scholarly journals MODELING OF PYROLYSIS OF OIL RESIDUES IN THE PRESENCE OF ALUMINOSILICATES

2020 ◽  
pp. 27-36
Author(s):  
Кирилл Вячеславович Чалов ◽  
Юрий Владимирович Луговой ◽  
Юрий Юрьевич Косивцов
Keyword(s):  
Kinetic Parameters ◽  
Catalytic Pyrolysis ◽  
Bentonite Clay ◽  
Destruction Process ◽  
Heating Rates ◽  
Second Stage ◽  
Sample Heating ◽  
Formal Kinetic ◽  
Kinetics Of ◽  
Calculated Model

Данная работа посвящена изучению кинетики процесса каталитического пиролиза кубовых остатков нефти. Исследование проводилось методом термогравиметрии с различной скоростью нагрева образца (2,5; 5 и 10 К/мин). В качестве катализаторы была использована синтезированная каталитическая система: ZSM-5/бентонитовая глина с импрегнированным металлом (Со - 2 % масс.). При моделировании были определены формальные кинетические параметры Аррениуса процесса деструкции. Рассчитанная модель представляет собой двухстадийный параллельный процесс. Значения энергий активации деструкции для первой стадии составило 58 кДж/моль и 188 кДж/моль для второй. This work is devoted to the study of the kinetics of the process of catalytic pyrolysis of oil residues. The study was performed by thermogravimetry with different sample heating rates (2.5, 5, and 10 K / min). A synthesized catalytic system was used as a catalyst: ZSM-5 / bentonite clay with impregnated metal (Co-2% wt.). Formal kinetic parameters of the Arrhenius of the destruction process were determined During modeling. The calculated model is a two-stage parallel process. The destruction activation energies for the first stage were 58 kJ/mol and 188 kJ/mol for the second stage.

scholarly journals Decomposition Characteristics and Kinetics of Microalgae in N2 and CO2 Atmospheres by a Thermogravimetry

2017 ◽  
Vol 2017 ◽  
pp. 1-7 ◽  
Author(s):  
Xu Qing ◽  
Ma Xiaoqian ◽  
Yu Zhaosheng ◽  
Cai Zilin ◽  
Ling Changming
Keyword(s):  
Activation Energy ◽  
Thermogravimetric Analysis ◽  
Thermal Degradation ◽  
Apparent Activation Energy ◽  
Kinetic Parameters ◽  
Reaction Order ◽  
Heating Rates ◽  
Residual Mass ◽  
Second Stage ◽  
Kinetics Of

The thermal degradation characteristics of microalgae were investigated in highly purified N2 and CO2 atmospheres by a thermogravimetric analysis (TGA) under different heating rates (10, 20, and 40°C/min). The results indicated that the total residual mass in CO2 atmosphere (16.86%) was less than in N2 atmosphere (23.12%); in addition, the kinetics of microalgae in N2 and CO2 atmospheres could be described by the pseudo bicomponent separated state model (PBSM) and pseudo-multi-component overall model (PMOM), respectively. The kinetic parameters calculated by Coats-Redfern method showed that, in CO2 atmosphere, the apparent activation energy (E) of microalgae was between 9.863 and 309.381 kJ mol−1 and the reaction order (n) was varied from 1.1 to 7. The kinetic parameters (E,n) of the second stage in CO2 atmosphere were quite similar to those in N2 atmosphere.

Thermal degradation kinetics of oxo-degradable PP/PLA blends

2018 ◽  
Vol 39 (1) ◽  
pp. 58-67 ◽  
Author(s):  
Dev K. Mandal ◽  
Haripada Bhunia ◽  
Pramod K. Bajpai
Keyword(s):  
Activation Energy ◽  
Thermal Stability ◽  
Thermogravimetric Analysis ◽  
Thermal Degradation ◽  
Kinetic Parameters ◽  
Degradation Kinetics ◽  
Nitrogen Atmosphere ◽  
Thermal Degradation Kinetics ◽  
Heating Rates ◽  
Kinetics Of

AbstractIn this article, the influence of polylactide and pro-oxidant on the thermal stability, degradation kinetics, and lifetime of polypropylene has been investigated using thermogravimetric analysis under nitrogen atmosphere at four different heating rates (i.e. 5, 10, 15, and 20°C/min). The kinetic parameters of degradation were studied over a temperature range of 30–550°C. The derivative thermogravimetric curves have indicated single stage and two stage degradation processes. The activation energy was evaluated by using the Kissinger, Kim-Park, and Flynn-Wall methods under the nitrogen atmosphere. The activation energy value of polypropylene was much higher than that of polylactide. Addition of polylactide and pro-oxidant in polypropylene decreased the activation energy. The lifetime of polypropylene has also decreased with the addition of polylactide and pro-oxidant.

Kinetics of BaBr2 · 2 H2O Dehydration: Comparison between Isothermal and Non-isothermal Methods

1979 ◽  
Vol 34 (4) ◽  
pp. 437-440 ◽  
Author(s):  
Giorgio Flor ◽  
Amedeo Marini ◽  
Vittorio Berbenni
Keyword(s):  
Kinetic Parameters ◽  
Dynamic Measurements ◽  
Heating Rates ◽  
Mathematical Methods ◽  
Isothermal Tg ◽  
Thermal Lag ◽  
Dehydration Processes ◽  
Kinetics Of ◽  
Good Agreement

For the dehydration processesBaBr2 • 2 H2O → BaBr2 • H2O + H2O (I)BaBr2 • H2O → BaBr2 + H2O (II)a comparison was made between the experimental non-isothermal ɑ vs. t curves and those calculated on the basis of a previous isothermal study.It was observed that for low heating rates, when the "thermal lag" is negligible, the dynamic measurements are in good agreement with the isothermal ones.Furthermore, for process (I), two mathematical methods proposed for the interpretation of the non-isothermal TG curves were applied and the kinetic parameters so obtained were discussed

scholarly journals Pyrolysis of waste tyres – The effect of reaction kinetics on the results of thermogravimetric analysis

2017 ◽  
Vol 38 (3) ◽  
pp. 363-377 ◽  
Author(s):  
Robert Cherbański ◽  
Krzysztof Wróblewski ◽  
Eugeniusz Molga
Keyword(s):  
Kinetic Parameters ◽  
Scale Up ◽  
Internal Heat ◽  
Heating Rates ◽  
Transfer Resistance ◽  
First Derivative ◽  
Experimental Part ◽  
Waste Tyres ◽  
Kinetics Of ◽  
Internal Heat Transfer

Abstract This paper presents a systematic thermogravimetric (TG) study on the kinetics of end-of-life tyre (ELT) pyrolysis. In the experimental part of this work, TG results are compared for tyre samples of different mass and size. This shows that the conduction resistance in the milligram scale (up to ~100 mg) tyre sample can be neglected. A comparison of experimental results demonstrates that the characteristic maxima on the DTG curve (the first derivative of TG signal) shift towards higher temperatures for higher heating rates. This phenomenon is explained to have kinetic origin and it is not caused by the internal heat transfer resistance. In the modelling part of this work, the kinetic parameters of the Three-Component Simulation Model (TCSM) are calculated and compared to the literature values. Testing of the kinetic model is carried out using experiments with a varying heating rate. This shows the limitation of the simplified kinetic approach and the appropriate selection method of the kinetic parameters.

Reaction Kinetics of Paddy Husk Thermal Decomposition

1999 ◽  
Vol 121 (1) ◽  
pp. 25-30 ◽  
Author(s):  
A. K. Jain ◽  
S. K. Sharma ◽  
D. Singh
Keyword(s):  
Thermal Decomposition ◽  
Chemical Analysis ◽  
Thermal Degradation ◽  
Kinetic Parameters ◽  
Elemental Analysis ◽  
Proximate Analysis ◽  
Heating Rates ◽  
Modified Model ◽  
Renewable Source ◽  
Kinetics Of

The physical characteristics, proximate analysis, elemental analysis and chemical analysis of paddy husk, an important renewable source of energy, are reported in this paper. The kinetic parameters for the thermal degradation of paddy husk at heating rates of 10 and 100°C min−1 and under atmospheres of air and oxygennitrogen mixture (5:95) have been evaluated from experimentally obtained TGA data. The limitations of the existing TGA models are discussed, and a modified model has been used for correlation of the data.

Kinetics of the Calcium Oxysulfides Reduction by Carbon Monoxide

2009 ◽  
Vol 283-286 ◽  
pp. 539-544 ◽  
Author(s):  
R.I. Gulyaeva ◽  
Evgeny N. Selivanov ◽  
A.N. Mansurova
Keyword(s):  
Experimental Data ◽  
Carbon Monoxide ◽  
Thermogravimetric Analysis ◽  
Kinetic Parameters ◽  
X Ray Diffraction ◽  
Heating Rates ◽  
X Ray ◽  
Reduction Processes ◽  
Heating Up ◽  
Kinetics Of

The chemistry and the kinetics of the reduction of calcium containing CaFeSO and Ca2FeCuSO3) oxysulfides in a mixture of flowing gases that contains (75% CO) carbon monoxide and argon have been investigated by thermogravimetric analysis and X-ray diffraction. Experiments were carried out on the synthesized samples by heating up to 1270 K with heating rates of 5-20 K/min. The Netzsch Thermokinetics program was used for the analysis of the experimental data. Kinetic parameters of reduction processes are determined.

Influence of medium on alkaline hydrolysis of succinic acid monomethyl and monopropyl esters

1980 ◽  
Vol 45 (11) ◽  
pp. 2873-2882
Author(s):  
Vladislav Holba ◽  
Ján Benko
Keyword(s):  
Succinic Acid ◽  
Kinetic Parameters ◽  
Alkaline Hydrolysis ◽  
Specific Interactions ◽  
Nonaqueous Media ◽  
The Media ◽  
Kinetics Of ◽  
Hydrolysis Of

The kinetics of alkaline hydrolysis of succinic acid monomethyl and monopropyl esters were studied in mixed aqueous-nonaqueous media at various temperatures and ionic strengths. The results of measurements are discussed in terms of electrostatic and specific interactions between the reactants and other components of the reaction mixture. The kinetic parameters in the media under study are related to the influence of the cosolvent on the solvation sphere of the reactants.

Kinetics of temperature-programmed reactivation of a hydrodesulphurization catalyst

1983 ◽  
Vol 48 (12) ◽  
pp. 3340-3355 ◽  
Author(s):  
Pavel Fott ◽  
Pavel Šebesta
Keyword(s):  
Carbon Dioxide ◽  
Thermal Analysis ◽  
Differential Thermal Analysis ◽  
Thin Layer ◽  
Kinetic Parameters ◽  
Diffusion Region ◽  
Reaction Heat ◽  
Gaseous Products ◽  
Temperature Programmed ◽  
Kinetics Of

The kinetic parameters of reactivation of a carbonized hydrodesulphurization (HDS) catalyst by air were evaluated from combined thermogravimetric (TG) and differential thermal analysis (DTA) data. In addition, the gaseous products leaving a temperature-programmed reactor with a thin layer of catalyst were analyzed chromatographically. Two exothermic processes were found to take part in the reactivation, and their kinetics were described by 1st order equations. In the first process (180-400 °C), sulphur in Co and Mo sulphides is oxidized to sulphur dioxide; in the second process (300-540 °C), in which the essential portion of heat is produced, the deposited carbon is oxidized to give predominantly carbon dioxide. If the reaction heat is not removed efficiently enough, ignition of the catalyst takes place, which is associated with a transition to the diffusion region. The application of the obtained kinetic parameters to modelling a temperature-programmed reactivation is illustrated on the case of a single particle.

scholarly journals Thermal Stability and Decomposition Kinetics of 1-Alkyl-2,3-Dimethylimidazolium Nitrate Ionic Liquids: TGA and DFT Study

Materials ◽  
2021 ◽  
Vol 14 (10) ◽  
pp. 2560
Author(s):  
Jianwen Meng ◽  
Yong Pan ◽  
Fan Yang ◽  
Yanjun Wang ◽  
Zhongyu Zheng ◽  
...  
Keyword(s):  
Thermal Stability ◽  
Density Functional Theory ◽  
Ionic Liquids ◽  
Density Functional ◽  
Density Functional Theory Calculations ◽  
Nitrogen Atmosphere ◽  
Decomposition Kinetics ◽  
Heating Rates ◽  
Functional Theory ◽  
Kinetics Of

The thermal stability and decomposition kinetics analysis of 1-alkyl-2,3-dimethylimidazole nitrate ionic liquids with different alkyl chains (ethyl, butyl, hexyl, octyl and decyl) were investigated by using isothermal and nonisothermal thermogravimetric analysis combined with thermoanalytical kinetics calculations (Kissinger, Friedman and Flynn-Wall-Ozawa) and density functional theory (DFT) calculations. Isothermal experiments were performed in a nitrogen atmosphere at 240, 250, 260 and 270 °C. In addition, the nonisothermal experiments were carried out in nitrogen and air atmospheres from 30 to 600 °C with heating rates of 5, 10, 15, 20 and 25 °C/min. The results of two heating modes, three activation energy calculations and density functional theory calculations consistently showed that the thermal stability of 1-alkyl-2,3-dimethylimidazolium nitrate ionic liquids decreases with the increasing length of the alkyl chain of the substituent on the cation, and then the thermal hazard increases. This study could provide some guidance for the safety design and use of imidazolium nitrate ionic liquids for engineering.

scholarly journals Pyrolysis and Oxidation of PAN in Dry Air. Thermoanalytical Methods

1970 ◽  
Vol 17 (1) ◽  
pp. 38-42
Author(s):  
Anna BIEDUNKIEWICZ ◽  
Pawel FIGIEL ◽  
Marta SABARA
Keyword(s):  
Temperature Increase ◽  
Heating Rates ◽  
Linear Change ◽  
Dry Air ◽  
Isothermal Conditions ◽  
Gaseous Products ◽  
Heterogeneous Processes ◽  
Temperature Ranges ◽  
Higher Temperature ◽  
Kinetics Of

The results of investigations on pyrolysis and oxidation of pure polyacrylonitrile (PAN) and its mixture with N,N-dimethylformamide (DMF) under non-isothermal conditions at linear change of samples temperature in time are presented. In each case process proceeded in different way. During pyrolysis of pure PAN the material containing mainly the product after PAN cyclization was obtained, while pyrolysis of PAN+DMF mixture gave the product after cyclization and stabilization. Under conditions of measurements, in both temperature ranges, series of gaseous products were formed.For the PAN-DMF system measurements at different samples heating rates were performed. The obtained results were in accordance with the kinetics of heterogeneous processes theory. The process rates in stages increased along with the temperature increase, and TG, DTG and HF function curves were shifted into higher temperature range. This means that the process of pyrolysis and oxidation of PAN in dry air can be carried out in a controlled way.http://dx.doi.org/10.5755/j01.ms.17.1.246

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