The aim of the present work is to investigate the generalization possibilities of models describing the kinetics of essential oils extraction and the relevance of the adopted assumptions for their development. A database of 132 extraction kinetics was built on the basis of works reported in the literature. This data analysis showed two types of kinetics which differ by the presence or not of an inflection point. The simulations based on known and developed models indicated that simple first-order model considering only diffusion into solid phase with several simplifying assumptions provides results that are in good agreement with the experimental data in more than 80% of the studied cases. More complex models considering the presence of parallel or simultaneous kinetics proved highly successful; nevertheless, it was observed that the contribution of the term relative to kinetics other than first-order is significant only at the first stage of the process; thereafter all models show similar predictions. The application of the model, which takes into account the resistance in both solid and vapor phases, showed that, in nearly all cases, this model converged to a first order one. This result could be an argument in favor of approaches considering only solid phase resistance. However, several such models neglect the essential oil concentration in the vapor phase; this renders them unrepresentative, especially when the extraction kinetics is affected by the steam flow rate variations. Thus the simple first-order model proves an acceptable general option and allows in practice to predict with precision and robustness the yield of the extraction operations over time.

本工作的目的是研究描述精油提取动力学的模型及其所采用假设的相关性的模型的一般化可能性。基于文献报道的工作建立了132个萃取动力学的数据库。该数据分析显示了两种动力学，其因拐点的存在与否而不同。基于已知和已开发模型的模拟表明，仅考虑扩散到固相的简单一阶模型，并具有多个简化假设，在超过80％的研究案例中，该结果与实验数据吻合良好。考虑到存在平行或同时动力学的更复杂的模型被证明是非常成功的。但是，据观察，该术语相对于一级动力学以外的动力学的贡献仅在过程的第一阶段才有意义。此后，所有模型都显示出相似的预测。该模型的应用考虑了固相和气相的电阻，结果表明，在几乎所有情况下，该模型都收敛到一阶模型。该结果可能是赞成仅考虑固相电阻的方法的论点。但是，一些这样的模型忽略了气相中的精油浓度。这使得它们没有代表性，尤其是当抽气动力学受到蒸汽流量变化的影响时。