Hydroprocessing of Heavy Residues: Relation Between Operating Temperature, Asphaltene Conversion and Coke FORMATION

Absi‐Halabi, M.; Stanislaus, A.; Owaysi, Fathi; Khan, Zahida H.; Diab, Sonia

doi:10.1016/s0167-2991(08)61067-8

Cited by 8 publications

(8 citation statements)

References 8 publications

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“…The demetallization treatment apparently subjects the asphaltenic components to changes that permit their diffusion into the catalyst more effectively and allow them to undergo hydrogenation and hydrocracking reactions. The trend for HDN somewhat parallels that of HDAsph, because the nitrogen content in residues is closely linked with asphaltenic components . Finally, CCR conversion is observed to be almost the same for both types of feedstocks.…”

Section: Resultsmentioning

confidence: 65%

Residual-Oil Hydrotreating Kinetics for Graded Catalyst Systems: Effect of Original and Treated Feedstocks

et al. 2003

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In the upgrading of heavy petroleum oils and residues by hydrotreatment, multiple-reactor fixed-bed units loaded with different types of catalysts are used extensively. Catalysts for such hydrotreatment processes are chosen on the basis of activity, selectivity, and life. The performance of the overall hydrotreatment process, with regard to various reactions, such as hydrodesulfurization (HDS), hydrodenitrogenation (HDN), hydrodemetallization (HDM), asphaltenes cracking (HDAsph), and conversion to distillates, as well as catalyst life-on-stream, are clearly linked to the performance of the catalyst in different reactors. Information regarding the activity, selectivity, kinetic parameters, and deactivation of the individual catalysts are, therefore, highly desirable for optimizing reactor loading in the multiple-catalyst system. This paper presents the performance tests for various reactions on two types of industrial hydrotreating catalysts: those used at the midsection and the tail-end of a graded catalyst system designed to hydrotreat atmospheric residual oils. The tests were conducted using straight-run Kuwait atmospheric residue, a demetallized residue, and a demetallized/desulfurized residue. The activity and kinetic parameters for different reactions that are typically occurring during the hydroprocessing of these feedstocks were determined. The results revealed significant changes in activity, depending on the feedstock used for the tests. Furthermore, apparent rate orders and rate constants for some reactions were significantly changed. The study demonstrates the importance of proper selection of the feedstocks used in the performance evaluation and screening of candidate catalysts for graded catalyst systems for residual-oil hydrotreatment.

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Section: Resultsmentioning

confidence: 65%

Residual-Oil Hydrotreating Kinetics for Graded Catalyst Systems: Effect of Original and Treated Feedstocks

et al. 2003

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“…Better access of large molecules into the internal pores enhances the conversion rate and the distribution of metal deposits. The second effect of presulfiding is the reduction of the extent of early deactivation caused by coke deposition . It has been observed that passivation of the highly active acidic oxide site reduces the coke formation tendency by presulfiding practice.…”

Section: Methodsmentioning

confidence: 99%

Improvement of the Middle Distillate Yields during Crude Oil Hydrotreatment in a Trickle-Bed Reactor

2011

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“…In our previous studies [13,14] attention was paid to understand the role of asphaltenes and operating severity in sediment formation. The effect of adding aromatic rich gas oils as diluents to vacuum residue (VR) feed on various conversions as well as on sediment formation was reported by us in a recent paper [15].…”

Section: Introductionmentioning

confidence: 99%

Investigation of the mechanism of sediment formation in residual oil hydrocracking process through characterization of sediment deposits

2005

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Hydroprocessing of Heavy Residues: Relation Between Operating Temperature, Asphaltene Conversion and Coke FORMATION

Cited by 8 publications

References 8 publications

Residual-Oil Hydrotreating Kinetics for Graded Catalyst Systems: Effect of Original and Treated Feedstocks

Residual-Oil Hydrotreating Kinetics for Graded Catalyst Systems: Effect of Original and Treated Feedstocks

Improvement of the Middle Distillate Yields during Crude Oil Hydrotreatment in a Trickle-Bed Reactor

Investigation of the mechanism of sediment formation in residual oil hydrocracking process through characterization of sediment deposits

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