Liquid–liquid equilibria and partitioning in organic–aqueous systems

Liquid–liquid equilibria at ambient temperature and pressure were measured for four ternary systems: n-hexane + THF + water, n-hexane + acetonitrile + water, n-hexane + 1,4-dioxane + water, and ethyl ether + 1,4-dioxane + water. Partitioning of 1-octene and 1-nonanal in these systems was also measured. The results were modeled with the UNIQUAC and NRTL gE models. The experiments showed an aqueous phase in the n-hexane–THF–water system that was 90% water on average, and an organic n-hexane phase in the n-hexane–acetonitrile–water system that was 96% n-hexane on average. 1,4-Dioxane distributes fairly equally to both phases in the n-hexane–1,4-dioxane–water and ethyl ether–1,4-dioxane–water systems.