“…The measurements were made through the use of an experimental CO 2 apparatus ( Fig. 1) [19,20]. The apparatus provides an opportunity to make complex researches of extracting processes at pressures up to 400 bar and temperature intervals from 25 to 100°C with the maximum flow of supercritical fluid of 1.7 ( ± 0.05) kg/h.…”
The present study was conducted to check the comparative qualities of essential oils prepared by hydrodistillation (HD) and supercritical fluid techniques. It constitutes the first attempt to investigate the chemical composition of Daucus carota subsp. maritimus extracts using supercritical fluid technology (SFE) as an environmentally clean innovative method of extraction. The effect of pressure on the nature of extractable substances from wild carrot has been performed at a constant temperature of 50°C and two different pressures (100 and 300 bar). The experimental results showed that pressure had a significant enhancing effect on the fluid transport properties and therefore on yield values. The extraction yield increases from 1.167 to 2.986% while increasing pressure. The chemical compositions of the essential oils prepared by HD and SFE were analyzed on the basis of gas chromatography-mass spectroscopy (GC-MS). Thus, we noticed that all analyzed samples were enriched in geranyl acetate and β-bisabolene, and that the quantities of different identified substances were extremely sensitive to the extraction method and to the pressure variation in case of SFE.
“…The measurements were made through the use of an experimental CO 2 apparatus ( Fig. 1) [19,20]. The apparatus provides an opportunity to make complex researches of extracting processes at pressures up to 400 bar and temperature intervals from 25 to 100°C with the maximum flow of supercritical fluid of 1.7 ( ± 0.05) kg/h.…”
The present study was conducted to check the comparative qualities of essential oils prepared by hydrodistillation (HD) and supercritical fluid techniques. It constitutes the first attempt to investigate the chemical composition of Daucus carota subsp. maritimus extracts using supercritical fluid technology (SFE) as an environmentally clean innovative method of extraction. The effect of pressure on the nature of extractable substances from wild carrot has been performed at a constant temperature of 50°C and two different pressures (100 and 300 bar). The experimental results showed that pressure had a significant enhancing effect on the fluid transport properties and therefore on yield values. The extraction yield increases from 1.167 to 2.986% while increasing pressure. The chemical compositions of the essential oils prepared by HD and SFE were analyzed on the basis of gas chromatography-mass spectroscopy (GC-MS). Thus, we noticed that all analyzed samples were enriched in geranyl acetate and β-bisabolene, and that the quantities of different identified substances were extremely sensitive to the extraction method and to the pressure variation in case of SFE.
“…In a next step, the products are extracted with an organic solvent. As an alternative, extraction with supercritical CO 2 is also developed [221][222][223][224][225]. Supercritical CO 2 extraction has several advantages: The extraction efficiency is high since the fluid density and consequently the solvent quality can be controlled by changes of pressure or temperature, it allows for low-temperature processing, is non-toxic, nonflammable, and the supercritical solvent can easily be removed [224,226,227].…”
Section: Downstream Processing and Purificationmentioning
The engineering of algae strains, cultivation, and further processing steps in microalgae production are considered in view of the utilization of microalgae lipids for chemicals. Insights from biofuel production trials on the one hand and existing processes for very high-value pharmaceuticals on the other hand are instructive to this end. A recent example of the production of a surfactant from chemical intermediates gained from algae oil and further opportunities are discussed.
“…Для получения жирных кислот для последующей переэтерификации их в биотопливо оптимально подходит сверхкритическая флюидная экстракция, поскольку данная методика позволяет влиять на состав получаемых экстрактов простым изменением давления и температуры процесса [15]. В Республике Дагестан активно развиваются технологии сверхкритической экстракции, в том числе для применения при переработке микроводорослей [16][17][18][19]. В этих работах в качестве объектов исследования были выбраны микроводоросли Nannochloropsis salina, любезно предоставленные американской компанией Solix (рис.…”