Influence of Process Parameters on the Reaction Kinetics of the Chromium-Catalyzed Trimerization of Ethylene

2010 ◽  
Vol 16 (26) ◽  
pp. 7833-7842 ◽  
Author(s):  
Anina Wöhl ◽  
Wolfgang Müller ◽  
Stephan Peitz ◽  
Normen Peulecke ◽  
Bhaskar R. Aluri ◽  
...  
Keyword(s):  
Reaction Kinetics ◽  
Process Parameters ◽  
Influence Of Process Parameters ◽  
Kinetics Of

scholarly journals Study on Optimization of Wet Milling Process for the Development of Albendazole Containing Nanosuspension with Improved Dissolution

2020 ◽  
Vol 64 (4) ◽  
pp. 401-420
Author(s):  
Viktor Fülöp ◽  
Géza Jakab ◽  
Bence Tóth ◽  
Emese Balogh ◽  
István Antal
Keyword(s):  
Process Parameters ◽  
Dissolution Kinetics ◽  
Polymorphic Transition ◽  
Milling Process ◽  
Process Time ◽  
Wet Milling ◽  
Influence Of Process Parameters ◽  
Freundlich Equation ◽  
Milling Medium ◽  
Kinetics Of

The main objective of this work was to show the potential of the optimization of top-down wet planetary bead milling process parameters (milling speed, process time and size of the milling medium) by Design Of Experiments (DOE) approach for the development of albendazole (ABZ) containing nanosuspension with improved dissolution. In addition, the influence of process parameters (capacity of milling container, applied volume of milling beads, size of the milling medium, milling speed, milling time) on ABZ polymorphic transition has also been investigated. The optimized, milled formula yielded ~ 145.39 times reduction in mean particle size (182.200 ± 1.3130 nm) compared to unmilled dispersion, which demonstrated 13.50 times gain in mean dissolution rate value compared to the unmilled dispersion in medium at pH = 1.2. No lag time values were observed in the dissolution kinetics of the nanosuspension in comparison with the unmilled samples. Moreover, maximal mean solubility value was also improved by 1.45 times compared to the unmilled suspension, in medium at pH = 6.8, supporting the significance of the Ostwald-Freundlich equation. Diffraction pattern comparisons have indicated a polymorphic transition of albendazole to Form II, which was more pronounced in smaller container at high milling speed values and prolonged operations.

scholarly journals Influence of process parameters and pre-treatments on quality and drying kinetics of apple samples

2009 ◽  
Vol 27 (No. 2) ◽  
pp. 88-94 ◽  
Author(s):  
S. Jokić ◽  
D. Velić ◽  
M. Bilić ◽  
J. Lukinac ◽  
M. Planinić ◽  
...  
Keyword(s):  
Process Parameters ◽  
Drying Kinetics ◽  
Hot Water ◽  
Sodium Metabisulfite ◽  
Mixed Solution ◽  
Influence Of Process Parameters ◽  
Treatment Methods ◽  
Drying Kinetic ◽  
Pre Treatment ◽  
Kinetics Of

The aim of this research was to determine the influence of the process parameters and pre-treatment methods on the quality and drying kinetics of apple samples of the Florina variety using standard analytical methods: thermo-gravimetry, rehydration, colorimetry. The Apple samples were dried in a laboratory tray drier at different temperatures (50, 60, and 70°C), airflow velocities (1.5 m/s and 2.75 m/s), and pre-treatment methods (dipping in 0.5% ascorbic acid solution; 0.3% L-cysteine solution; 0.1% 4-hexyl resorcinol solution; 0.5% sodium metabisulfite solution; mixed solution of 0.05% 4-hexyl resorcinol and 0.5% sodium metabisulfite; blanching in hot water at 85°C). According to the drying time, rehydration and colour characteristics, the optimal drying parameters found were: temperature of 60°C and airflow velocity of 2.75 m/s. The drying kinetic equations were estimated using Page’s mathematical model. The results of the estimation showed a good agreement with the experimental data. The best results were achieved when the samples were pre-treated with 4-hexyl resorcinol. Blanching in hot water resulted in a higher drying rate and higher rehydration ratio, but also in unacceptable changes in the colour appearance of the apple samples.

Influence of Ph2PN(R)P(Ph)N(R)H (R=c-Hex,iPr) Ligand Substituents, Modifier, and Process Parameters on Reaction Kinetics of a Chromium-based Catalyst for the Selective Trimerization of Ethylene

ChemCatChem ◽  
2013 ◽  
Vol 6 (2) ◽  
pp. 514-521 ◽  
Author(s):  
Stefan Heinig ◽  
Anina Wöhl ◽  
Wolfgang Müller ◽  
Mohammed H. Al-Hazmi ◽  
Bernd H. Müller ◽  
...  
Keyword(s):  
Reaction Kinetics ◽  
Process Parameters ◽  
Kinetics Of

Impact Of Synthesis Route on the Water Oxidation Kinetics of Hematite Photoanodes

2020 ◽  
Author(s):  
Camilo A. Mesa ◽  
Ludmilla Steier ◽  
Benjamin Moss ◽  
Laia Francàs ◽  
James E. Thorne ◽  
...  
Keyword(s):  
Oxygen Vacancy ◽  
Reaction Kinetics ◽  
Water Oxidation ◽  
Oxidation Kinetics ◽  
Oxidation Reaction ◽  
Charge Accumulation ◽  
Optical Signals ◽  
Current Voltage ◽  
Voltage Performance ◽  
Kinetics Of

<p><i>Operando</i> spectroelectrochemical analysis is used to determine the water oxidation reaction kinetics for hematite photoanodes prepared using four different synthetic procedures. Whilst these photoanodes exhibit very different current / voltage performance, their underlying water oxidation kinetics are found to be almost invariant. Lower photoanode performance was found to correlate with the observation of optical signals indicative of charge accumulation in mid-gap oxygen vacancy states, indicating these states do not contribute directly to water oxidation.</p>

Influence of Process Parameters on the Morphologies of Micro-Injection Molded Polyformaldehyde Parts

2019 ◽  
Vol 34 (3) ◽  
pp. 367-375
Author(s):  
L.-X. Wang ◽  
D.-F. Wang ◽  
L. Jiang ◽  
N. Bian ◽  
Q. Li ◽  
...  
Keyword(s):  
Process Parameters ◽  
Influence Of Process Parameters ◽  
Injection Molded
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