Analytical pyrolysis of jet fuel using different free radical initiators to produce low molecular weight hydrocarbons

Priyadarshi, Satya; Kishore, M. Satya; Vinu, R.

doi:10.1016/j.jaap.2021.105430

Cited by 15 publications

(4 citation statements)

References 34 publications

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“…Three representative initiators with bond dissociation energies (BDEs) of the bonds susceptible to cracking. The BDE values (in kJ/mol) were referenced from Luo, Bach and Schelegel, and Priyadarshi et al …”

Section: Methodology Of Initiated Cracking Simulationmentioning

confidence: 99%

Low-Temperature-Initiated Cracking of Hydrocarbons to Produce Olefins: Simulation and Comparison of Different Initiators

Ren,

Mao,

Shen

et al. 2024

Ind. Eng. Chem. Res.

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Low-temperature-initiated cracking technology has significant potential to develop new hydrocarbon pyrolysis with better atomic economy and higher yields of light olefins. The impacts of three representative initiators, triethylamine (TEA), nitromethane (NM), and di-tert-butyl peroxide (DTBP), were compared. Sufficiently detailed co-cracking reaction networks of three initiators with n-hexane were obtained through an automatic reaction network generator RMG, and the corresponding steam cracking tubular reactor simulation was performed. The results showed that the initiator with a lower cracking temperature brought about a more noticeable decrease in the cracking temperature of n-hexane. Both TEA and NM increased the carbon atom conversion from n-hexane to ethylene and propylene, especially propylene. NM was more significant, while DTBP was almost ineffective. Through kinetic parameter analysis, it was found that the temperature dependence of the key reaction caused different initiator performance. NM completely cracked at an appropriate temperature where the rate constants of the hydrogen abstraction and ethylene generation had reached a high level, and the released free radicals were effective. Visual reaction network analysis revealed that NM had a strong ability to release free radicals, and these free radicals significantly adjusted the competitive reaction path to produce ethylene and propylene, resulting in the most obvious effect on improving the conversion of n-hexane and the yield of propylene. The action laws of NM described above under hydrocarbon pyrolysis conditions indicate that NM may be the most suitable initiator for low-temperature-initiated cracking of hydrocarbons among these three initiator types.

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Section: Methodology Of Initiated Cracking Simulationmentioning

confidence: 99%

Low-Temperature-Initiated Cracking of Hydrocarbons to Produce Olefins: Simulation and Comparison of Different Initiators

Ren,

Mao,

Shen

et al. 2024

Ind. Eng. Chem. Res.

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“…Analytical pyrolysis (Py-GC/MS) of the black liquor and hydrochars was conducted using a Curie point pyrolyzer (JHI-07, Japan Analytical Instruments) coupled with a GC/MS (Shimadzu QP 2020). The samples were tightly packed in pieces of ferromagnetic foil and then pyrolyzed at 740 °C for 50 s. The description of the Curie point Py-GC/MS and sample preparation protocol are available elsewhere 22,23 The decomposition profiles of the black liquor and hydrochars were obtained using a thermogravimetric analyzer (SDT Q600 TGA, T.A. Instruments) operating at a heating rate of 10 °C min −1 in the temperature range of 25–800 °C.…”

Section: Methodsmentioning

confidence: 99%

Platform chemicals from hardwood black liquor via hydrothermal liquefaction: influence of process conditions on product yields and quality

Harisankar

Vinu

2023

Sustainable Energy Fuels

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“…The electrical resistance of the alloy to the eddy currents results in the dissipation of energy in the form of heat, which results in rapid heating of the pyrofoil. The schematic of the Curie point pyrolyzer is available in Priyadarshi et al 41 In this study, two different pyrofoils corresponding to the Curie point temperatures of 500 and 650 °C were employed, as 500−650 °C is the typical temperature range for the inception of endothermic reactions in hydrocarbon fuels. The intimate contact between the pyrofoil and the sample ensures that the sample temperature corresponds to the Curie point temperature.…”

Section: Methodsmentioning

confidence: 99%

Catalytic Fast Pyrolysis of JP-10 and 3-Carene Using Analytical Py-GC/MS for the Production of Low Molecular Weight Hydrocarbons

Priyadarshi

Vinu

2022

Energy Fuels

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Endothermic hydrocarbon fuels (EHFs) are meant to regeneratively cool high-speed flight components and surfaces. In addition to physical heat absorption, they also undergo thermal decomposition thus offering a chemical heat sink. In this study, two single-molecule hydrocarbons, i.e., JP-10 (exotetrahydrodicyclopentadiene) and 3-carene (3,7,7-trimethylbicyclo[4.1.0]hept-3-ene), are tested for their applicability as EHF. Noncatalytic and catalytic pyrolysis tests were carried out in an analytical Curie point pyrolyzer coupled with gas chromatograph/mass spectrometer using zeolites (HY, Hβ, and Mordenite) at 500 and 650 °C. A quantitative analysis of the pyrolysate composition is performed to evaluate the effects of temperature, catalyst type and catalyst loading. The results demonstrated that the effect of temperature was minimal since the pyrolytic reactions were driven primarily by the protolysis of the reactants. The yields of low molecular weight (LMW) hydrocarbons were higher with HY and Hβ, whereas the extent of cracking was low over Mordenite. The highest LMW alkene and alkane yields of 11.9 and 5.8 wt %, respectively, were achieved with HY in the case of JP-10. Similarly, for 3-carene, LMW alkene and alkane yields were 15.2 and 11.4 wt %, respectively, in the presence of HY. Propylene, isobutylene and isopentane were the dominant pyrolysates from both the fuels with catalysts. Cycloalkanes and cycloalkenes were the major alicyclic hydrocarbons formed from JP-10 and 3-carene, respectively. The yields of alkanes, alkenes, cycloalkanes and benzene derivatives increased with catalyst loading for JP-10. In the case of 3-carene, a similar trend was followed except for cycloalkenes whose yield decreased with catalyst loading. Plausible reaction pathways for the formation of LMW hydrocarbons from both the fuels are proposed.

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Analytical pyrolysis of jet fuel using different free radical initiators to produce low molecular weight hydrocarbons

Cited by 15 publications

References 34 publications

Low-Temperature-Initiated Cracking of Hydrocarbons to Produce Olefins: Simulation and Comparison of Different Initiators

Low-Temperature-Initiated Cracking of Hydrocarbons to Produce Olefins: Simulation and Comparison of Different Initiators

Platform chemicals from hardwood black liquor via hydrothermal liquefaction: influence of process conditions on product yields and quality

Catalytic Fast Pyrolysis of JP-10 and 3-Carene Using Analytical Py-GC/MS for the Production of Low Molecular Weight Hydrocarbons

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