Solubility of sodium chloride in water under high pressure

The solubility (msat) of sodium chloride in water was measured in the pressure range 0.10–300 MPa, and temperatures from 263 to 313 K. In the region of high temperature and low pressure, the solubility values of NaCl anhydride obtained were fitted to the equation ln[msat(p, T)/mol kg−1] = 2.86623 − 571.361/(T/K) + 77,128/(T/K)2 + 4.0479 × 10−4(p/MPa) − 7.445 × 10−7(p/MPa)2 + 6.209 × 10−10(p/MPa)3 with a standard deviation of 0.08%. In the low-temperature and high-pressure region, the values for NaCl·2H2O were fitted to ln[msat(p, T)/mol kg−1] = 5.35183 − 1366.040/(T/K) + 108,664/(T/K)2 + [0.010331 − 5.8869(T/K)−1 + 831.7(T/K)−2](p/MPa) with a standard deviation of 0.14%. The experimental values of the high-pressure solubilities were compared with thermodynamic estimates using density data of the solid and aqueous solution of sodium chloride and the activity coefficient of the aqueous solution.