Catalyst pore plugging effects on hydrocracking reactions in an Ebullated bed reactor operation

Tailleur, Roberto Galiasso; Caprioli, Lino

doi:10.1016/j.cattod.2005.08.026

Cited by 33 publications

(12 citation statements)

References 10 publications

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“…The three particular reaction routes that are interesting regarding the main hydroprocessing goals for HT-STPO are hydrodesulfurization (HDS), hydrodearomatization (HDA), and hydrocracking (HC). Hydrotreaters have a critical role for facing major refinery challenges within the so-called biorefinery and waste refinery concepts. , NiMo and CoMo catalysts supported on Al 2 O 3 have been widely used for hydrotreating petroleum derived heavy feedstock. − The activity and performance of this type of catalyst toward hydrotreating reactions have proven to be very high, particularly for the removal of heteroatoms (like sulfur or nitrogen) from heavy hydrocarbon feedstock. ,, However, when higher activity is desired, significant improvements can be achieved by using more active metallic phases like Pt, Pd, or Ir − supported over tailored supports for enhancing cracking reactions, i.e., zeolites − or innovative mesoporous materials. − It is also well-known that in this type of industrial hydrocracking reaction with highly active catalysts, catalyst deactivation (mainly due to coke formation issues) plays a key role in the economical viability of the whole process. − …”

Section: Introductionmentioning

confidence: 99%

Prospects for Obtaining High Quality Fuels from the Hydrocracking of a Hydrotreated Scrap Tires Pyrolysis Oil

et al. 2015

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The hydrocracking of hydrotreated scrap tires pyrolysis oil (HT-STPO) has been studied aiming high-quality refinery blends for alternative automotive fuels. The hydrocracking runs have been carried out with a PtPd/SiO 2 -Al 2 O 3 catalyst in a fixed-bed reactor at 10 440-500 ºC, 65 bar and space time of 0.16 h. The catalyst has been characterized by ICP-AES, N 2 adsorption-desorption isotherms, and tert-butylamine adsorptiondesorption (TPD), while coke has been studied both quantitatively and qualitatively by TG-TPO, FTIR-TPO and Raman spectroscopy. During the first 2 h of reaction and at temperatures above 480 ºC, we have been able to: (1) reach ultra low sulfur levels lower 15 than 15 ppm; (2) remove almost completely of the less interesting fraction -boiling points higher than 250 ºC, named as gasoil fraction-with remaining amounts lower than 1 wt%; (3) with a paraffinic and isoparaffinic content higher that 70 wt%. Catalyst deactivation is due to coke deposition having both aromatic and aliphatic nature, while the aromaticity increases with process temperature. It has been proved that the 20 temperature conditions can be tuned to reach a state in which coke is generated at the same rate that is being hydrocracked.

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Section: Introductionmentioning

confidence: 99%

Prospects for Obtaining High Quality Fuels from the Hydrocracking of a Hydrotreated Scrap Tires Pyrolysis Oil

et al. 2015

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“…Furimsky and Massoth describe deactivation by nitrogen compounds, coke deposits, and metals. Galiasso Tailleur and Caprioli studied catalyst deactivation (NiMo/γ-Al 2 O 3 ) in an ebullated-bed reactor , and conclude that short-term deactivation is due to the formation of a coke layer blocking the pores on the catalyst outside surface. Long-term deactivation is mainly due to metal deposits and causes a typical U shape profile across the diameter of the catalyst pellets.…”

Section: Introductionmentioning

confidence: 99%

A Review of Thermal Cracking, Hydrocracking, and Slurry Phase Hydroconversion Kinetic Parameters in Lumped Models for Upgrading Heavy Oils

et al. 2021

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Reaction constants for vacuum gas oil (VGO) hydrocracking and slurry phase hydroconversion of residues are calculated and positioned with respect to results from the literature. This perspective shows that results are well-correlated, despite a range of experimental set-ups and various feedstocks, author assumptions, and kinetic schemes being used. We observe that for vacuum residues (VR), slurry phase hydroconversion is essentially equivalent to thermal cracking with free radical production stabilized through hydrogenation reactions. This work also highlights the importance of catalyst type for conversion of heavy oils, identifies limitations in estimating kinetic parameters for the VGO lump in thermal cracking, and validates our results.

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“…However, the use of cutting-edge technologies is required for upgrading the oil properties because of the low quality as well as the difficulties in transporting heavy oil. , Hydrocracking as a refining process is usually considered the most efficient technique to convert heavy fractions in heavy crude oil into valuable products like naphtha . Various kind of reactors including fixed-bed, moving-bed, ebullated-bed, , and slurry bed reactors can be used in the hydrocracking process in which the type of reactor depends on the conversion level and the amount of metals and asphaltenes in the heavy crude oil . Catalyst deactivation during hydrocracking, deposition of coke, and formation of sludge in the product are the main operational problems in the hydrocracking process …”

Section: Introductionmentioning

confidence: 99%

Computational Fluid Dynamic Modeling and Simulation of Hydrocracking of Vacuum Gas Oil in a Fixed-Bed Reactor

et al. 2020

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A four-lump computational fluid dynamic (CFD) model was proposed for the investigation of vacuum gas oil hydrocracking in a trickle-bed reactor. The experiment was conducted at 360–390 °C and 146 bar in the reactor at three different flow rates. It was found that the modeling predictions of vacuum gas oil cracking agreed well with the experimental measurements. Furthermore, the developed model analyzed the effects of the feed flow rate in the reactors on the concentration distribution and product yield. The maximum yields of the products including distillate (31%), naphtha (14%), and gas (3%) were obtained at the lowest feed flow rate. However, the feed flow rate enhancement from 0.1568 to 0.2059 kg·h –1 led to the increasing feed concentration and reducing the product concentration at the outlet of the reactor. The latter phenomenon was happened due to the decreasing feed residence time with the increasing mass flow rate.

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Catalyst pore plugging effects on hydrocracking reactions in an Ebullated bed reactor operation

Cited by 33 publications

References 10 publications

Prospects for Obtaining High Quality Fuels from the Hydrocracking of a Hydrotreated Scrap Tires Pyrolysis Oil

Prospects for Obtaining High Quality Fuels from the Hydrocracking of a Hydrotreated Scrap Tires Pyrolysis Oil

A Review of Thermal Cracking, Hydrocracking, and Slurry Phase Hydroconversion Kinetic Parameters in Lumped Models for Upgrading Heavy Oils

Computational Fluid Dynamic Modeling and Simulation of Hydrocracking of Vacuum Gas Oil in a Fixed-Bed Reactor

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