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1
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CFD analysis of mixing intensity in jet stirred reactors

100%
Gil I., Mocek P.
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vol. 33
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issue 3
397-410
EN
The homogeneous stirred reactor designed for kinetic studies of the combustion of hydrocarbons with intensive internal recirculation in high temperature combustion chamber is described. The originality of our reactor lies in its construction which allows to intensively mix fuel and flue gases, measure gas temperature as well as obtain samples which can be used to investigate diffusion flames. The cylindrical construction enables to use the reactor in laboratory cylindrical electrically heated ovens. The CFD analysis of the reactors, the mixing parameters (turbulent Peclet number and mixing level) and the volume average temperature in the reactors were elaborated on the basis of the typical dimensions of classical reactors to kinetics research as well as the own reactor design. The results of the analysis allow to reveal advantages of our construction.
2
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Adsorption of penicillin by decaffeinated tea waste

88%
Gharbani P., Mehrizad A., Jafarpour I.
Polish Journal of Chemical Technology
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2015
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vol. 17
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issue 3
95-99
EN
Removal of penicillin has been investigated using decaffeinated tea waste (DCTW). Decaffeination of tea waste was investigated using different methods. Results indicate that ozonation was the most effective process for removal of penicillin. Batch adsorption experiments were completed at various temperatures (20, 30, and 40°C), DCTW dosages (2, 4, 6, 8, and 10 g per 250 mL), penicillin concentrations (4, 10, and 14 mg/L), and pH (3, 7, and 10) conditions. Studies showed that adsorption reaches equilibrium within 40 min. The main factor affecting adsorption of penicillin was the solution pH, with maximum adsorption occurring at pH 3. Higher adsorbent dosages and lower penicillin concentrations also resulted in higher percentages of penicillin removal. Results show that data obeyed the pseudo-first-order kinetic and Freundlich isotherm models. This process proves that low-cost DCTW could be used as a high performance adsorbent for removing penicillin from aqueous solutions.
3
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Hydrodynamic and kinetic study of an elution of a high viscosity liquid from the sand bed using eluent of low viscosity

88%
Sęk J., Błaszczyk M., Bartos M.
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vol. 33
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issue 1
31-41
EN
The study was aimed to determine the hydrodynamic of water seepage through a porous bed saturated with different amounts of high viscosity liquids. An attempt was made to describe the process of seepage through beds saturated with oils using the theory of outflow of a liquid from the tank. It was assumed that the discharge coefficient will represent changes of flow resistance during the process. It was found that the dependence of this factor on time is linear. In the second part of this work kinetics of the seepage process was investigated. Dependence of oil concentrations, eluted from the deposit with the flowing water, on time has been evaluated. Thanks to these studies it was possible to determine the effectiveness of an elution of high viscosity liquids from porous beds using water as the washing out liquid.
4
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In vitro effects of compounds isolated from Sideritis brevibracteata on bovine kidney cortex glutathione reductase

88%
Tandogan B., Güvenç A., Çalış İ., Ulusu N. N.
Acta Biochimica Polonica
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2011
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vol. 58
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issue 4
471-475
EN
Glutathione reductase (GR, E.C 1.6.4.2) is a flavoprotein that catalyzes NADPH-dependent reduction of oxidized glutathione (GSSG) to reduced glutathione (GSH). The aim of this study was to investigate in vitro effects of phenolic compounds isolated from Sideritis brevibracteata on bovine kidney GR. The Sideritis species are widely found in nature and commonly used as medicinal plants. 7-O-glycosides of 8-OH-flavones (hypolaetin, isoscutellarein and 3'-hydroxy-4'-O-methylisoscutellarein) were isolated from aerial parts of Sideritis brevibracteata. These compounds inhibited bovine kidney cortex GR in a concentration-dependent manner. Kinetic characterization of the inhibition was also performed.
5
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Mass transfer in the bath reactor of the adsorption process of 1,2-dichloropropane from aqueous solution onto the activated carbon

88%
Pełech R.
Polish Journal of Chemical Technology
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2007
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vol. 9
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issue 2
30-33
EN
A pseudo-second order rate equation describing the kinetics of the adsorption of 1,2-dichloropropane from aqueous solution onto the activated carbon at different initial concentrations, adsorbent dose, temperature, particle diameter and the rate of stirring have been developed. The rate constant was calculated. The rate constant correlation in a good mixing conditions was described as a function of the temperature.
6
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Content available

CFD analysis of mixing intensity in jet stirred reactors

88%
Gil I., Mocek P.
Chemical and Process Engineering
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2012
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issue 3
7
Publication available in full text mode
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The influence of steric stabilization on process of Au, Pt nanoparticles formation

75%
Luty-Błocho M.
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issue 1
8
Content available remote

Utilization of agricultural and industrial wastes for metal removal from aqueous solutions

75%
Biegańska M., Cierpiszewski R.
Polish Journal of Chemical Technology
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2011
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vol. 13
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issue 1
20-22
EN
In this study a possibility of obtaining sorbents from basketry wastes has been investigated. Therefore, adsorption of cadmium ions on wicker bark of Salix americana has been studied. The obtained experimental results were described by the Freundlich equation and adsorption kinetics by the pseudo-second order equation. The effect of pH on cadmium ions adsorption by S. americana was also investigated. It has been found that for the pH values ranging from 2 to 7 cadmium removal from the solution was held at almost constant level.
9
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Content available

Hydrodynamic and kinetic study of an elution of a high viscosity liquid from the sand bed using eluent of low viscosity

75%
Sęk J., Błaszczyk M., Bartos M.
Chemical and Process Engineering
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2012
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issue 1
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