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Supercritical Fluid Fractionation of liquid mixtures, generally operated in continuous mode with carbon dioxide as solvent, possibly added with a co-solvent (ethanol most often) to increase its polarity. The equipment mainly consists in a fractionation column through which the supercritical solvent and the raw material flow counter-currently, and separations sections where both extract/fluid and raffinate/fluid are separated, the fluid being recycled through condensation and liquid pumping. |
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Supercritical Fluid Fractionation Process |
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The schematic process diagram shown above describes the "classical" batch extraction process. The equipment is composed of one or several extractors consisting in high pressure autoclave(s) with fast-opening systems in which the material to be treated is set inside a “ basket ” easy to put in and to remove, and a separation section where extract and fluid are separated prior to fluid recycle through condensation and liquid pumping. The major issue of such operation is the fact that it is a batch process.
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Some examples of fractionations
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The extraction of aromas from fermented and distilled beverages |
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SEPAREX developed a complex process in order to obtain high grade aromatic extracts from distilled beverages. Basically, this process consists in a counter-current extraction by supercritical CO2 in mild conditions ; a very high yield is obtained and the raffinate is considered as totally "flat" of aromatic compounds and is sent to distillation for ethanol recovery. |
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New concept of supercritical fluid fractionation of lipids |
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Highly-selective fractionation of lipids has been developed for the following applications: purification of specialty oils: fish oil deodorization & discoloration, polyunsaturated fatty acid deodorisation
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- Separation of mono-, di- and tri-glycerides
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- Fractionation of polyunsaturated fatty acid esters like EPA/DHA
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- Concentration/purification of sterols and tocopherols
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- Separation of sphingolipids, glycolipids (monogalactosyl-diglycerides – MGDG - and digalactosyl-diglycerides – DGDG -) and phospholipids from wheat gluten oil
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Fractionation - Inorganic Materials & Polymers |
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SEPAREX has developed many high selectivity processes on organic or inorganic products among which : Polymer fractionation (Pharmaceutical poloxamer, hard-disk lubricants perfluoro-alkyl ethers), aromas from alcoholic beverages (rum, cognac, whisky, beer, wine, …), citrus oil deterpenation, chemical purification, waste water pollution abatment, etc... |
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The most important application is related to the fractionation of lubricants for hard-disk industry. |
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High performance hard disk lubricants fractionation |
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Improvement in lubrication performance is one of the keys to advancements in magnetic disk drive technology. This performance can be significantly enhanced by using highly consistent and reproducible molecular weight fractions of perfluoropolyalkylethers (PFPE's). The means for fractionating PFPE's has been developed using supercritical fluid technology. Supercritical CO2 is an excellent solvent for PFPE’s and, unlike organic solvents, it is a "tunable" solvent that can extract step-by-step narrow fractions of PFPE by simply modifying temperature and pressure in step-wise fashion. |
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High quality lubricant fractions are obtained from various raw materials with different end-groups (-alcohol ; -di-alcohol ; -phenyl ; …), from raw materials supplied by Solvay Solexis according the trademark FOMBLIN? with various commercial names: |
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Z-DOL 2000 and 4000: |
- HO - CH2 - CF2 -(- O - CF2 - CF2-)n -(- O - CF2 -)m- O - CF2 - CH2 - OH
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AM 2001 or 3001 |
- C6H5-CH2-O-CO-O-CH2-CF2-(-O-CF2-CF2-)n-(-O-CF2-)m-O-CF2-CH2-O-CO-O-CH2-C6H5
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Z-TETRAOL 2000 |
- HO-CH2-CHOH-CH2-O-CH2-CF2-(-O-CF2-CF2-)n-(-O-CF2-)m-O-CF2-CH2-O-CHOH-CH2-OH
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Each lubricant fraction is characterized by F19-NMR for determination of the average molecular mass (Mn) and Gel Permeation Chromatography (GPC). Very narrow fractions are obtained as shown on figure below where the GPC chromatograms of the raw material (Z-DOL 4000) and fractions collected are compared. |
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 实验室超临界萃取仪 中试超临界萃取设备 工业超临界萃取设备 |
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