Solubility of NaBr, NaCl, and KBr in Surfactant Aqueous Solutions

The solubility of inorganic salts in surfactant aqueous solutions is very important for both scientific research and inorganic salt industry. In this work, we determine the solubility of three commercially available inorganic salts, NaBr, NaCl, and KBr, in cationic tetradecyltrimethylammonium bromide (TTABr) or anionic sodium dodecyl sulfate (SDS) surfactant solutions from 298.15 to 353.15 K. The data show that the solubility of the three salts in SDS and TTABr solution increases progressively with increasing temperature, which is similar to that in water. The solubility of NaBr, NaCl, and KBr in surfactant aqueous solutions with the concentration under the TTABr or SDS cmc is higher than that in the solutions above the TTABr or SDS cmc. The solubility of NaCl and NaBr in SDS is much lower than that in water and increases slowly along with increasing temperature. For the case of KBr and NaBr in TTABr, it becomes more complicated. Below T = 312.15 K, the solubility of KBr and NaBr is much lower than that in water, but the data becomes higher when it is above T = 340.15 K. This is similar to that in water between T = (312.15 and 340.15) K. The data and the results of inorganic salts in surfactant aqueous solutions should provide the basic data and understanding for the inorganic and surfactant industries.