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4915696 
Journal Article 
Study of Benzoic Acid Solubility in Imidazolium Formate as Pure Ionic Liquid and Its Binary Aqueous Mixtures 
Stefan, CS; Chiriac, ER; Dragostin, O; Lisa, EL; Cioroi, M 
2017 
1 
Revista de Chimie
ISSN: 0034-7752
EISSN: 2668-8212 
68 
10 
2256-2260 
English 
WOS:000416750000011 
The determination of benzoic acid (BAc) solubility in pure imidazolium formate (ImForm) and their aqueous mixtures of [ImForm/water], was performed by the acid-base titration of the saturated solutions. [ImForm/water] solutions were tested using an ImForm concentration ranging from 1.66-4.33 g/L. The BAc solubility in pure ionic liquid was compared with that of some common organic solvents reported in literature, such as: ethanol, chloroform, cyclohexane. The highest solubility of BAc was for pure ImForm (from 1073 g/L at 293 K up to 2200 g/L at 323 K), the determined values being superior to BAc solubility in organic solvents mentioned. The results confirm that the polar solvents, such as ImForm and ethanol, present the highest BAc solubility values. At 293 K, the mole fraction of BAc in pure ImForm was 2.8 times higher than the mole fraction of BAc in ethanol. The BAc solubility in binary mixtures [ImForm/water] was compared with that determined in [NaCl/water] mixtures. At the same salt concentration, ranging from 1.66 to 4.33 g/L, at a constant working temperature (323 K), the increasing concentration of NaCl lowers the solubility of BAc. In opposite, the increasing of ImForm concentration determines a considerable increase in BAc solubility into the [ImForm/water] mixture. At 277 K, for 1.66 g/L salt concentration in water, the BAc solubility in [salt/water] solvents shows very similar values (similar to 1.3 g/L) for both [ImForm/water] and [NaCl/water]. If the temperature increases to 323 K, the BAc solubility in [ImForm/water] mixture is about 1.5 times higher than that of solubility in distillated water and 2.5 times higher compared to that in [NaCl/water]. It was concluded that the benzoic acid presents a great solubility in pure ImForm and in its [ImForm/water] aqueous mixture. 
Protic ionic liquid; Imidazolium formate; NaCl aqueous solutions; Benzoic acid; Solubility of benzoic acid