Prediction of the total lifetime of the catalytic reforming catalyst for Isfahan refinery using test run data
Subject Areas :
1 - Catalysis Research Center, Research Institute of Petroleum Industry, Tehran, Iran
Keywords: Catalytic reforming process, Deactivation of the reforming catalyst, Coke deposition, Prediction of the final lifetime of catalyst, Test run data,
Abstract :
Catalytic reforming catalysts in petroleum refineries and petrochemical complexes decline their activities due to coke formation on the pores of the catalysts with time on stream. Finally, after several cycles of regeneration and operation, the catalyst has to be replaced. In this research, an irreversible reaction of increasing the octane number of the reforming reactor product was modeled. Also, the rate of deactivation was considered as a power law function. The rate constants of both main reaction and deactivation were assumed to be Arrhenius functions of temperature. The data of the test runs of Isfahan refinery for four cycles were collected. After estimating the parameters of the model, comparing the analysis of variance table, and also comparing the octane number of the test runs against the octane number predicted by the model, the accuracy of the modeling results and their matching with the test run data were proved. The average absolute deviation of octane numbers for all 62 test runs was equal to 0.856. Different scenarios to determine the final operating life of the reforming catalyst were obtained using modeling results. Therefore, by considering the minimum acceptable research octane number at EOR temperature to be equal to 89, this catalyst can work for 8134 days, which is almost equal to 22.3 years. If the minimum acceptable research octane number was to be 88, the life of the catalyst would increase to around 30 years. In addition, the family curves of activity and research octane number at constant temperatures with respect to time on stream were developed for catalytic reforming catalyst
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