Effect of phosphorus modification on the coal tar hydrogenation activity of the Ni–Mo/γ-Al2O3 catalyst

Li, Dong; Niu, Menglong; Yang, Zhanbiao; Wang, Shukuan; Fan, Zheng; Feng, Xiang; Li, Wenhong

doi:10.1007/s11144-018-1418-9

Cited by 10 publications

(6 citation statements)

References 39 publications

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“…If the target is to remove sulfur and nitrogen, the appropriate temperature will be 360 °C. In recent years, 360 °C has been widely adopted as a reaction temperature in the study of coal tar hydrogenation. ,,− , In addition, the change of the temperature in reactor 2 has less effect on the properties of the products. This is mainly due to the fact that the sulfur and nitrogen compounds in coal tar that are easy to be converted have been converted in the first reactor, while the sulfur and nitrogen compounds that are difficult to be converted are difficult to be converted in the second reactor.…”

Section: Resultsmentioning

confidence: 99%

“…Crude oil is particularly important in many fossil energy sources. However, the current crude oil production cannot fully meet the demand, and the oil resources are decreasing. , Therefore, many scholars are committed to finding suitable crude oil substitutes, such as biomass oil, , shale oil, , and coal tar. − …”

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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“…It is a common practice to use light components of coal tar as raw materials for hydrogenation. 10−16 In the experiment, the self-made Ni-Mo/γ-Al 2 O 3 catalyst 34 was selected as the hydrofining catalyst. The hydrocracking catalyst used in this study is a kind of catalyst which can be obtained from commercial channels, and its code name is FC36.…”

Section: Methodsmentioning

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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“…As mentioned previously, the published literature on experimental research and reactor simulation of HTCT HDS reaction is not abundant. Our research team has been carried out a lot of research on the technology of hydrogenation of whole-fraction LTCT to produce fuel oil in the early stage, and we achieved certain results in terms of catalyst grading, optimization of operating conditions, and kinetic simulation. ,,,− This prompted us to tentatively propose to hydrotreat HTCT to produce clean fuel oil. Based on the hydrogenation test data, the HDS reaction mechanism was investigated, and nonlinear regression methods were used to obtain optimal kinetic parameters.…”

Section: Introductionmentioning

confidence: 99%

Kinetic Parameter Calculation and Trickle Bed Reactor Simulation Based on Pilot-Scale Hydrodesulfurization Test of High-Temperature Coal Tar

et al. 2020

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At present, a few chemicals can be separated after further processing of high-temperature coal tar (HTCT) distillates, which have a lower utilization. However, hydrogenation to produce clean fuel oil has not been widely reported in literature. Thus, due to the use of new feedstocks and the implementation of more severe environmental legislations, deep hydrodesulfurization (HDS) of HTCT will face formidable challenges. A series of HDS experiments were performed in a continuous isothermal trickle bed reactor in which the reactor temperature was varied from 648 to 678 K, the pressure from 12 to 16 MPa, and the liquid hourly space velocity (LHSV) from 0.25 to 0.35 h–1, and hydrogen-to-oil ratio kept constant at 2000 L/L. Based on the experimental data, possible reaction pathways of HDS reaction were investigated, and a modified Langmuir–Hinshelwood (LH) HTCT desulfurization kinetic model was established. gPROMS software was used to obtain optimal kinetic parameters that are as follows: EA = 26,842, K 0 = 93,958, α = −1.14, n = 1.65, and m = 0.86. The model can well reproduce various working conditions and has better prediction accuracy. Some characteristics of HTCT HDS reactions were discovered; the reaction order (n) of HTCT HDS is slightly higher than that of crude oil and medium/low-temperature coal tar (M/LTCT), but the activation energy (EA) is relatively smaller. The established reactor model was used to predict the changes of the concentration of hydrogen, hydrogen sulfide, and sulfur compounds in the gas, liquid, and solid phases along the length of the reactor, respectively. The model was also used to predict the effects of pressure, temperature, and LHSV on the conversion rate of sulfur and catalyst effectiveness factors. The results showed that the LHSV has a greater impact on the conversion rate, and the pressure and temperature are less pronounced at high-severity operating conditions; the effectiveness factor is significantly smaller than that of other HDS processes, temperature has a greater effect on the effectiveness factor, followed by pressure and LHSV. The conclusion can provide a basis for further understanding the HTCT hydrotreating process.

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Effect of phosphorus modification on the coal tar hydrogenation activity of the Ni–Mo/γ-Al2O3 catalyst

Cited by 10 publications

References 39 publications

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

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

Combined Process of Hydrocracking and Hydrofining of Coal Tar

Kinetic Parameter Calculation and Trickle Bed Reactor Simulation Based on Pilot-Scale Hydrodesulfurization Test of High-Temperature Coal Tar

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