Optimization extraction of rosemary essential oils using hydrodistillation with extraction kinetics analysis

Area of Science:

• Agricultural Science
• Chemical Engineering
• Phytochemistry

Background:

• Rosemary (Rosmarinus officinales L.) is a globally significant economic crop.
• Rosemary essential oil (REO) is a valuable product with substantial commercial potential.
• Hydrodistillation (HY) is a common method for REO extraction, but yields are influenced by various factors.

Purpose of the Study:

• To identify and analyze factors affecting REO yield through hydrodistillation.
• To determine optimal extraction conditions for maximizing REO yield and minimizing costs.
• To provide a practical reference for industrial REO production.

Main Methods:

• Single-factor experiments were conducted to assess the impact of NaCl addition and plant organ selection on oil yield.
• Orthogonal experiments (L9, 3^3) were designed based on single-factor results to find optimal extraction parameters.
• Kinetic extraction analysis was performed to model the extraction process over time.

Main Results:

• The highest REO yield was achieved using crushed rosemary leaves (2 cm particle size), a 1:3 water-to-material ratio, and 5% NaCl concentration.
• A simple first-order kinetic model accurately predicted extraction yields over time.
• Optimal conditions were established for efficient REO extraction via hydrodistillation.

Conclusions:

• The study successfully identified key parameters for maximizing rosemary essential oil yield through hydrodistillation.
• The findings offer a practical and cost-effective scheme for industrial-scale REO production.
• Kinetic modeling provides a robust tool for predicting and optimizing extraction efficiency.