Supercritical carbon dioxide extraction and subcritical extraction are two different physical extraction processes, which have their own characteristics in extracting cumin oil.
technical principle
Supercritical carbon dioxide extraction technology utilizes the properties of carbon dioxide in a supercritical state (high pressure and high temperature), where carbon dioxide has the density of a liquid and the diffusivity of a gas, to effectively extract the active components from plant materials.
Subcritical extraction technology is an extraction process that uses a subcritical fluid (such as butane, propane, etc.) at temperatures below its critical temperature but above its boiling point.
process conditions
Supercritical carbon dioxide extraction:
Medium: Use carbon dioxide as extractant.
Pressure: The operating pressure is usually between 20-50MPa.
Temperature: The operating temperature is usually above 40℃.
Subcritical extraction:
Medium: Mainly use butane, propane, dimethyl ether and other five solvents.
Pressure: The operating pressure is low, usually between 0.3-0.5MPa.
Temperature: Operating temperature is room temperature or lower.
Respective advantages
The advantages of supercritical carbon dioxide extraction include high extraction efficiency, no solvent residue, ability to retain heat-sensitive components, and good environmental protection.
In the process of extracting cumin oil, supercritical carbon dioxide extraction can be carried out at close to room temperature, effectively preventing oxidation and escape of heat-sensitive substances, and maintaining all components of medicinal plants. It can obtain higher yield and better aroma, and its composition is closer to the natural state than the traditional steam distillation method.
The advantages of subcritical extraction include low operating pressure, simple process, low energy consumption, less investment, and easy industrial large-scale production.
In the extraction of cumin oil, it can solve the defects of small volume, high cost, large energy consumption and difficult large-scale industrial production of supercritical extraction equipment, while maintaining high extraction efficiency and product quality. Compared with supercritical carbon dioxide extraction, subcritical extraction equipment has lower cost and less energy consumption, and is more suitable for industrial large-scale production.
The quality requirements, production cost, equipment investment, energy consumption and environmental protection requirements of cumin oil should be considered when selecting supercritical carbon dioxide and subcritical extraction methods. Supercritical carbon dioxide extraction is suitable for the occasions with high requirements on product quality, while subcritical extraction is suitable for the occasions with high requirements on cost and production efficiency.