Production of liquid fuels from low-temperature coal tar via hydrogenation over CoMo/USY catalysts

Meng, Jie; Yang, Jiake; Fang, Jie; Li, Na; Yang, He; Huang, Hui-Zi; Lu, Jiangyin

doi:10.1007/s11144-019-01576-y

Cited by 15 publications

(8 citation statements)

References 67 publications

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“…Under the action of the Ni–Mo/γ-Al 2 O 3 catalyst, the probability of ring-opening reaction of naphthalene and decalin is very low . Therefore, the final product of naphthalene hydrogenation is decalin.…”

Section: Resultsmentioning

confidence: 99%

“…At the same time, the research results of coal tar hydrogenation technology have been reported in many literature studies. Some researchers mainly focus on the study of hydrogenation process − and efficient catalyst; − others researchers try to describe the hydrogenation reaction of coal tar through a kinetic model. − In order to simplify the research process, one or more compounds, such as benzene, naphthalene, thiophene, quinoline, phenanthrene, and dibenzothiophene, are used as raw materials to complete the hydrogenation experiment. The advantages of this research method are outstanding, which can clearly explain the reaction law.…”

Section: Introductionmentioning

confidence: 99%

“…In the published literature on coal tar hydrogenation, catalysts are usually used alone. ,,− However, this is rarely the case in industrial production. − The most common method is to load various catalysts by stages, but there are few reports on it. Coal tar hydrogenation technology has been realized industrially, and the research results are best to provide a reliable basis for industrial design or technical improvement directly.…”

Section: Introductionmentioning

confidence: 99%

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Hydrofining Process of Coal Tar Based on Four Kinds of Catalyst Grading

Niu

Fan

et al. 2020

Energy Fuels

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Although the mechanism of coal tar hydrogenation technology has not been fully revealed, many enterprises have realized the industrialization of this technology through the reference of crude oil hydrogenation technology. Therefore, it will be very helpful for the development of this technology to present a research result close to industry. Based on four kinds of catalyst gradations, the hydrogenation experiments of different processes and a series of 1200 h long-term experiments were carried out in a four-tube fixed bed reactor with coal tar distillate (IBP ≈ 360 °C) as the raw material. First, based on the product composition of different reactor outlets, the composition changes and main reaction process of coal tar in four reactors were summarized. It was found that the reactions in the four reactions are different and related. The hydrogenation of olefins mainly takes place in the first reaction (230 °C, hydrofining guard catalyst and hydrodemetallization catalyst). Most of the oxygenated compounds were transformed in the second reactor (320 °C, hydrogenation catalyst I) but not completely. The hydrogenation of aromatics is mainly concentrated in the third and fourth reactors, but there are already signs of this reaction in the second reactor. Second, the influence of different process conditions on the product properties and the material balance under different process conditions were summarized. Finally, the stability of the grading system is verified by the long-term experiments.

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Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Hydrofining Process of Coal Tar Based on Four Kinds of Catalyst Grading

Niu

Fan

et al. 2020

Energy Fuels

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“…Because of its high density and high viscosity, asphaltene is not suitable for hydrogenation with light fractions. It is a common practice to use light components of coal tar as raw materials for hydrogenation. − …”

Section: Methodsmentioning

confidence: 99%

“…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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