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Abstract：
Rosemary (Rosmarinus officinales L. (Labiatae)) is one of the major economic crops in the world, and rosemary essential oil (REO) is one of the top products derived from rosemary and has excellent commercial prospects. Many factors affect the yield of REO extracted by hydrodistillation (HY). This study was proposed to identify and analyze these factors to maximize the yield of essential oils and reduce the cost. First, two different single-factor extraction experiments were conducted, (1) adding NaCl and (2) using various organs of the plant, to determine the influence of each factor on the oil yield. Based on single-factor experiments, the orthogonal experiments (L9, 33) were designed to determine the optimal conditions for the extraction of rosemary oil. Meanwhile, the kinetic extraction analysis of the test data was carried out. The results revealed that the highest oil yield was achieved when rosemary leaves were crushed to 2 cm, the ratio of water to the material was 1:3, and NaCl concentration was 5%. A simple first-order kinetic model has also proved to be an acceptable general choice and allows to predict the output of extraction operations overtime accurately and robustly in practice. This study provides a reference scheme for using hydrodistillation to extract rosemary essential oil.
摘要：
迷迭香(RossmarinusofficinalesL.(Labiatae))是世界上主要的经济作物之一,迷迭香精油（REO）是迷迭香的顶级产品之一，具有良好的商业前景。许多因素影响通过加氢蒸馏(HY)提取的REO的收率。本研究旨在识别和分析这些因素，以最大程度地提高精油的产量并降低成本。首先,进行了两种不同的单因素提取实验,（1）添加NaCl和（2）使用植物的各种器官，确定各因素对出油率的影响。在单因素实验的基础上,采用正交试验(L9,33)确定了迷迭香油的最佳提取条件。同时,对试验数据进行了动力学提取分析。结果表明，当迷迭香叶被压碎到2厘米时，油产量最高。水与材料的比例为1:3,NaCl浓度为5%。简单的一阶动力学模型也被证明是可以接受的一般选择，并且可以在实践中准确而稳健地预测随时间的提取操作的输出。本研究为加氢蒸馏法提取迷迭香精油提供了参考方案。
