A rising temperature kinetic model to describe complex reaction kinetics of a drug: procainamide hydrochloride

2000 ◽  
Vol 357-358 ◽  
pp. 15-22 ◽  
Author(s):  
Lori Burnham ◽  
David Dollimore ◽  
Ken Alexander
Keyword(s):  
Kinetic Model ◽  
Reaction Kinetics ◽  
Complex Reaction ◽  
Kinetics Of

DEVELOPING OF MATLAB APPLICATION FOR DETERMINING THE REACTION KINETICS OF RUBBER VULCANIZATION PROCESS

2021 ◽  
Author(s):  
Dario Balaban ◽  
◽  
Jelena Lubura ◽  
Predrag Kojić ◽  
Jelena Pavličević ◽  
...  
Keyword(s):  
Kinetic Model ◽  
Reaction Kinetics ◽  
Kinetic Parameters ◽  
Degradation Process ◽  
Complex Process ◽  
Quality Of Fit ◽  
Kinetics Of ◽  
Vulcanization Process

Rubber vulcanization is kinetically a complex process, since it consists of two simultaneous reactions: curing and degradation. To determine reaction kinetics, it is necessary to determine a kinetic model which describes the process adequately. Proposed kinetic model has six adjustable parameters. In order to determine kinetic parameters of the proposed kinetic model, commercially available rubber gum was used. Oscillating disc rheometer was used to investigate experimental dependence of torque on time, at six temperatures in the range from 130 to 180 °C, with a step of 10 °C. Matlab application, built via App Designer feature, was developed in order to fit the experimental data to the proposed kinetic model. Developed Matlab application, consisting of two tabs, enables user to upload raw rheometer data, perform manual fitting or automatic fitting (manual or automatic estimation of initial values of adjustable parameters), test the effect of constant values of some kinetic parameters on the overall quality of fit, visualize the dependence of kinetic parameters on temperature and to determine the values of Arrhenius expression for curing and degradation process. Both fitting methods were proven to be efficient; overall determination coefficient and MAPE value for automatic and manual fitting methods were >0.99 and <1%, and >0.999 and <1%, respectively. Arrhenius parameters were also determined with high accuracy (R2>0.98). Developed application enables simple and efficient determination of kinetic parameters by means of different fitting methods, simultaneous fitting of data on all temperatures, and testing the effect of constant kinetic parameters values on fitting results

scholarly journals Anionic Polymerization of ε-Caprolactam under the Influence of Water: 2. Kinetic Model

2020 ◽  
Vol 4 (1) ◽  
pp. 8 ◽  
Author(s):  
Rainer Wendel ◽  
Philipp Rosenberg ◽  
Michael Wilhelm ◽  
Frank Henning
Keyword(s):  
Experimental Data ◽  
Kinetic Model ◽  
Reaction Kinetics ◽  
Water Content ◽  
Anionic Polymerization ◽  
Polyamide 6 ◽  
External Influences ◽  
Influence Of Water ◽  
Kinetics Of

The reaction kinetics of anionic polymerization for the production of anionic polyamide 6 (aPA6) are widely understood. It is also known that this reaction is very sensitive to external influences such as water. This paper analyzes and quantifies the influence of water on the reaction of ε-caprolactam to anionic polyamide 6. A kinetic model is developed in which the reactive molecules of the activator and catalyst are defined as variables and the concentrations of activator and catalyst as well as water content are considered. A model for the calculation of the reaction kinetics is established and validated with experimental data. The developed model can be used to predict the influence and compensation of water by addition of surplus activator and catalyst during the polymerization of ε-caprolactam.

Simplified reaction kinetics, models and experiments for glyphosate degradation in water by the UV/H2O2process

2015 ◽  
Vol 14 (2) ◽  
pp. 366-377 ◽  
Author(s):  
Eduardo Vidal ◽  
Antonio Negro ◽  
Alberto Cassano ◽  
Cristina Zalazar
Keyword(s):  
Kinetic Model ◽  
Reaction Kinetics ◽  
Degradation Kinetics ◽  
Commercial Formulation ◽  
Kinetics Models ◽  
Glyphosate Degradation ◽  
Kinetics Of

This work reports the degradation kinetics of glyphosate in water employing the UV/H2O2process. The kinetic model was experimentally validated. Results compare the kinetics of the herbicide alone and a commercial formulation.

Polymer looping kinetics in active heterogeneous environments

Soft Matter ◽  
2021 ◽  
Author(s):  
Bingjie Zhang ◽  
Fei Tan ◽  
Nanrong Zhao
Keyword(s):  
Reaction Kinetics ◽  
Langevin Dynamics ◽  
Heterogeneous Environments ◽  
Complex Reaction ◽  
Biological Environment ◽  
Dynamics Simulations ◽  
Kinetics Of

A typical biological environment is usually featured by crowding and heterogeneity, leading to complex reaction kinetics of the immersed macromolecules. In the present work, we adopt Langevin dynamics simulations to...

The Complex Reaction Kinetics of ECHO-1 Virus with Chlorine in Water

1977 ◽  
Vol 156 (3) ◽  
pp. 496-499 ◽  
Author(s):  
D. C. Young ◽  
J. D. Johnson ◽  
D. G. Sharp
Keyword(s):  
Reaction Kinetics ◽  
Complex Reaction ◽  
Kinetics Of

scholarly journals KINETIKA REAKSI SINTHESIS BIOMATERIAL HIDROXYAPATITE DENGAN JENIS PREKURSOR NITRAT DAN ASETAT

REAKTOR ◽  
2014 ◽  
Vol 15 (2) ◽  
pp. 104 ◽  
Author(s):  
Adhi Setiawan ◽  
W Widiyastuti ◽  
Sugeng Winardi ◽  
Agung Nugroho
Keyword(s):  
Activation Energy ◽  
Kinetic Model ◽  
Kinetic Study ◽  
Reaction Kinetics ◽  
Grain Growth ◽  
High Purity ◽  
Growth Kinetic ◽  
The Body ◽  
Nitrate Precursor ◽  
Kinetics Of

Hidroxyapatite (HAp) merupakan salah satu biomaterial yang banyak diaplikasikan dalam dunia medis untuk membuat implant jaringan tubuh terutama tulang dan gigi sehingga kemurnian produk HAp memegang peranan yang cukup penting. Agar diperoleh HAp dengan kemurnian tinggi, kinetika reaksi pembentukan HAp harus diketahui secara jelas. Metode yang digunakan untuk memperoleh kinetika reaksi HAp adalah dengan analisis TG-DTA  yang dilakukan pada dua jenis prekursor HAp yaitu asetat dan nitrat. Metode TG-DTA tersebut dilakukan dengan memanaskan prekursor HAp dengan variasi laju pemanasan 10, 15, 17, dan 20 oC/menit. Hasil analisis TG-DTA menunjukkan bahwa reaksi dekomposisi prekursor asetat dan nitrat membentuk HAp masing-masing terjadi pada suhu 659 oC dan 560 oC. Hasil fitting parameter kinetika menunjukkan bahwa energi aktivasi pembentukan HAp pada prekursor asetat sebesar 161,56 kJ/mol  dengan model kinetika Normal Grain Growth sedangkan pada prekursor nitrat sebesar 374 kJ/mol dengan model kinetika Johnson-Mehl-Avrami. Kata kunci: Biomaterial, hidroxypapatite, Dekomposisi, Energi Aktivasi ABSTRACT KINETIC STUDY OF THE BIOMATERIAS HIDOXYAPATITE SINTHESIS WITH PRECURSOR NITRATE AND  ACETATE. Hidroxyapatite (HAp) is one of the biomaterials widely applied in the medical world to make implant tissues of the body, especially bones and teeth so that the purity of the HAp plays a fairly important. In order to obtain high purity HAp, reaction kinetics should be known clearly. TG-DTA  is method used to obtain the reaction kinetics of HAp.TG-DTA analyzes were conducted on precursors acetate and nitrate. TG-DTA method is carried out by heating HAp precursor with variation heating rate 10, 15, 17, and 20° C/min respectively. The results of TG-DTA  showed decomposition precursor acetate and nitrate formed HAp occurs on temperature 659° C and 560° C respectively. The results of the fitting kinetic showed activation energy of  the HAp formation on acetate precursors about 161.56 kJ/mol with Normal Grain Growth kinetic model whereas the nitrate precursor about 374 kJ/mol with Johnson-Mehl-Avrami  kinetic model.

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>

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