Experimental Methods for Developing Kinetic Models for Hydrocracking Reactions with Slurry-Phase Catalyst Using Batch Reactors

Quitian, Alexander; Ancheyta, Jorge

doi:10.1021/acs.energyfuels.5b01953

Cited by 48 publications

(28 citation statements)

References 88 publications

(292 reference statements)

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“…The reaction network proposed in this study was adapted from the pyrolysis of the polymer and rubber, as well as the hydrocracking of heavy petroleum fractions, ,− and it assumed to consist of four irreversible reactions (Figure ). The network was structured with two parallel hydrocracking reactions of polyethylene (PE) to heavy liquid (HL) and naphtha (N), and subsequent reactions of HL to N then gas (G).…”

Section: Resultsmentioning

confidence: 99%

Kinetic Modeling of Hydrocracking of Low-Density Polyethylene in a Batch Reactor

Jumah

Malekshahian

Tedstone

et al. 2021

ACS Sustainable Chem. Eng.

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Hydrocracking offers potential for the selective recovery of useful chemical fractions from polyolefin waste at relatively moderate reaction conditions with the possibility of heteroatom and contaminant tolerance. This study develops a kinetic model for low-density polyethylene (LDPE) hydrocracking over a bifunctional zeolite, namely, 1%Pt-β, using a lumping model that describes the kinetics in a batch process. In developing the kinetic model, mass transfer limitations and vapor–liquid equilibrium were taken into consideration. Kinetic parameters were estimated from experimental results obtained at a hydrogen pressure of 20 bar and different reaction temperatures (250–300 °C) as well as different batch reaction times (0–40 min). Kinetic parameters, mass transfer coefficients, and effectiveness factors were determined using a nonlinear regression model of the experimental results via MATLAB software. The physical properties of the product streams as well as vapor–liquid equilibrium data of the system were estimated using the flash unit in Aspen HYSYS software. The product stream was dominated by the naphtha fraction, decreasing with longer batch times. The results of the model indicate mild gas–liquid mass transfer limitation and unavoidable diffusion limitations of the macromolecules of molten LDPE and heavy liquid through the catalyst pores, especially at high reaction temperatures.

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Section: Resultsmentioning

confidence: 99%

Kinetic Modeling of Hydrocracking of Low-Density Polyethylene in a Batch Reactor

Jumah

Malekshahian

Tedstone

et al. 2021

ACS Sustainable Chem. Eng.

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“…The finely dispersed catalysts derived from natural ores are widely used in the industrial applications of slurry-phase hydrocracking, because of their availability as well as their low cost. Previously reported studies show that hydrocracking of heavy oil was performed by using different ores such as magnetite, limonite, molybdenite, hematite, ferrite, and laterite. − They were prepared by grinding, milling, sieving, and drying pieces of minerals . The use of red mud for vacuum residue (VR) hydrocracking in a batch slurry-phase mode was investigated by Nguyen-Huy et al The red mud contains different metal oxides, including hematite (Fe 2 O 3 ).…”

Section: Catalysts For Slurry-phase Hydrocrackingmentioning

confidence: 99%

Recent Advances in Heavy Oil Upgrading Using Dispersed Catalysts

Al‐Attas

Ali²,

Zahir³

et al. 2019

Energy Fuels

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Unconventional feedstocks, such as heavy vacuum residue (VR), have become potential candidates that could be positively exploited to meet the increasing demand of high-value transportation fuels, in view of the growing scarcity in other energy sources. However, such feeds contain extremely high-molecular-weight species, besides many impurities of heteroatom-containing organic compounds that lead to quick fouling, poisoning, and deactivation of catalysts. This causes a significant pressure decrease during the conventional hydrocracking in ebullated- or fixed-bed reactors. In contrast, slurry-phase hydrocracking has the ability to overcome these drawbacks through the enhancement of hydrogenation reactions in the presence of the dispersed catalysts. Slurry-phase processing is a resilient technology, which employs catalysts that are generally categorized as heterogeneous solid supported catalysts and homogeneously dispersed catalysts. The dispersed catalysts are classified into water or oil-soluble types and fine powders. Soluble dispersed catalysts show higher catalytic activity, compared to finely powdered catalysts, because of the in situ formation of infinitesimally minute active metal sites at high surface-area-to-volume ratios. Recent technologies and studies on heavy oil upgrading that implement the dispersed catalysts have been reviewed. Studies using a combination of two-phase catalysts have also been included.

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“…Among them, ei(x) is th Among e error. And the Gauss-Newton method is calculated as follows [Quitian and Ancheyta (2016)]:…”

Section: Lm Algorithmmentioning

confidence: 99%

A Control Algorithm for the Optimization of Batch Reactor-Based Processes

Bai¹,

Liu²

2019

Fluid Dynamics &Amp; Materials Processing

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Levenberg-Marquardt (LM) algorithm is applied for the optimization of the heat transfer of a batch reactor. The validity of the approach is verified through comparison with experimental results. It is found that the mathematical model can properly describe the heat transfer relationships characterizing the considered system, with the error being kept within ±2°C. Indeed, the difference between the actual measured values and the model calculated value curve is within ±1.5°C, which is in agreement with the model assumptions and demonstrates the reliability and effectiveness of the algorithm applied to the batch reactor heat transfer model. Therefore, the present work provides a theoretical reference for the conversion of practical problems in the field of chemical production into mathematical models.

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Experimental Methods for Developing Kinetic Models for Hydrocracking Reactions with Slurry-Phase Catalyst Using Batch Reactors

Cited by 48 publications

References 88 publications

Kinetic Modeling of Hydrocracking of Low-Density Polyethylene in a Batch Reactor

Kinetic Modeling of Hydrocracking of Low-Density Polyethylene in a Batch Reactor

Recent Advances in Heavy Oil Upgrading Using Dispersed Catalysts

A Control Algorithm for the Optimization of Batch Reactor-Based Processes

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