Abstract
The present study deals with fingerprinting the oxidation behavior of a Brazilian crude (12° API) oil. It focuses on the determination of reaction kinetic parameters through classical thermal analysis techniques such as thermogravimetry (TG), differential thermal analysis (DTG) and scanning calorimetry (DSC). The required experimental data are collected from oil and oil–sand samples. The reaction data are treated following distinct conventional and isoconversional non-isothermal models, using integral and differential approaches based on Arrhenius’ model. The thermoanalytical study is successful in identifying three oxidation temperature ranges: the low-temperature (LTO) range, a transition zone, and the high-temperature (HTO) range. TG and DSC analyses show that the highest variation of mass and the highest level of energy generation occur at the HTO range. At the high end of the LTO range, a mass transfer resistance (skin effect) was evident. Values of activation energy obtained for oil samples are 103 kJ mol−1 for LTO and 278 kJ mol−1 for HTO oxidation reactions by the most straightforward method used—the unity model. By all kinetic models, HTO’s values are higher than those for LTO, observation also valid for the results of oil–sand samples. Results also evidence that the presence of sand contributes to the so-called skin effect.
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Abbreviations
- A :
-
Pre-exponential factor, 1/s
- ARC:
-
Accelerating rate calorimetry
- ASTM:
-
American Society for Testing and Materials
- BSW:
-
Basic sediment and water
- C,H,N:
-
Carbon, hydrogen and nitrogen
- C 20+ :
-
Icosane plus fraction
- DTA:
-
Differential thermal analysis
- DSC:
-
Scanning calorimetry
- DTG:
-
Differential thermal analysis
- E :
-
Activation energy, kJ mol−1
- E α :
-
Apparent activation energy or activation energy in some conversion, kJ mol−1
- FD:
-
Fuel deposition
- f(α):
-
Differential conversion function, dimensionless
- g(α):
-
Integral conversional function, dimensionless
- H :
-
Enthalpy, J
- HTO:
-
High-temperature oxidation
- ISC:
-
In Situ Combustion
- LTO:
-
Low-temperature oxidation
- m :
-
Actual mass, mg
- m i :
-
Initial mass, mg
- m f :
-
Final mass, mg
- n :
-
Reaction order, dimensionless
- NTG:
-
Negative temperature gradient
- R :
-
Universal gas constant, J/(K-gmol)
- t :
-
Time, s
- T :
-
Absolute temperature, K
- T 0 :
-
Initial temperature, °C
- T m :
-
Peak temperature, °C
- T α :
-
Absolute temperature at given conversion, K
- TG:
-
Thermogravimetry
- x :
-
Remaining mass, mg
- ΔH :
-
Total reaction heat, J
- α:
-
Extent of reaction conversion, dimensionless
- β:
-
Heating rate, °C/min
- Δ:
-
Gradient
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The authors would like to acknowledge Petrobras-Cenpes and Finep-Ctpetro for the support given to this research.
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Techincal Editor: Demetrio Neto.
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Pereira, A.N., Trevisan, O.V. Thermoanalysis and reaction kinetics of heavy oil combustion. J Braz. Soc. Mech. Sci. Eng. 36, 393–401 (2014). https://doi.org/10.1007/s40430-013-0093-z
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DOI: https://doi.org/10.1007/s40430-013-0093-z