Abstract Rosemary essential oil is composed of key components used in pharmaceutical and cosmetics products worldwide. Among several components found in rosemary essential oil, it can be simplified by a mixture of α-pinene, eucalyptol, and camphor. Aiming an enhanced product quality, the separation of eucalyptol and camphor from α-pinene was evaluated employing ethanol + water mixtures as solvents. For that, liquid-liquid equilibrium data of systems composed of α-pinene + eucalyptol + camphor + ethanol + water at T = (298.2 ± 0.1) K were thus assessed. Thermophysical properties of the phases from the equilibrium as density, viscosity, surface tension, and interfacial tension were also evaluated. Increased water amount in the solvent caused decreased distribution coefficients, but higher solvent selectivity and thermophysical properties. Increased oxygenated compounds in the terpene phase also led to enhanced density and viscosity values, but lower solvent selectivity and interfacial tension. Binary interaction parameters of the NRTL adjusted to the experimental data and empirical equations described satisfactorily the phases compositions and thermophysical properties, with relative deviations of 0.73% for NRTL, 0.006% for density, 0.22% for viscosity, 5.78% for surface tension, and 5.88% for interfacial tension.

中文翻译：

---

迷迭香模型精油（α-蒎烯+桉油精+樟脑）和溶剂（乙醇+水）在室温下的液-液平衡

摘要 迷迭香精油是全球制药和化妆品中使用的关键成分。在迷迭香精油中发现的几种成分中，它可以简化为α-蒎烯、桉叶油和樟脑的混合物。为了提高产品质量，使用乙醇 + 水混合物作为溶剂，评估了桉油精和樟脑与 α-蒎烯的分离。为此，因此评估了由 α-蒎烯 + 桉树脑 + 樟脑 + 乙醇 + 水组成的系统在 T = (298.2 ± 0.1) K 时的液-液平衡数据。还评估了平衡相的热物理性质，如密度、粘度、表面张力和界面张力。溶剂中水量的增加导致分配系数降低，但溶剂选择性和热物理性能提高。萜烯相中含氧化合物的增加也导致密度和粘度值增加，但溶剂选择性和界面张力降低。NRTL 的二元相互作用参数调整到实验数据和经验方程，令人满意地描述了相组成和热物理性质，NRTL 的相对偏差为 0.73%，密度为 0.006%，粘度为 0.22%，表面张力为 5.78%，和 5.88 % 为界面张力。