The reduction of FCCU afterburning through process optimization and regenerator revamping

Chemical Industry & Chemical Engineering Quarterly

Published On 2022/5/4

Operating the fluid catalytic cracking unit (FCCU) in afterburning conditions can increase the regenerator temperatures above the metallurgical design leading to mechanical failures of the cyclones and plenum chamber. This paper presents the methodology applied in a commercial FCCU to investigate the afterburning causes and the technical solutions that can be implemented to reduce the afterburning. Thus, by evaluating the regenerator temperature profile, regenerator as-build design, and the internals mechanical status, it was concluded that the main cause of afterburning was the non-uniform distribution and mixing of air and catalyst. The industrial results showed that optimizing the catalyst bed level, stripping steam, reaction temperature, and equilibrium catalyst (e-cat) activity reduced the afterburning by 39%. Other process parameters such as feed preheat temperature, slurry recycling, and excess oxygen did not significantly influence afterburning because of air and catalyst maldistribution. Revamping the regenerator to assure a symmetrical layout of cyclones reduced the afterburning by 86%, increased the fines retention in FCCU inventory, and provided a better regeneration of the spent e-cat. The reduction of operating temperatures at around 701 C removed the risk of catalyst thermal deactivation, and therefore the e-cat activity was increased by 10.2 wt.%.

Journal

Chemical Industry & Chemical Engineering Quarterly

Published On

2022/5/4

Volume

28

Issue

2

Page

115-126

Authors

Ion Bolocan

Ion Bolocan

Universitatea Petrol-Gaze din Ploiesti

Position

Professor of Organic Chemistry

H-Index(all)

8

H-Index(since 2020)

6

I-10 Index(all)

0

I-10 Index(since 2020)

0

Citation(all)

0

Citation(since 2020)

0

Cited By

0

Research Interests

Chemical Engineering

Chemistry

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Ion Bolocan

Ion Bolocan

Universitatea Petrol-Gaze din Ploiesti

Reaction Kinetics, Mechanisms and Catalysis

Hydrodeoxygenation and hydrocracking of oxygenated compounds over CuPd/γ-Al2O3–ZSM-5 catalyst

Biomass is one of the most important renewable energy resources to produce sustainable liquid fuel. This study presents the process of hydrodeoxygenation/hydrocracking on a model of oxygenated compounds such as fatty acid methyl esters using a bifunctional catalyst that contains a metallic function based on copper and palladium and an acid function type ZMS-5. Hydrocracking of methyl esters on the bifunctional catalyst CuPd/γ-Al2O3–ZSM-5 realized on a fix bed reactor led to obtaining of n-alkanes, iso-alkanes, saturated and aromatic cyclic hydrocarbons with 9 to 18 carbon atoms. The conversion reach 100% value at temperature higher than 350 °C. The yield in n-alkanes varies with a maximum at temperature of 325 °C, meanwhile, the yield in iso-alkanes remains approx. constant. The cyclization and aromatization reactions are favored at temperatures higher than 350 °C.

Ion Bolocan

Ion Bolocan

Universitatea Petrol-Gaze din Ploiesti

ChemistrySelect

Rhenium Effect on the Performance of CoMoNi/γ‐Al2O3 Catalyst in Thiophene Hydrodesulphurization. Performance Evaluation and Process Kinetics

The rhenium effect on the performance of CoMoNi/γ‐Al2O3 catalyst was studied in thiophene hydrodesulphurization. The unsulfided and freshly sulfided catalysts were characterized by N2 adsorption‐desorption, IR spectroscopy, X‐ray photoelectron spectroscopy (XPS) and total acidity. The effects of reaction temperature, pressure, and liquid hourly space velocity (LHSV) on thiophene HDS performance shown that the activity of the CoMoNiRe/γ‐Al2O3 catalyst for thiophene HDS was superior to that of the CoMoNi/γ‐Al2O catalyst, which was mainly ascribed to the higher acidic functional groups. Based on Langmuir‐Hinshelwood approach, a kinetic model for thiophene HDS over both catalysts have been developed. In this respect, two mechanisms have been considered, one hypothesizing that hydrogen is adsorbed on different active centers than thiophene (two‐centers mechanism) and the other considering …

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Mohammad Bazmi

Mohammad Bazmi

Amirkabir University of Technology

Chemical Industry & Chemical Engineering Quarterly

Thermodynamic modeling of gas solubility in Ionic Liquid employed as sweep solvent for methanol synthesis

This work aimed at the thermodynamic modeling of gas solubility in ionic liquids (ILs) using the Soave-Redlich-Kwong (SRK), cubic-plus-association (CPA), and perturbed-chain statistical associating fluid theory (PC-SAFT) equations of state. Wherefore, the routines were developed for the parameterization of ILs. Then, the ILs were implemented in the Aspen plus simulator to evaluate the equations of state and explore the phase equilibrium data with the predictive equations and the correlation of the binary interaction parameter. Hence, it was verified the correlation of the density and speed of sound curves presented limitations to correcting the slope of the curves of pure ILs. Nonetheless, the PC-SAFT with the 4C associative scheme demonstrated a better fit for the thermophysical properties. As for the prediction of phase equilibrium for the [EMIM][TfO], the PC-SAFT with the 2B scheme showed a better fit with CO 2, while the CPA with the 2B scheme presented the best result for H 2 S. For [OMIM][NTf 2], the PC-SAFT with the 1A scheme showed better results with CO 2, and the CPA with the 2B scheme showed the lowest deviation with H 2 S.

Julieta Cerioni

Julieta Cerioni

Universidad Nacional de La Plata

Chemical Industry & Chemical Engineering Quarterly

Obtaining xylitol by hydrolysis-hydrogenation of liquors derived from sugarcane bagasse

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