammoniacal solutions [22].…”

Waste sawdust-based composite as an interfacial evaporator for efficient solar steam generation

“…Thus, it is time to seek a sustainable desalination technology that is low cost, scalable, portable and achieves peak output with low energy input. [6][7][8][9] Solar energy is one of the indispensable, sustainable and renewable energy technologies. Currently, solar energy is employed in the photochemical, photovoltaic and photothermal elds.…”

Thermodynamic Properties of the β-Diketone–ZnSO4–(NH4)2SO4–NH3(aq)–H2O System

“…The results indicate that sterically hindered β-diketones are appropriate for extracting zinc from ammoniacal solutions because of their high stability, good extraction, and strip performance. Then, Qinxiang Li et al investigated the solubility and activity coefficient of β-diketone in ammoniacal solutions. However, the thermodynamic properties of β-diketone in the extraction process are still poorly characterized.…”

“…The results indicate that sterically hindered β-diketones are appropriate for extracting zinc from ammoniacal solutions because of their high stability, good extraction, and strip performance. Then, Qinxiang Li et al 25 by connecting the extraction thermodynamic equilibrium constant express with Gibbs−Duhem formula.…”