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Compressed liquid water a t elevated temperatures is being evaluated as an extractive solvent for separating mixtures of oleochemicals. In this paper, results are presented for a model of the tall oil-water system, namely, the ternary system oleic acid-&sitosterol-water. A continuous-flow apparatus was used to measure liquid-liquid equilibrium compositions for this system a t 572,579, and 586 K. Selectivities of water for oleic acid relative to ,&sitosterol were found t o be 10-15, and distribution coefficients of oleic acid ranged from 0.0063 to 0.048 for the temperatures investigated.The experimental data were correlated with the NRTL equation. Limited data are also presented for the oleic acid-dehydroabietic acid-water system.

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The use of liquid water at elevated temperatures and pressures as an extractive solvent for separating mixtures of compounds which occur in natural oils has been studied. A southern pine tall oil and a distillate from the deodorization of soybean oil were extracted with liquid water at temperatures from 298 to 312~ and pressures between 103 and 121 bar. Results indicate that water can be used to extract fatty and resin acids from crude tall oil to obtain a product with a high acid content that produces less pitch during distillation. The process can also be used to extract fatty acids from vegetable oil deodorizer distillate.