Abstract Phytosterols in Cucurbita pepo convar . citrullina seed oil were analyzed by GC–MS after extraction the organic solvents, hexane and petroleum ether, supercritical carbon dioxide at 400 bar 40°C. Desmosterol, campesterol, stigmasterol, β‐sitosterol, spinasterol, Δ7,22,25‐stigmastatrienol, Δ7‐stigmastenol, Δ7,25‐stigmastadienol, Δ7‐avenasterol identified mass spectrometrically via detection of parent molecular ions fragmentation patterns corresponding trimethylsilyl derivatives. The...

Supercritical fluid extraction (SFE) is one of the relatively new efficient separation method for essential oils from different plant materials. The products, extracts, can be used as a good base production pharmaceutical drugs and additives in perfume, cosmetic, food industries. aim this work was to analyze supercritical carbon dioxide (SC-CO2) selected spice In paper process parameters such pressure, temperature, solvent flow rate, size grinding materials, ratio co-solvent were presented...

Supercritical carbon dioxide extraction, as a relatively new separation technique, can be used very efficient process in the production of essential oils and oleoresins from many plant materials. The extracts these materials are good basis for pharmaceutical products ingredients functional foods. This paper deals with supercritical extraction selected oil seeds which little interest classical food industry. In this article parameters such pressure, temperature, solvent flow rate, diameter...

Ground fruits of the common juniper (Juniperus communis L.), with a particle size range from 0.250−0.400 mm, forming bed around 20.00 ± 0.05 g, were extracted supercritical CO2 at pressures 80, 90, and 100 bars temperature 40 °C. The total amount extractable substances or global yield (mass extract/mass raw material) for fluid extraction process varied 0.65 to 4.00% (wt). At each investigated pressure, extract fractions collected in successive time intervals over course analyzed by capillary...

ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTKinematic Viscosities of Binary and Ternary Liquid Mixtures Involving Chloroform, 2-Propanol, 2-Butanol at Several TemperaturesMilan N. SoviljCite this: J. Chem. Eng. Data 1995, 40, 5, 1058–1061Publication Date (Print):September 1, 1995Publication History Published online1 May 2002Published inissue 1 September 1995https://pubs.acs.org/doi/10.1021/je00021a006https://doi.org/10.1021/je00021a006research-articleACS PublicationsRequest reuse...

The multiobjective optimization method was applied in order to improve the droplet size distribution and stability of water-in-oil emulsions composed sunflower pumpkin seed oils as continuous phase, polyglycerol polyricinoleate emulsifier, water dispersed phase sodium chloride co-stabilizer (lipophobe). Three composition factors were varied based on three level Box-Behnken design characteristics obtained measured for each experimental run. mean volume diameter droplets span distribution,...

This paper describes the effect of temperature and moisture content on kinetics oil extraction from corn germ flakes prepared by a dry degermination process. The experiments were carried out according to factorial design 3 2 . in extracted material was varied range 8%–12%, whereas 52.5°C–57.5°C. From method response surfaces, functional dependence established between rate, extraction. On basis this dependence, it concluded that had crucial rate A decrease 12% 8% yielded doubling rate. other...

The object of this study is supercritical carbon dioxide extraction flax seed oil (Linum usitatissimum L.) at the pressures 30, 40 and 50 MPa, temperatures 47 52 ?C, time 4 h, special flows solvent 8.8 kg/(kg h), particle size fractions grinding material 0.16-0.315, 0.315-0.80 0.80-2.00 mm. Supercritical fluid (SFE) on laboratory scale, with interest in influence pressure, temperature, time, ground overall yield was investigated. Experimental results yields were compared data obtained by...

The aim of this work was to contribute the optimized production water-in-oil emulsions with pumpkin seed oil in phase using a high-speed homogenizer. Pumpkin is valuable natural source essential fatty acids and biologically active micronutrients that its nutritive value medical uses, reduce interfacial tension between water phases. Therefore, can be considered as prosperous whose use possibly decrease amount some emulsifier normally involved every emulsification process. A central composite...

The hydrodynamic characteristics of the air water toluene three-phase system in a spray extraction column at 20 °C were examined. average and local hold-up data dispersed phase determined dependence on flow rates continuous, gaseous phases. gas was also measured analyzed. A comparison made two-phase (water - toluene) (air systems.

The hydrodynamic characteristics of the liquid-liquid system toluene-water in a pilot plant spray extraction column were experimentally determined. experimental data for such as dispersed phase holdup, mean droplet size, and axial dispersion coefficient obtained. superficial velocity had great influence on toluene holdup. At same time, strong effect continuous holdup was evident. tendency to increase when ratio characteristic increased. Sauter diameter decreased with increasing remained...

This paper presents the results of determination hydrodynamic characteristics and mass transfer in pilot plate absorption column. The experimental values pressure drop countercurrent flow air water through column were obtained. graphic dependence per unit height layer packing (?P/h) on apparent velocity (Ug) dry charge was shown to be form a quadratic function. From graphical function which shows filling (?P/m) during phases (water air), three fields interaction observed: a) area low load,...

Extraction of nitric acid from aqueous solutions to tributyl phosphate-kerosene solvents has been studied in the concentration regions 2-6 kmol m -3 and 0.5-2 phosphate. At these levels, transfer process is greatly enhanced by interfacial turbulence. This effect was taken into account model suggested for mathematical description extraction kinetics.

This paper is concerned with numerical study of the two-sided lid-driven fluid flow in a staggered cavity. The ANSYS FLUENT commercial software was used for simulation, In one simulated cases lids are moving opposite directions (antiparallel motion) and other they move same direction (parallel motion). Calculation results various Re numbers presented form patterns velocity profiles along central lines compared existing data from literature. general, good agreement found, especially...

Although the non-agitated extraction columns (spray column, packed perforated plate sieve etc) can handle high flow rates and are simple cheap, there have been relatively few applications of these because they suffer from serious backmixing continuous phase. It was shown that is reduced when spray column operated with dense packing drops. Another way increasing efficiency a to introduce an inert gas (air, nitrogen, oxygen) as mixing agent in two-phase liquid-liquid (L-L) system. This method...

The refractive indices of ternary liquid mixtures (2-propanol+2-butanol+ethanol) and (chloroform+2-propanol+2-butanol) were measured at 20, 25, 30, 35?C, atmospheric pressure. results used to calculate the index deviations over entire mole fraction range for mixtures. further fitted empirical correlations (Cibulka Nagata-Tamura, Lopez et al) estimate fitting parameters. Standard average percentage from regression lines are shown. best fit was obtained by Nagata-Tamura correlation. Some...

This paper deals with the supercritical carbon dioxide extraction of pumpkin seed oil (Cucurbita pepo L). Supercritical fluid (SFE) has been used to obtain total lipid extracts from other oilseeds, and it also proved successful in isolation enrichment sterols oilseeds. The SFE on a laboratory scale was investigated thus paper, special interest influence pressure overall yield oil. Extractions were carried out at pressures 15, 25 30 MPa 313 K, temperatures 313, 323, 333 K. extractions...

The continuous-phase axial dispersion coefficients of the three-phase gas-liquid-liquid system in a gas-agitated spray extraction column 10 cm i.d. at 20 °C were examined. used was water as continuous phase, toluene dispersed and air gaseous phase. rise gas phase superficial velocity increased coefficient. A non-linear dependence between coefficient observed. No correlation found velocity. increase hold-up corresponded to slight generated growth comparison made (air-water-toluene) two-phase...

The objective of this study was to investigate the pilot-plant gas absorption packed column hydrodynamics, as well axial mixing in system air-water. pressure drop and phase holdup data were determined dependence on flow rates liquid phases. influence superficial velocities phases dispersion a gas-liquid bed (ID 15 cm) consisting Raschig rings (15x15x2 mm) investigated. measured with U-type manometer, connected bottom top working part column. air-water two-phase calculated ratio volume total...

This paper presents a review of some hydrodynamic parameters in pulsed sieve-plate extraction columns. The liquid-liquid systems these columns were analyzed regarding the effects operating and geometrical parameters. values Sauter mean drop diameter function existing work flow regimes column device defined as mixer-settler, emulsion dispersion regimes. It was concluded that dispersed-phase holdup superficial velocity. An increase induced an interface area system. Knowledge value can be used...

This work presents an overview of the research related to determination hydrodynamic characteristics pulsed packed extraction columns using different liquid-liquid two-phase systems. The following are examined: flooding velocity, mean drop diameter dispersed phase, dispersed-phase holdup, and axial dispersion coefficient. In this paper, effects operating parameters (pulsation superficial velocities phases) on point data taken from literature analyzed. experimental indicate that maximum...