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Kinetics according to Flynn and Wall

This method is based on the evaluation of the curves of at least three TGA experiments at different heating rates. Fig. 4-196 shows the plot of the pyrolysis of bitumen B 80 at a heating rate = 10 K/min. There is only a small difference between the DTA and DTG maximum temperatures within the limits of the method. At peak maximum the conversion is still incomplete and amoimts to only 57 % whereas the total conversion is 80 %. [Pg.442]

Isothermal Percent Conversion versus Time Isoconversion Time versus Temperature Activation Energy versus % Conversion Table of Results [Pg.443]

STA-Diagram Raw Data Plot, Lines of Isoconversion Heating Rate fi 5, 10, 20K/min Atmosphere Argon 20 + 30 cm /min Kinetics according Flynn and Wall [Pg.444]

STA Arrhenius Plot In k versus 1 000/Kelvin Kinetics according Flynn and Wall [Pg.446]

STA Diagram Specific Rate Constant k versus Temperature Kinetics according Flynn and Wall [Pg.447]


Fig. 3-51 Reaction Kinetics according to Flynn and Wall [3-21, 3-22] Pyrolysis of CaC204 H2O Atmosphere Argon, 30 + 20 cm /min, 1 bar Heating Rates j3 5, 10, and 20 K/min... Fig. 3-51 Reaction Kinetics according to Flynn and Wall [3-21, 3-22] Pyrolysis of CaC204 H2O Atmosphere Argon, 30 + 20 cm /min, 1 bar Heating Rates j3 5, 10, and 20 K/min...
Table 4-211 Oxidation kinetics of bitumen B80 according to Flynn and Wall. Experiments with Simultaneous Thermal Analyzer... Table 4-211 Oxidation kinetics of bitumen B80 according to Flynn and Wall. Experiments with Simultaneous Thermal Analyzer...
The plot of Activation Energy versus Percent Conversion and the Table of Kinetic Results in the evaluation according to Flynn and Wall are useful. The Table of Results contains the numerical values of the activation energies and the frequency (preexponential) factors as function of the pre-selected conversion levels, which can be applied directly for kinetic calculations. [Pg.482]

The application of thermoanalytical methods to the investigation of the kinetics of pyrolysis and oxidation processes of heavy petroleum components representing multi-component systems proved to be successful. Whereas the ASTM E 698-79 and the Flynn and Wall methods can be applied relatively uncritically, the interpretation of the data from the McCarty and Green method requires a solid knowledge of the thermal and oxidative behavior of the samples. The attempt to use the evaluation according to Borchardt and Daniels proved not to be successful for pyrolysis nor for oxidation reactions. Most of the... [Pg.482]

For investigation of the kinetics of p)Tolysis and oxidation reactions a Simultaneous Thermal Analyzer is preferred, provided that the incorporated software permits the evaluation according both to ASTME 689-79 and Flynn and Wall. In this way the kinetic parameters can be obtained and at the same time the peak maxima (minima) of the curves of energy against temperature can be examined to decide whether they really appear at equal conversion levels independent of the heating rates. All the requirements for the thermoanalysis of petroleum and its products would be fulfilled if such an instrument could... [Pg.486]


See other pages where Kinetics according to Flynn and Wall is mentioned: [Pg.45]    [Pg.442]    [Pg.469]    [Pg.45]    [Pg.442]    [Pg.469]    [Pg.90]    [Pg.453]    [Pg.478]    [Pg.479]    [Pg.480]    [Pg.479]    [Pg.145]    [Pg.465]    [Pg.268]    [Pg.555]   


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Accord

Flynn

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