Pyrolysis of asphaltenes in an atmospheric entrained flow reactor: A study on char characterization

Mahapatra, Nirlipt; Kurian, Vinoj; Wang, Ben; Martens, Frans; Gupta, Rajender

doi:10.1016/j.fuel.2015.02.086

Cited by 20 publications

(14 citation statements)

References 44 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The pyrolysis and gasification experiments were carried out in an atmospheric entrained-flow reactor. The experimental setup used for this study is explained in previous papers, , and a schematic diagram is shown in Figure . The reactor furnace consists of an electrically heated vertical core of mullite tube (2.5 in.…”

Section: Methodsmentioning

confidence: 99%

Distribution of Vanadium, Nickel, and Other Trace Metals in Soot and Char from Asphaltene Pyrolysis and Gasification

Kurian

Gupta

2016

Energy Fuels

View full text Add to dashboard Cite

Vanadium (V) and nickel (Ni) are the most abundant and troublesome metals present in oil sands. During upgrading of the oil sand bitumen, these metals become concentrated in the heavier fraction asphaltenes. Any thermochemical conversion of asphaltene causes the release of these trace metals, and their distribution in the products poses concerns with toxicity, corrosion, and fouling. The pyrolysis, partial oxidation, and steam gasification experiments of asphaltene were carried out in an electrically heated atmospheric entrained-flow reactor, and the products char and soot are analyzed for the trace metal content. It is observed that the main metals present in the char and soot are V and Ni. During pyrolysis, with an increase in the temperature, the quantity of V and Ni present in char decreases as a result of the increased liberation into the gas phase. However, more liberated V and Ni were not captured by soot formed in the same experiment. During partial oxidation of asphaltenes, an increase in the stoichiometric oxygen content decreases the soot yield. The V and Ni contents in both the char and soot decrease with an increase in the stoichiometric oxygen ratio. The V content increases with the increase in the steam/fuel ratio in both char and soot obtained from steam gasification. With the increase in the steam/fuel ratio, the Ni content slightly decreases in char but increases to more than double in soot. Understanding the interaction of inorganic matter with char and soot will help in solving post-gasification fouling and erosion problems.

show abstract

Section: Methodsmentioning

confidence: 99%

Distribution of Vanadium, Nickel, and Other Trace Metals in Soot and Char from Asphaltene Pyrolysis and Gasification

Kurian

Gupta

2016

Energy Fuels

View full text Add to dashboard Cite

show abstract

“…Most of the works reported in the literature focused on the structure of the aromatic core ,, rather than the nature and quantification of other functional groups related to the main heteroatoms: N, S, and O. , When detailed structural information is not present, the elemental analysis is used to discriminate among asphaltenes from different sources and separated with different techniques. From literature research, 208 elemental compositions of different asphaltenes were collected to create a reasonably wide database in order to define an operative range, which includes the highest variety of different species. ,− The complete list can be found in the Supporting Information. The parameter adopted for the characterization is the ratio between the mass fraction of each element over the mass fraction of carbon.…”

Section: Kinetic Modelmentioning

confidence: 99%

“…In the second part of the work, the structure of five pseudocomponents was designed based on the experimental data obtained and literature research. Moreover, a data set of elemental compositions of 208 ,− asphaltenes was collected. The elemental compositions of the five pseudocomponents were chosen in order to make the reproduction of the composition of each species reported in the data set as their linear combination possible.…”

Section: Introductionmentioning

confidence: 99%

Chemical Kinetics of Asphaltene Pyrolysis

et al. 2021

View full text Add to dashboard Cite

This work presents a predictive and generally applicable approach to asphaltene pyrolysis modeling. Asphaltenes derived from heavy fuel oil 380 (HFO) were characterized using elemental analysis and FT-ICR MS. The structural information derived from the chemical analysis guided the formulation of five surrogate molecules. The atomic ratios of the surrogate molecules were defined to replicate the elemental composition of each data as their linear combination. This approach makes the model flexible and readily applicable to any asphaltene fraction by only knowing its elemental composition. The formulation of the kinetic model proceeded through chemistry-related considerations on the reactions most likely to take place at a given temperature for each component. The authors also used the experimental data obtained from thermogravimetric analysis (TGA) in an inert atmosphere, either reported in the literature or generated by the authors for the development of the kinetic scheme. The kinetic scheme consists of five first-order reactions. The activation energy (E a) and Arrhenius (A) coefficient were tuned using a subset of the experimental data available and validated with the remaining data. The product distribution of the in-house-produced samples was obtained from a TGA–MS and TGA–FTIR analysis and used to adjust the stoichiometric coefficients together with experimental data reported in the literature. The model presented a satisfactory agreement with the most recent experimental data while showing some discrepancies with older data, which are discussed in the paper. The model reported in this work represents the first step of a more comprehensive project aimed to reconstruct the chemical kinetics of HFOs as a combination of their saturate, aromatic, resin, and asphaltene fractions.

show abstract

“…Petcoke ash was mainly composed of V and Ni, and the spinel formed by vanadium could increase the ash viscosity. Mahapatra et al [13] measured the release of vanadium and nickel during the pyrolysis process, reporting that vanadium and nickel tended to accumulate in the coke compared to fly ash. Wang et al [7] investigated that the formation of ash and slag was closely related to the conversion of vanadium, nickel, and sulfur during the gasification process.…”

Section: Introductionmentioning

confidence: 99%

Migration and Transformation of Vanadium and Nickel in High Sulfur Petroleum Coke during Gasification Processes

Wang

Nie

et al. 2018

Energies

View full text Add to dashboard Cite

The volatilization characteristics and occurrence forms of V and Ni in petroleum coke (petcoke) were investigated during steam (H2O) and carbon dioxide (CO2) gasification on a fixed bed reactor at 800–1100 °C. The Tessier sequential chemical extraction procedure was employed to determine the different forms of V and Ni. The results showed their volatilities were not dependent on the gasification atmosphere, but rather relied mainly on the reaction temperature. The CO2 atmosphere accelerated the conversion of organic-bound nickel to residual form at low temperature and promoted Fe-Mn oxides formation at high temperature. However, the H2O atmosphere was conducive to form vanadium bound to Fe-Mn oxides and promoted the decomposition of residual forms. In addition, the thermodynamic equilibrium calculations showed the volatilization of Ni mainly released Ni3S2 between 800–1100 °C. The H2O atmosphere was favorable to generate the more stable NixSy compound, thereby suppressing the volatilization of Ni, while the presence of CO2 led to an increase in residual V and decrease of Fe-Mn oxides. The V and Ni mainly caused erosion problems under the CO2 atmosphere while the fouling and slagging obviously increased under the H2O atmosphere with impacts gradually weakened with the increase of temperature.

show abstract

Pyrolysis of asphaltenes in an atmospheric entrained flow reactor: A study on char characterization

Cited by 20 publications

References 44 publications

Distribution of Vanadium, Nickel, and Other Trace Metals in Soot and Char from Asphaltene Pyrolysis and Gasification

Distribution of Vanadium, Nickel, and Other Trace Metals in Soot and Char from Asphaltene Pyrolysis and Gasification

Chemical Kinetics of Asphaltene Pyrolysis

Migration and Transformation of Vanadium and Nickel in High Sulfur Petroleum Coke during Gasification Processes

Contact Info

Product

Resources

About