McCarty and Green

The methods according to ASTM E 689-79, and to Borchardt and Daniels apply data from DSC or DTA test runs, whereas the methods according to Flynn and Wall, and to McCarty and Green are based upon the use of data fi om thermogravimetty. For the... 

The McCarty and Green method [3-24, 3-25] only requires a single thermogram (TGA curve). The thermogravimetric analysis curve is assumed to be a continuous function such that, to each point on the curve there corresponds a temperature T and a level of conversion C ... 

The McCarty and Green method is of economical interest because only one test run is required for the calculation of reaction kinetics. 

Fig. 3-65 Reaction Kinetics according to McCarty and Green [3-24] Pyrolysis of CaCjO HjO Heating Rate ]3 10 K/min...

Fig. 3-66 Kinetic of Vaporization of /i-Alkanes according to McCarty and Green Atmosphere Argon, 30 + 20 cmVmin, 1 bar Heating Rate p 10 K/min X Integration Limits On.sct Point to Offset Point o Integration Limits 100 % Weight to Onset Point...

Borchardt and Daniels Flynn and Wall McCarty and Green Version C 4.20... 

Fig. 4-206 Pyrolysis of Bitumen B80 STA Diagram TGA Heating Rate 10 K/min Atmosphere Argon 30 + 20 cm /min Kinetics according McCarty and Green Integration Limits 250 °C and 520 °C...

Table 4-206 Pyrolysis kinetics of bitumen B80 according to McCarty and Green. Experiments with Simultaneous Thermal Analyzer...

Table 4-207 Pyrolysis kinetics according to McCarty and Green.

The Raw Data Plot of the ASTM E 698-79 method shows whether the correct maximum temperatures have been obtained by selection of the limits. For the Flynn and Wall method there is a control whether the desired points of inflexion of the TGA curves are marked correctly. In the McCarty and Green program a Raw Data plot has no significance. 

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... 

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