What are the main disadvantages of supercritical fluid extraction? The introduction of strong polar groups (-OH, -COOH) makes extraction difficult. In the range of benzene derivatives, substances with three hydroxyl phenols and compounds with one carboxyl group and two hydroxyl groups can still be extracted, but compounds with one carbonyl group and more than three hydroxyl groups cannot be extracted. More polar substances, such as sugars, are difficult to extract below 40 MPa. The higher the relative molecular mass of the compound, the more difficult the extraction is. The main disadvantage of supercritical CO2 extraction is the expensive equipment and analytical process. The main disadvantage of SFE is that the extraction must be performed at the high pressures (100-1,000 bar) required to maintain the solvent in a supercritical state. This means shorter processing times, i.e. a smoother and gentler way to produce more potent components. This creates greater value for commercial use. The result is higher capital and operating costs. Is CO2 extraction better than cold pressing? Supercritical CO2 extraction is the best choice because an oxygen-free environment and low temperatures are especially important when extracting fragile oils such as essential oils from plants. By maintaining low temperatures and extracting all the "active" components, SC-CO2 extraction preserves and protects the complete botanical, skin-friendly properties of the essential oils. For example, the SC-CO2 process provides twice the regenerated sterols and five times the carotenoids of regular rosehip seed oil. This also means it lasts four times longer in your bathroom cabinet! CO2 extraction also leaves absolutely no solvent residue, so the purity of the final plant essential oil is impeccable. The low temperature and lack of waste streams/emissions also make it a very environmentally friendly process! What are the main advantages of using supercritical fluids versus conventional fluids in the extraction process? 7 Advantages of Supercritical CO2 Fluid Extraction The advantages of using SFE compared to conventional methods are Higher selectivity, since the solventizing ability of the fluid can be adjusted by changing the temperature and pressure. lower viscosity and higher diffusivity of supercritical fluids allowing faster mass transfer of solutes from porous plant materials the SFE can be carried out at low temperatures, which makes the process well suited for the extraction of thermally unstable compounds extracts dissolved in supercritical carbon dioxide can be separated by decompression with virtually no solvent residue the SFE unit can be coupled to GC-MS or NMR, allowing immediate extraction, analysis and quantification of the extracted molecules SFE can be performed at different scales: analytical (less than 1 gram of sample), preparative (hundreds of grams of sample), pilot (kilograms of sample) and industrial (tons of sample). Finally, on an industrial scale, supercritical CO2 is often reused, thus minimizing waste generation. Comparison of SFE with conventional methods The supercritical CO2 extraction of clove oil was also compared with several conventional methods. The results showed that SFE achieved an oil recovery of 19.6% (mass fraction), which is nearly double the yield of water distillation and hydrodistillation. The highest content (78.4%, mass fraction) of the main active substance phenolics (eugenol + acetyl eugenol) was also obtained. Meanwhile, the SFE extraction time was short (2h), no solvent residue, and the product was a high-quality light yellow oil. Water distillation The darker the color of the distilled essential oil, the more serious the pyrolysis, the lower the oil yield and the solvent residue. Soxhlet When using anhydrous ethanol as the solvent, the extract obtained by soxhlet extraction was a brown extract and it was difficult to obtain light yellow clove oil, which required post-treatment. The results showed that the supercritical CO2 extraction technique of clove oil was far superior to other extraction methods. Photo of supercritical CO2 extraction machine 300L supercritical CO2 extractor 300L supercritical CO2 extractor Supercritical CO2 Extractor 300L Supercritical CO2 Extractor 300L Supercritical CO2 Extractor300L Supercritical CO2 Extractor 200L Supercritical CO2 Extraction System200L Supercritical CO2 Extraction System 200L (50L×4) Supercritical CO2 Extractor 2100L Supercritical CO2 Extraction Machine2100L Supercritical CO2 Extraction Machine Supercritical CO2 Extraction Machine 2100L Supercritical CO2 Extraction Machine 100L Supercritical CO2 Extractor 100L Supercritical CO2 Extractor Supercritical carbon dioxide extraction system 1000L supercritical carbon dioxide extraction machine Supercritical Carbon Dioxide Extraction Machine 100L Supercritical Carbon Dioxide Extraction Machine 3 minutes expertise reading Solubility of solutes in supercritical carbon dioxide The study of solute solubility in supercritical CO 2 is of theoretical and practical application. The solubility law of CO 2 summarized by the research results of Francisi, Stahl, Hyatt and other scholars is useful for the preliminary understanding of the solubility and selectivity of various solutes in supercritical CO 2 . The solubility rules are as follows Rule 1 The solubility values of solutes in subcritical CO 2 and supercritical CO 2 generally differ by about one order of magnitude, but no substance has ever been found to be insoluble in subcritical CO 2 but dissolved in a supercritical state, indicating that the substance is in subcritical CO 2. The dissolution behavior of CO 2 and supercritical CO 2 is continuous. Rule 2 CO 2 has a strong homogenizing effect. Studies have shown that at least 140 compounds can form homogeneous miscible states with CO 2 at moderate pressure and room temperature, i.e., liquid CO 2 and supercritical CO 2 can be miscible with many nonpolar and weakly polar solutes, such as n-alkanes with less than 12 carbon atoms, n-olefins with less than 10 carbon atoms, lower alcohols with less than 6 carbon atoms in the main chain, and lower fatty acids with less than 10 carbon atoms in the main chain. Esters with the number of carbon atoms in the main chain of alcohols less than or equal to 12, low carbon aldehydes with carbon atoms less than 7, low carbon ketones with carbon atoms less than 8, ethers with low carbon atoms less than 4, etc. Rule 3 Although liquid CO 2 and supercritical CO 2 at medium pressure have excellent solubility for the above aliphatic hydrocarbons and low-polar lipophilic compounds, their solubility in liquid CO 2 and supercritical CO 2 changes from a miscible state to a partially soluble state and decreases gradually as the number of carbon atoms increases, i.e., as the chain length and molecular weight increase. Rule 4 The introduction of strong polar functional groups (e.g. O11COD) decreases the solubility of the compound, so the solubility in polyols, polyacids, polyhydroxy and carboxyl groups and supercritical CO 2 is extremely low. Rule 5 Liquid CO 2 and supercritical CO 2 are suitable for most inorganic inorganic salts, strongly polar substances (e.g., sugars, amino acids, starch, proteins, etc.) are almost insoluble and therefore not extracted at subsupercritical and supercritical CO 2 Extraction process Rule 6 Liquid CO 2 and supercritical CO 2 are practically insoluble in compounds with molecular weights greater than 500 Summary The above rules provide a reference for the initial qualitative determination of whether a substance can be extracted using supercritical CO 2 as an extraction solvent, and also when co-reagents (cden) need to be added during the CO 2 extraction process.
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  • Is CO2 extraction better than cold pressing?
    Supercritical CO2 extraction is the best choice because an oxygen-free environment and low temperatures are especially important when extracting fragile oils such as essential oils from plants.

    By maintaining low temperatures and extracting all the "active" components, SC-CO2 extraction preserves and protects the complete botanical, skin-friendly properties of the essential oils.
    Is CO2 extraction better than cold pressing? Supercritical CO2 extraction is the best choice because an oxygen-free environment and low temperatures are especially important when extracting fragile oils such as essential oils from plants. By maintaining low temperatures and extracting all the "active" components, SC-CO2 extraction preserves and protects the complete botanical, skin-friendly properties of the essential oils.
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  • The main disadvantage of supercritical CO2 extraction is the expensive equipment and analytical process.
    The main disadvantage of SFE is that the extraction must be performed at the high pressures (100-1,000 bar) required to maintain the solvent in a supercritical state. This means shorter processing times, i.e. a smoother and gentler way to produce more potent components. This creates greater value for commercial use. The result is higher capital and operating costs.
    The main disadvantage of supercritical CO2 extraction is the expensive equipment and analytical process. The main disadvantage of SFE is that the extraction must be performed at the high pressures (100-1,000 bar) required to maintain the solvent in a supercritical state. This means shorter processing times, i.e. a smoother and gentler way to produce more potent components. This creates greater value for commercial use. The result is higher capital and operating costs.
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  • What are the main disadvantages of supercritical fluid extraction?
    The introduction of strong polar groups (-OH, -COOH) makes extraction difficult.
    In the range of benzene derivatives, substances with three hydroxyl phenols and compounds with one carboxyl group and two hydroxyl groups can still be extracted, but compounds with one carbonyl group and more than three hydroxyl groups cannot be extracted.
    More polar substances, such as sugars, are difficult to extract below 40 MPa.
    The higher the relative molecular mass of the compound, the more difficult the extraction is.
    The main disadvantage of supercritical CO2 extraction is the expensive equipment and analytical process.
    The main disadvantage of SFE is that the extraction must be performed at the high pressures (100-1,000 bar) required to maintain the solvent in a supercritical state. This means shorter processing times, i.e. a smoother and gentler way to produce more potent components. This creates greater value for commercial use. The result is higher capital and operating costs.

    Is CO2 extraction better than cold pressing?
    Supercritical CO2 extraction is the best choice because an oxygen-free environment and low temperatures are especially important when extracting fragile oils such as essential oils from plants.
    What are the main disadvantages of supercritical fluid extraction? The introduction of strong polar groups (-OH, -COOH) makes extraction difficult. In the range of benzene derivatives, substances with three hydroxyl phenols and compounds with one carboxyl group and two hydroxyl groups can still be extracted, but compounds with one carbonyl group and more than three hydroxyl groups cannot be extracted. More polar substances, such as sugars, are difficult to extract below 40 MPa. The higher the relative molecular mass of the compound, the more difficult the extraction is. The main disadvantage of supercritical CO2 extraction is the expensive equipment and analytical process. The main disadvantage of SFE is that the extraction must be performed at the high pressures (100-1,000 bar) required to maintain the solvent in a supercritical state. This means shorter processing times, i.e. a smoother and gentler way to produce more potent components. This creates greater value for commercial use. The result is higher capital and operating costs. Is CO2 extraction better than cold pressing? Supercritical CO2 extraction is the best choice because an oxygen-free environment and low temperatures are especially important when extracting fragile oils such as essential oils from plants.
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