Pilot Plant Studies on Accelerated Deactivation of Commercial Hydrotreating Catalyst

Venkatesh, R.; Bhaskar, M.; Sakthivel, S.; Selvaraju, N.; Velan, M.

doi:10.1080/10916460903066478

Cited by 8 publications

(3 citation statements)

References 3 publications

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“…Accurate measurement of HDS catalyst deactivation rate under commercially-relevant conditions is not straightforward and usually required performance testing for extended period of time as the values are in the range of 1°C/month. Different protocols have been reported to accelerate HDS catalysts deactivation in order to understand the deactivation mechanisms and kinetics, but the conditions are usually far from the commercial unit's [18][19][20]. Therefore in order to estimate the cycle length of the different catalyst combination presented in this study, values provided by the catalyst supplier for the fresh CoMo-2 (reference configuration) have been applied to the modified operating window of the different scenarios.…”

Section: Resultsmentioning

confidence: 99%

Maximizing utilization of reactivated and left-over catalysts in heavy gas oil hydrotreater: A case study of ADNOC Refining

Laveille

Chaudhry

Riva³

et al. 2018

Oil Gas Sci. Technol. – Rev. IFP Energies nouvelles

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Recently, ADNOC Refining Research Center (ARRC) has studied the possibility to maximize the reutilization of left-overs and reactivated hydrodesulfurization catalysts for one of its hydrotreater producing Ultra Low Sulfur Diesel (ULSD) from Heavy Gas Oil (HGO). Based on the refinery inventory, several catalyst configurations composed of different amounts of reactivated and fresh CoMo catalyst, including a full reactivated configuration having a stacked CoMo/NiMo/CoMo combination (50/25/25), have been tested in a pilot-plant reactor under commercially-relevant conditions. Experimental results in terms of reactor bed temperature, H2 consumption, aromatics and diesel yields have been analyzed and compared to the current commercial hydrotreater load and catalyst supplier forecasts for the studied configurations. Results show excellent performances of reactivated catalysts and a strong effect of the NiMo layer in the case of the stacked configuration. In a pure CoMo configuration, up to 75% reactor volume of reactivated catalyst could be utilized without impacting the product quality and cycle length, compared to a full fresh CoMo catalyst load. The full reactivated stacked configuration performed even better than the full fresh CoMo catalyst, without impacting product quality and diesel yield. Potential effect of the reactivated catalysts on the reaction selectivity and the role of the NiMo layer in the stacked configuration are discussed. Pilot-plant experimental data were in strong accordance with catalyst supplier commercial forecasts, emphasizing the quality of the pilot-plant study. Implementation of one of the studied configuration by the refinery could lead to between 30% and 55% savings on the cost of catalyst for the next load.

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Section: Resultsmentioning

confidence: 99%

Maximizing utilization of reactivated and left-over catalysts in heavy gas oil hydrotreater: A case study of ADNOC Refining

Laveille

Chaudhry

Riva³

et al. 2018

Oil Gas Sci. Technol. – Rev. IFP Energies nouvelles

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“…Alumina is used for its ability to form easily [1] nanoclusters, owing to its high surface area and ability to disperse metal particles onto the support. Another advantage of alumina is its mechanical and chemical stabilities, while a disadvantage is its tendency to promote carbon deposition because of its mild acidity [3,4,8,9].…”

Section: Introductionmentioning

confidence: 99%

“…In addition, it is the most important deactivation mechanism for catalysts used for the hydrotreating of middle distillates. Other types of deactivation are caused by the deposition of metals (metal sintering), thermal degradation, or segregation of the active phase [6,8,[10][11][12]. The catalyst may be poisoned by the contaminants in the feedstock.…”

Section: Introductionmentioning

confidence: 99%

Comparison of the Accelerated and Spontaneous Deactivation of the HDS Catalyst

Jaklová¹,

Šindelářová²,

Kohout³

et al. 2021

Processes

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Owing to the increased use of secondary materials for diesel production, refineries must confront bad quality parameters. Therefore, catalysts with certain capabilities (to remove heteroatoms and improve quality parameters at low hydrogen consumption) and their lifetimes are required. An important parameter that influences the quality of the products and the economy of the unit is the activity of the catalyst. Prior to industrial use, the catalyst is typically tested in a pilot unit. This is necessary to obtain a considerable amount of data on the lifetime of the catalyst in the shortest feasible time. Here, deactivation steps were used to test the catalyst. Two experiments were performed to evaluate the effect of two types of accelerated deactivations on the catalyst activity and product properties. The first type of deactivation proceeded for 6 h and comprised a tripling of the amount of incoming feedstock, and the second type proceeded for 18 h without an increase in the amount of feedstock. For both cases, the pressure and hydrogen flow were minimised. Both types of accelerated deactivations had similar effects on the quality of the final products and catalyst. The only difference was in the duration of catalyst recovery after deactivation. The results were compared with those of a test in which the spontaneous deactivation of the catalyst was studied.

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