Seven experimental determinations have been published on the solubility of 1,3-dichlorobenzen & in water in various temperature intervals (1-7), see Figure 1. Some rather serious discrepancies between the various solubility measurements are evident in the figure. The discrepancy between the two determinations (3) and (6) is about 47 percent at ambient temperature. The solubility data of Klemenc and Low (1) cover the temperature range between 293 and 333 K, while the measurements of Vesala (2,3) fall in the temperature range between 283 and 308 K. The remaining measurements reported (4-7) fall in the room temperature range.
The solubility measurements of Vesala (2,3) have been taken as most reliable and, therefore, these values were heavily weighed in the correlation of solubility versus Absolute temperature by means of a normal, three degree polynomial equation:
S1(g(l)/kg) = 27.6827 - 2.61597 x 10-1 T +
8.19706 x 10-4 T2 – 8.4698 x 10-7T3 [1]
The significance of this equation representing the solubility data is that the curve passes through a minimum at 298.2 K. This observation is consistent with the theory discussed by Gill et al. (8) for the solubility of aromatic compounds in water.
The errors in the recommended solubility values given below could be as large as ± 10 percent, particularly at the higher temperatures. Recommended solubility values calculated from equation [1] together with corresponding molarity and mole fraction values are listed in Table 1. Also, the solubility values calculated from equation [1] are shown in Figure 1 as a solid line along with the measured values.
The recommended molar concentrations and mole fractions have been calculated from the g(1)/kg and the densities of the two components at the equilibrium temperatures indicated.