The influence of operational parameters under different temperatures, pressures and flow rates on the supercritical fluid extraction (SFE) of the oil from Pinus gerardiana was investigated. Extraction was designed using Box Behnken Design (BBD) and the artificial neural network (ANN). Furthermore, broken and intact cells (BIC) mathematical model was used to consider mass transfer kinetics of extracted

The Concomitant polymorphism of one of the sulphur‐containing essential amino acids dl‐Methionine was revealed and α and β polymorphic forms were separated from aqueous solution at 35°C through antisolvent crystallization method with ethanol as antisolvent. The addition of different volume fractions of ethanol into the mother solution reduces the solubility of dl‐Methionine in double‐distilled water

In this work, Dry Reforming Methane (DRM) over Ni/ɣ‐MgO catalysts in a coaxial dielectric barrier discharge (DBD) was investigated, and the results were compared without catalysts. Firstly, Ni/MgO, Ni/5%CeO2/MgO, and Ni/7%CeO2/MgO were prepared, and their characteristic were specified (XRD) then partially packed into the DBD reactor. Various parameters such as discharge power, flow rate and molar ratio

Agitated‐pulsed column (APC) is expected to show good transfer. In this study, the dispersed phase holdup and characteristic velocity were measured using a 25mm diameter APC. The results show that holdup declined at first and then escalated with the increase of pulsation intensity which was in contrary to the trend of the characteristic velocity change. The pulsation intensity corresponding to minimum

Solubility of Etoricoxib in SC‐CO2 was measured using gravimetric method in wide range of pressure and temperature. A PVT cell was designed and used. Different solubility values were obtained between 2.34×10‐5 to 7.96×10‐4 mole fraction, depending on the applied pressure and temperature. Analyzing the solubility curves revealed that pressure had direct effect on the solubility of Etoricoxib in all

The accurate determination of physical properties of filtration media is essential for predicting their performance for bag filtration use. The spatial distributions of fiber mass, air permeability, and thickness of three commercially available filtration media were evaluated and compared with the manufacturer's indicated values. The fiber mass and air permeability were distributed over a wide range

An understanding of rheology is vital in polymer processing as it depicts the complex molecular structure, viscoelastic nature and insights on dynamic mechanical properties of these macromolecules. In this study, graphite powder subjected to different steps of modification like H2SO4 intercalation, silanization and finally Fe3O4 & BaFe12O19 grafting was used. Changes in viscous behavior was obvious

Rates of mass transfer at a rotating cylinder of the hexagonal cross‐section were measured by using the limiting current method. Factors considered were cylinder rotation speed, geometrical dimensions, physical features of the liquid, and the existence of drag‐decreasing polymers. The existence of Polyox WSR‐301 drag‐reducing polymer diminished the speed of mass transfer to an extent ranged from 2

To detect adulteration in gasoline, an automatic distillation apparatus was set up to measure the recovered volume and temperature simultaneously. The level metering was performed by online image processing instead of the conventional visual operator based measurement. To investigate the effect of additives in super gasoline, regular gasoline and diesel in the range of 2‐10% and 4‐26%, respectively

Knowledge of cycle times is essential in order to design spouted beds. Although experiments for determining cycle times are time consuming, there is hardly any mechanistic or empirical model for their prediction. Two types of artificial neural networks (single and multiple output ones) have been developed in this study to estimate particle cycle times in conical spouted beds, and they provide satisfactory

Advancement in the nanotechnology has produced a plethora of nanomaterials with unique characteristics leading to various applications. Amidst many organic and inorganic nanomaterials, zinc oxide is one of the best inorganic material which was recognized as the best antimicrobial agent. The aim of this research work was to fabricate the zinc oxide nanoparticles (ZnO) through green approach using three

Carbon nanotubes and nanoporous activated carbons are as an adsorbent for H2 storage, which carbon nanotubes prepared by special Chemical Vapor Deposition (CVD) method over a Co‐Mo/MgO catalyst and nanoporous activated were prepared from walnut shells. According to the Fourier‐Transform Infrared (FTIR) analysis, the oxygenated functional groups have been formed on the structures. The X‐ray diffraction

Ni‐based catalysts present highly interesting performance for the reductive amination of cyclohexanol (CHOL). The stability of a commercial Ni‐based catalyst was evaluated in this work, being observed a high stability over the tested time‐on‐stream (TOS). Reaction network was evaluated by analysis of selectivities profiles as a function of CHOL conversion. The formation of cyclohexylamine (CHA) was

An approach to isolate first crystals for molecules prone to liquid‐liquid phase separation (LLPS) is described. In the absence of knowledge about the solubility of a hypothetical crystal, it is proposed to determine the LLPS phase boundary then operate at a temperature of 2oC above the LLPS to maximize the supersaturation with respect to a hypothetical crystalline phase and to avoid LLPS. The proposed

The partition evolution of parent calcium carbonate and its effect on the catalyzed sintering of regenerated CaO during calcium looping cycles were experimentally investigated by scanning electron microscopy, X‒ray diffractometry and nitrogen adsorption‒desorption method. The carbonation reaction rate has a heterogeneous distribution either in the particle radial direction or in the same layer, which

Diesel‐contaminated soil was treated with Fenton's oxidant, from hydrogen peroxide. Soil samples were collected during the earthmoving of RNEST Oil Refinery (Petrobras). A factorial design 33 evidenced that the concentration of iron ions [Fe2+] was the variable with the most statistically significant effect in all experiments. The oxidation efficiency was 57 % of TOC and 78 % of polycyclic aromatic

Local velocities of bubbles rising in four different nanosilica solutions were investigated experimentally. Also, density, viscosity and surface tension of fumed nanosilica and modifeid ones solutions were measured. Heat treatment and chemical functionalization have used to modified the properties of silica nanoparticles. It is found that, addition of nanosilica affected the rising bubble hydrodynamics

Chitosan was dispersed on bentonite for the preparation of a Cd2+ adsorbent. The adsorption process followed a Freundlich isotherm, and the experimental adsorption capacity reached 168.7 mg/g. For the understanding of adsorption mechanism, the pristine and Cd‐doped adsorbents were analyzed by FTIR and XPS, and red shift of the band corresponding to amino groups was observed, while Cd 3d binding energy

Multiphase flows are of major importance in today's industrial processes as many products originate from gas‐liquid reactions. The hydrodynamics within the bubbles wake are essential as product selectivity is determined by the residence times inside these mixing zones, especially when the gas phase is consumed, for example, by a competitive consecutive reaction. Magnetic resonance imaging offers a

Owing to the increased use of nanoparticles in engineering industries, the development of separation techniques to isolate nanoparticles grew as important as the one to isolate micro‐ or macro‐sized particles. Centrifugation, filtration, and precipitation are the common processes used to separate nanoparticles from a suspension; interestingly, these processes work best if the nanoparticles are pre‐flocculated