New kinetic model of coal tar hydrogenation process via carbon number component approach

Dai, Fei; Gong, Maoming; Li, Chunshan; Li, Zengxi; Zhang, Suojiang

doi:10.1016/j.apenergy.2014.10.009

Cited by 34 publications

(24 citation statements)

References 33 publications

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“…Based on the product composition, Tang et al proposed a reaction scheme of aromatics that suggests that the hydrogenation reactions dominate over the aromatics containing fewer methyl substituents and that complete saturation of double aromatic rings is inhibited by the methyl substituents. Similar to designing catalysts, the reactor and process designing also carries equal importance within different coal tar characteristic methods and reaction kinetics. − …”

Section: Introductionmentioning

confidence: 99%

Co-production of Naphthenic Oil and Phenolic Compounds from Medium- and Low-Temperature Coal Tar

Huang

Feng

Liang

et al. 2021

Ind. Eng. Chem. Res.

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The conversion of medium-and low-temperature coal tar into high-performance fuel and value-added chemicals is one of the main approaches to addressing the current global energy challenges. To this aim, an innovative coal tar processing process has been developed, which enables the efficient transformation. This process is suggested to produce phenolic compounds and naphthenic oil. As the hydrogenation of coal tar involves complex chemical structures and reactions, a systematic matrix of model compounds was presented on the basis of qualitative and quantitative analytics to represent the coal tar and hydrogenation products. The kinetics modeling of tar hydrogenation was proposed to optimize the process parameters and predict the characteristics of products. The energy efficiency (81.62%) and the element utilization (carbon (88.21%), hydrogen (87.13%), and oxygen (31.25%)) associated with the whole process are calculated. From the life cycle assessment, the energy use, the CO 2 emission, and the target costing of the proposed coal tar process are calculated as 10.82 MJ/CNY, 2.71 kg CO 2 -eq/CNY, and 3141.2 CNY/t-product, respectively.

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Section: Introductionmentioning

confidence: 99%

Co-production of Naphthenic Oil and Phenolic Compounds from Medium- and Low-Temperature Coal Tar

Huang

Feng

Liang

et al. 2021

Ind. Eng. Chem. Res.

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“…The kinetic simulation of the hydrogenation process can extremely promote the cognitive of reaction mechanism and strongly provide inspiration to the coal tar industry for process design, optimization, and device operation. Dai et al 25,26 . studied the kinetic modeling of light distillation of MLCT by dividing the feedstock and product into eight lumps based on carbon numbers and also built an advanced lumping kinetic model of MLCT depending on the boiling point, carbon numbers, and molecule structure, which can predict in detail bulk properties of products.…”

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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“…Nowadays, due to the limited reserves of crude oil and the increasing speed of global economic development, the search for alternatives to crude oil has become the focus of many energy industry scholars. , Biomass oil, , shale oil, , and coal-based oil − are the topics of most concern. The potential value of coal tar, the byproduct of coal pyrolysis, has always been a research hotspot. , Many scholars have studied the technology of coal tar hydrogenation − and mostly focused on the exploration of the hydrogenation process and the development of catalysts. − Many other scholars have tried to describe the reaction by the kinetic model. − In addition, some scholars have studied the mechanism of model compounds’ hydrogenation reactions, such as benzene, naphthalene, thiophene, quinoline, and others.…”

Section: Introductionmentioning

confidence: 99%

Combined Process of Hydrocracking and Hydrofining of Coal Tar

et al. 2020

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For coal tar hydrotreating technology, the combination of hydrofining and hydrocracking is a valuable research topic. Therefore, this paper will discuss this topic by comparing three different hydrogenation processes, which include hydrofining (process A); catalyst gradation of hydrofining and hydrocracking (process B); and hydrocracking of diesel fraction produced by hydrofining (process C). The research methods are mainly divided into three parts: product composition analysis, product properties analysis, and reaction kinetics analysis. The study reached the following conclusions: First, the combination of hydrofining and hydrocracking can get better quality gasoline and diesel oil. Second, process C has many advantages over process B and process A. The carbon number and hydrogen number of process C products are more concentrated. In process C, alkaline nitrogen is separated from coal tar in the form of ammonia with water or gas, so process C can effectively improve the service life of hydrocracking catalyst. Third, compared with the two catalysts graded and packed in the reactor, the two-stage hydrogenation method is more convenient in adjusting the ratio of gasoline to diesel oil. Finally, process C is recommended to complete the hydrogenation of coal tar through the analysis of the product composition, reaction path, and reaction kinetics.

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New kinetic model of coal tar hydrogenation process via carbon number component approach

Cited by 34 publications

References 33 publications

Co-production of Naphthenic Oil and Phenolic Compounds from Medium- and Low-Temperature Coal Tar

Co-production of Naphthenic Oil and Phenolic Compounds from Medium- and Low-Temperature Coal Tar

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

Combined Process of Hydrocracking and Hydrofining of Coal Tar

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