The solubility of anthracene, pyrene, chrysene, perylene, and carbazole were determined at temperatures ranging from 298 K to 498 K and pressures from 30 bar to 60 bar in subcritical (superheated) water. Increasing temperature up to 498 K increased solubilities by 5 orders of magnitude. For example, increasing the temperature from 298 K to 498 K increased the mole fraction solubility of chrysene from (0.63 ( 0.08) × 10 -9 to (75 800 ( 4000) × 10 -9 . While large increases in pressure result in lower solubilities, over the narrow range of pressures studied, pressure had a minimal effect. Solubilities as a function of temperature were estimated on the basis of simplifying assumptions and empirical correlations based on data presented in this and previously reported work. The method only requires knowledge of ambient temperature solubility. Estimated values generally agree with experimental results within a factor of 4, even over 5 orders of magnitude in solubility changes.

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The solubility of ethylbenzene, m-xylene, and benzene in water was determined using a laboratory-made system at temperatures ranging from 298 K to 473 K and a pressure of 50 bars. The solubility was enhanced by at least 1 order of magnitude by increasing the temperature from ambient to 473 K. A simple approximation model was developed to predict the solubility of liquid organics in high-temperature water. This model delivers an excellent estimation of the solubility of small molecules of liquid organic compounds in water at temperatures at or higher than 373 K.