Kinetics of the Hydroremoval of Sulfur, Oxygen, and Nitrogen from a Low Temperature Coal Tar

Qader, S.A.; Wiser, W.H.; Hill, George R.

doi:10.1021/i260027a014

Cited by 24 publications

(12 citation statements)

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“…Other researchers have done studies on HDN using different kinetic models listed in Table 6 22,34,52–59 . It shows that when reaction order is 1, the range of activation energy is approximately 38–78 kJ·mol −1 , which is near to the K 1 model (35.45, 60.18, and 90.01 kJ·mol −1 ).…”

Section: Resultsmentioning

confidence: 86%

Lumped kinetic simulation of hydrodenitrogenation for full‐range middle‐low temperature coal tar

Dan

et al. 2021

Int J of Chemical Kinetics

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With the increasingly prominent environmental problems and depletion of light petrochemical resources, the clean utilization of heavy oil has become the research focal area. The hydrodenitrogenation (HDN) experiments and kinetics of full‐range middle‐low temperature coal tar (MLCT) was studied on a fixed‐bed reactor with a Ni‐Mo/γ‐Al2O3 catalyst. Two kinds of three‐lumped kinetic models (K1 and K1.24) based on different reaction orders and high‐middle‐low reactivities were established and fitted by a simulated annealing algorithm for coal tar HDN reactions. The results presented good correspondence with experimental data following an average relative error of less than 0.3%. The effect of temperature, pressure, and liquid hourly space velocity (LHSV) on HDN of different reactivity nitrogen compounds (NCs) of MLCT was studied using the lumped kinetic models. Also, the difference between K1 and K1.24 models on the embodiment ability for HDN laws was also discussed from multiple perspectives. It has been observed that the HDN reactions of low and middle reactivity NCs are more influenced by LHSV; high temperature and pressure are more critical for the removal of low reactivity NCs, and low‐temperature or ‐pressure zone have larger effects on coal tar HDN reactions, especially at high LHSV; temperature has much more influence than pressure on the HDN effect, particularly towards the low reactivity NCs. The results of HDN laws for high reactivity NCs are concordant with K1 and K1.24 models. The K1.24 model is a bit more reasonable to reveal the HDN law of middle to low reactivity NCs.

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Section: Resultsmentioning

confidence: 86%

Lumped kinetic simulation of hydrodenitrogenation for full‐range middle‐low temperature coal tar

Dan

et al. 2021

Int J of Chemical Kinetics

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“…The desulfurization of naphtha (Wilson et al, 1957), petroleum feeds (Schuit and Gates, 1973), coal tar (Qader et al, 1968) and petroleum coke (El-Haddah and Ezz, 1973) have all been shown to be first order. It was reasonable to assume that the total desulfurization of coal could, likewise, be modeled as first order.…”

Section: Resultsmentioning

confidence: 99%

“…Limited data are available in the literature to compare the activation energy found in this study with those found by others. Qader et al (1968) obtained an activation energy of 11.0 kcal/mol for the desulfurization of coal tars, which is primarily organic desulfurization. Pitts et al (1976) obtained values of 18.00 and 40.78 kcal/mol for two organic sulfur forms in catalytic desulfurization.…”

Section: Resultsmentioning

confidence: 99%

Kinetics of Sulfur Form Removal during Coal Hydrogenation

Gertenbach¹,

Baldwin²,

Bain³

et al. 1979

Ind. Eng. Chem. Proc. Des. Dev.

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Wb, fixed carbon weight fraction in original char x¡, mole fraction of the tth gaseous component X, carbon conversion = (carbon in original charcarbon left _ in char)/(carbon in original char) X, average carbon conversion on a mass basis Zj, total rate for the ;'th reaction (i < 3); for d > 3 it is the rate of the j -3 reaction, kmol/s m2 Greek Letters «i, defined in eq 22 ß, defined eq 25b 6¿y, Kronecker AM rate of mass consumption in the reactor, kg/s m2 eb, bubble volume fraction

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“…For larger molecules such as dibenzothiophene, dibcnzofuran, and carbazol types, the ring is opened through the C-X bond scission either directly (Houalla et al, 1977) or after the latter is weakened by saturation of the attached aromatic ring (Qader et al, 1968). The relative rates of ring opening then would increase from 0 through N to S containing heterorings (Cottrell, 1958).…”

Section: Thermochemical and Mechanistic Consideratio~nsmentioning

confidence: 99%

Catalytic removal of sulfur, nitrogen, and oxygen from heavy gas oil

Furimsky

1979

AIChE Journal

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Removal of sulfur, nitrogen, and oxygen from heavy gas oils is affected by the chemical composition of supported molybdate catalysts. Cobalt and nickel, when added to these catalysts, have a promoting effect on these reactions. However, the relative rates always follow the same trend; that is, the hydrodesulfurization is the fastest, followed by hydrodenitrogenation and hydrodeoxygenation. CONCLUSIONS AND SIGNIFICANCERelative rates of S, N, and 0 removal from a heavy gas ing species which may be products of reactions between oil are in qualitative agreement with the C-S, C-N, and air and the feed are not included. These observations are C-0 bond strengths; thus, the rate of hydrodesulfurization supported by a number of mechanistic surface phenomena (HDS) is highest, followed by hydrodenitrogenation and other thermochemical considerations. (HDN) and hydrodeoxygenation (HDO). The comparison isThe presence of carbonaceous deposits on the catalyst based on heterocyclic compounds; that is, the 0 contain-surface had little effect on these trends. N and 0 accumulate in the deposits because N and 0 containing ical Engineers, 1979.heterocyclic compounds resist the catalytic reactions. De-

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Kinetics of the Hydroremoval of Sulfur, Oxygen, and Nitrogen from a Low Temperature Coal Tar

Cited by 24 publications

References 0 publications

Lumped kinetic simulation of hydrodenitrogenation for full‐range middle‐low temperature coal tar

Lumped kinetic simulation of hydrodenitrogenation for full‐range middle‐low temperature coal tar

Kinetics of Sulfur Form Removal during Coal Hydrogenation

Catalytic removal of sulfur, nitrogen, and oxygen from heavy gas oil

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