Kinetic parameter estimation and simulation of trickle-bed reactor for hydrodesulfurization of whole fraction low-temperature coal tar

Feng, Xiang; Li, Dong; Chen, Junghui; Niu, Menglong; Liu, Xu; Chan, Lester Lik Teck; Li, Wenhong

doi:10.1016/j.fuel.2018.05.023

Cited by 39 publications

(19 citation statements)

References 57 publications

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“…Medium–low temperature coal tar pitch (MLP) is a type of large‐scale by‐product obtained during the production of semi‐coke and deep‐processing of low‐rank coal, respectively . MLP is usually used as the raw material for the production of liquefied oil, road asphalt, mesophase pitch, and other artificial carbon materials . The researchers believe that with the deep understanding of the physico‐chemical properties of MLP, it is a significantly important precursor to produce fine mosaic coke .…”

Section: Introductionmentioning

confidence: 99%

Thermal Conversion Behavior of Medium–Low–Temperature Coal Tar Pitch During Liquid–Phase Carbonization Process

Zhu

Zhao

et al. 2019

ChemistrySelect

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Medium–low temperature coal tar pitch (MLP) is a type of aromatic carbonaceous material obtained by the low temperature distillation of low rank coal, and is considered as a desirable raw material for the production of artificial carbon/graphite material. The thermal conversion behaviors of MLP during the liquid‐phase carbonization process were analyzed in detail in this study. Further, the changes of molecular structure and carbon microcrystalline structure of MLP and liquid‐phase carbonization products derived from it were quantitatively investigated by optical microscopy, fourier transform infrared spectroscopy, Raman spectroscopy, X‐ray diffraction, and curve‐fitting method. Results showed that both branched chain and the contents of C=O functional groups in the MLP played a key role in the reaction reactivity. Moreover, temperature of 450 °C was found to be a rapid changing temperature point on the enhancement of thermal conversion of MLP. The stacking height (Lc), parallel layers (N), average number of aromatic rings in each layer (n), ratio of ‘impurity’ structure (RI), ratio of amorphous carbon structure (RAC), ratio of graphite carbon structure (RGC), and ratio of defects graphite carbon structure (RDGC) exhibited a significant change with the improvement of liquid‐phase carbonization temperature.

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Section: Introductionmentioning

confidence: 99%

Thermal Conversion Behavior of Medium–Low–Temperature Coal Tar Pitch During Liquid–Phase Carbonization Process

Zhu

Zhao

et al. 2019

ChemistrySelect

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“…The unique physicochemical properties of medium–low‐temperature coal tar pitch (MLP) make it an interesting material in many research fields 3 . It has been used as a feedstock for the production of added‐value materials such as liquid fuels, 4,5 mesophase pitch, 6 needle coke, 7 fine mosaic coke, 8 and activated carbon 9–13 …”

Section: Introductionmentioning

confidence: 99%

Synthesis and characterization of mesophase coke from medium–low‐temperature coal tar pitch modified by high‐pressure thermal polymerization

Bai

Zhu

et al. 2021

Asia-Pacific J Chem Eng

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Medium–low‐temperature coal tar pitch (MLP) is a by‐product of semi‐coke fabrication with a high content of carbon. However, the small amount of aromatic organic compounds in MLP makes prevents its practical use as a feedstock for the production of high‐quality artificial carbon materials (such as needle coke) via direct thermal conversion. To understand the effects of autogenous pressure thermal polymerization (APTP) on the microstructure of mesophase coke, we performed APTP at different reaction temperatures to produce MLP, which was further utilized as a starting material for the synthesis of mesophase coke. The microstructure of mesophase coke was studied by optical microscopy, X‐ray diffraction, Raman spectroscopy, and scanning electron microscopy. Moreover, the micro‐strength of the mesophase coke was examined. We concluded that the APTP treatment of MLP before direct carbonization of a liquid is an excellent method for the production of high‐quality mesophase coke.

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“…Many studies have focused on the hydrogenation mechanism of hydrodenitrogenation (HDN), hydrodesulfurization (HDS), hydrodeoxygenation (HDO), hydrodeasphaltene (HDA) of pure model compounds and a light fraction of middle to low temperature coal tar (MLCT) 12–21 . Only a number of studies on the hydrogenation of full‐range MLCT have been done mainly at the laboratory scale 22–24 …”

Section: Introductionmentioning

confidence: 99%

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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Kinetic parameter estimation and simulation of trickle-bed reactor for hydrodesulfurization of whole fraction low-temperature coal tar

Cited by 39 publications

References 57 publications

Thermal Conversion Behavior of Medium–Low–Temperature Coal Tar Pitch During Liquid–Phase Carbonization Process

Thermal Conversion Behavior of Medium–Low–Temperature Coal Tar Pitch During Liquid–Phase Carbonization Process

Synthesis and characterization of mesophase coke from medium–low‐temperature coal tar pitch modified by high‐pressure thermal polymerization

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

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