NDLI: Kinetic modeling of deoiled asphaltene particle pyrolysis in thermogravimetric analysis

Content Provider	Springer Nature Link
Author	Cheng, Yan Yan, Binhang Li, Tianyang Cheng, Yi
Copyright Year	2016
Abstract	The pyrolysis behavior of deoiled asphaltene particles was experimentally studied by thermogravimetric analysis. Considering that the activation energy would change with the evolution of pyrolysis reactions, a modified competition model was proposed to appropriately describe the pyrolysis kinetics. The model parameters were fitted with experimental results. Compared with the original two-stage model, the modified competition model showed the capability of predicting the asphaltene pyrolysis at various heating conditions using fixed kinetic parameters. The results exhibited that the modified competition model can well simulate the asphaltene pyrolysis in the main mass loss temperature range from 500 to 900 K as well as the slow decomposition at the temperatures greater than 900 K during the devolatilization process of asphaltene particles at hundred micrometer size. The modified competition model was further coupled with a heat transfer model at particle scale, including the heat exchange between the particle and the surrounding atmosphere as well as the heat transfer inside the particle. It is found that during the thermogravimetric analysis, the particle surface temperature was close to that of atmosphere, and the heat transfer effect inside the particle could be ignored for hundred-micron-sized particles. However, the temperature gradient inside particles should be considered for millimeter-sized particles. Thus, the particle samples should be sieved to hundred micron sized or smaller when studying the basic pyrolysis behaviors in order to acquire kinetic parameters for asphaltene pyrolysis by thermogravimetric analysis.
Starting Page	1661
Ending Page	1670
Page Count	10
File Format	PDF
ISSN	13886150
Journal	Journal of thermal analysis
Volume Number	124
Issue Number	3
e-ISSN	15882926
Language	English
Publisher	Springer Netherlands
Publisher Date	2016-01-30
Publisher Place	Dordrecht
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Asphaltene Pyrolysis kinetics Thermogravimetric analysis Single-particle modeling Physical Chemistry Analytical Chemistry Polymer Sciences Inorganic Chemistry Measurement Science and Instrumentation
Content Type	Text
Resource Type	Article
Subject	Physical and Theoretical Chemistry Condensed Matter Physics

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