Use of a Dual-Bed System for Producing Diesel Fuel from a Mixture of Straight-Run Diesel and Rapeseed Oil over Sulfide Catalysts

Власова, Е. Н.; Deliy, Irina V.; Gerasimov, E. Yu.; Aleksandrov, Pavel V.; Nuzhdin, Alexey L.; Aleshina, G. I.; Bukhtiyarova, G. A.

doi:10.1134/s0965544117060263

Cited by 7 publications

(5 citation statements)

References 13 publications

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“…However, these oils have different compositions than crude distillates and need new processing technologies to be refined. The main distinction between the two feedstocks is the significant content of oxygen in bio-oils, primarily in the form of triglyceride compounds; for petroleum fractions, the oxygen content is so low that it can be neglected . Triglyceride containing feedstocks can be converted alone or coprocessed with petroleum fractions; for practical and economic reasons, the latter is preferred .…”

Section: Perspectives Of the Catalyst Stacking Technologymentioning

confidence: 99%

“…Vlasova et al optimized two-layer catalytic systems with a MoS 2 /Al 2 O 3 catalyst in the upper bedwhere the direct HDO takes placeand a conventional CoMo/Al 2 O 3 and NiMo/Al 2 O 3 catalysts in the bottom layerwhere deep HDS occurswith promising results for the production of ULSD from mixtures of SRGO and rapeseed oil. − The researchers have found that the utilization of the mentioned stacked-bed configurations instead of single-bed conventional promoted TMS catalysts can increase the diesel yields, eliminate CO and CO 2 gas formation, avoid further purification of recycled hydrogen contaminated with CO, prolong the process cycle length, and improve end-product quality.…”

Section: Perspectives Of the Catalyst Stacking Technologymentioning

confidence: 99%

“…The main distinction between the two feedstocks is the significant content of oxygen in bio-oils, primarily in the form of triglyceride compounds; for petroleum fractions, the oxygen content is so low that it can be neglected. 91 Triglyceride containing feedstocks can be converted alone or coprocessed with petroleum fractions; for practical and economic reasons, the latter is preferred. 92 The removal of oxygen from triglycerides can be achieved through hydrotreating; their hydrodeoxygenation (HDO) can proceed via two distinct routes.…”

Section: Perspectives Of the Catalyst Stacking Technologymentioning

confidence: 99%

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Catalyst Stacking Technology as a Viable Solution to Ultralow Sulfur Diesel Production

2022

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Production of ultralow sulfur diesel (ULSD) is a tough challenge for refineries previously producing low sulfur diesel. Some common solutions to meet the stricter standards are revamping pre-existing units, building new facilities, purchasing high-activity catalysts, adapting alternative desulfurization techniques, and changing the feedstock; however, these methods usually entail high capital investments or are simply not viable. Another option, generally overlooked, is to place different catalysts in multibed configurations to produce a synergistic effect between them, i.e., catalyst stacking technology. This work aims to broaden the current knowledge and scope of this technology and suggest it as a viable low-investment solution for ULSD production. As we have described, the differences between the catalysts can be exploited to maximize the performance and minimize the operating costs of HDS units. Moreover, any new HDS catalyst performance could benefit from a fitting stacked-bed system, especially if it has high production costs. However, the synergistic effect between the catalysts is not fully understood yet, and designing the best stacking system (number, order, and proportions of the catalysts) is not straightforward. Many factors must be considered, such as the characteristics of the catalysts (active phase, support, and kinetic parameters), feedstock composition, operating constraints, and target end product. Currently, the selection of the optimal configuration is inadequately approached case by case and requires multiple catalytic evaluations on an industrially relevant scale because a reliable predictive method has not been established yet. Therefore, valuable time and resources could be saved by thoroughly studying the influences of the variables on the synergetic effects and developing new mathematical models. Furthermore, there are still many alternative applications of this technology that could solve current and future issues of the refining industry, like the reuse of spent catalysts and the coprocessing of bio-oils with conventional feedstocks.

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Section: Perspectives Of the Catalyst Stacking Technologymentioning

confidence: 99%

Section: Perspectives Of the Catalyst Stacking Technologymentioning

confidence: 99%

Section: Perspectives Of the Catalyst Stacking Technologymentioning

confidence: 99%

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Catalyst Stacking Technology as a Viable Solution to Ultralow Sulfur Diesel Production

2022

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“…Several metal-based catalysts have been proposed for these reactions: from transition to noble metal catalysts . These catalysts show high activity for the removal of heteroatoms in hydrodesulfurization, hydrodenitrogenation, and hydrodeoxygenation processes. , Catalysts commonly used in industrial hydrotreating units are transition metal sulfides (Mo or W) promoted by Ni or Co onto alumina …”

Section: Introductionmentioning

confidence: 99%

“…9 These catalysts show high activity for the removal of heteroatoms in hydrodesulfurization, hydrodenitrogenation, and hydrodeoxygenation processes. 10,11 Catalysts commonly used in industrial hydrotreating units are transition metal sulfides (Mo or W) promoted by Ni or Co onto alumina. 12 An additional hydroisomerization (HIS) is required to improve the cold-flow properties of the linear alkanes.…”

Section: Introductionmentioning

confidence: 99%

Production of Biofuels from Hydrodeoxygenation and Hydroisomerization of Triglycerides with Metal-Supported SAPO-11 Molecular Sieves

Torres-Bujalance,

Prieto,

Rodriguez Espinoza

et al. 2024

Energy Fuels

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Hydroprocessing of fats and oils is being implemented as the main alternative to fossil fuels. Industrial-scale routes are based on a complex sequence of reactors and unit operations of separation: hydrodeoxygenation, fractionation, downstream hydrocracking/hydroisomerization, and final purification. In the present work, one-step conversion of triglycerides using nonsulfided metalloaded silicoaluminophosphates-11 (SAPO-11) molecular sieves is proposed to convert triglyceride feedstocks to isomerized renewable hydrocarbons. Different noble (Pd, Pt) and transition (Ni, Cu) metals were impregnated onto a SAPO-11 molecular sieve. The resulting bifunctional catalysts were characterized by ICP-OES, adsorption−desorption N 2 at −196 °C, n-propylamine temperature-programmed desorption, X-ray fluorescence spectroscopy, SEM, and TEM. The catalytic behavior was tested in a stirred tank reactor device, using refined vegetable oil as reference triglyceride. The operation conditions were set at 50 bar, 350 °C under 800 rpm stirring. The effect of the different metals on the catalytic performance was evaluated in terms of conversion of triglycerides, yield to hydrocarbons (naphtha, kerosene, diesel, and heavy fractions), and isomerization activity. The highest yield to liquid hydrocarbons of 73.1% was obtained for a nickel-based SAPO-11 with an 8% metal loading. Among the different metals evaluated (Pt, Pd, Ni, Cu), nickel showed the highest isomerization activity with the highest iso/n-paraffins ratio of 0.92. In all cases, a fraction of heavy hydrocarbon was obtained, suggesting that long residence time led to undesired side reactions.

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Toward HYD/DEC selectivity control in hydrodeoxygenation over supported and unsupported Co(Ni)-MoS2 catalysts. A key to effective dual-bed catalyst reactor for co-hydroprocessing of diesel and vegetable oil

et al. 2020

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Use of a Dual-Bed System for Producing Diesel Fuel from a Mixture of Straight-Run Diesel and Rapeseed Oil over Sulfide Catalysts

Cited by 7 publications

References 13 publications

Catalyst Stacking Technology as a Viable Solution to Ultralow Sulfur Diesel Production

Catalyst Stacking Technology as a Viable Solution to Ultralow Sulfur Diesel Production

Production of Biofuels from Hydrodeoxygenation and Hydroisomerization of Triglycerides with Metal-Supported SAPO-11 Molecular Sieves

Toward HYD/DEC selectivity control in hydrodeoxygenation over supported and unsupported Co(Ni)-MoS2 catalysts. A key to effective dual-bed catalyst reactor for co-hydroprocessing of diesel and vegetable oil

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