Characteristics of catalytic reforming with continuous regeneration of the catalyst

Abstract

The results of a pilot run of the LF-35/21-1000 reforming unit with continuous regeneration of the catalyst at LUKOIL -Nizhegorodnefteorgsintez Co. are reported. It was found that all of the blocks and units operate in accordance with the project requirements. Dependences that correlate the quality of reforming naphtha with its yield and the yield of hydrogen-containing gas and power consumption with the output of the unit were obtained.Catalytic reforming naphtha occupies a leading position (52.8 vol. %) in Russia's gasoline stock (more than 30 million tons/year) [1]. This is due to catalytic reforming units with periodic catalyst regeneration, the base for production of high-octane components of unleaded automotive gasolines, as well as catalytic cracking naphthas, in all large oil refineries [2,3]. The proportion of catalytic reforming and cracking naphthas is decreasing significantly in high-quality gasolines due to stiffening of the requirements for the content of benzene (less than 1 vol. %), aromatics (less than 35 vol. %), and olefins (less than 5 vol. %) [4].The universal introduction of catalytic reforming in oil refinery (OR) manufacturing schemes is also due to the fact that hydrogen-containing gas (HCG) is the second target product of this process. The concentration of hydrogen in HCG is 75-93% as a function of modification of the process. Production of environmentally clean jet and diesel fuels is directly correlated with the presence of industrial hydrogen in the refineries, i.e., catalytic reforming units [5].The basic trends in improving catalytic reforming are:the efficiency of the catalysts; 363 • • • • • revamping and retooling the units with a stationary bed of catalyst with a step with continuous regeneration of the catalyst; • • • • • introducing units with continuous regeneration of the catalyst; • • • • • improving process and heat-and mass-exchange equipment [6]. In 2004, LUKOIL -Nizhegorodnefteorgsintez Co. completed construction of the LF-35/21-1000 unit based on Platforming CCR UOP technology at a pressure of 0.35 MPa under a medium-term program for re-equipping and developing production.After completion of construction and starting the unit up, studies were conducted to determine the optimum composition of the feedstock and target product, power consumption and real consumption of material and technical resources, to establish the correspondence of the real operating parameters with the rated parameters, to optimize operation of control systems, and to determine the cycle between repairs based on the results of operating compressor equipment in the different operating conditions of the unit.The studies of the feedstock hydrotreating block were conducted for 138 days, the reforming block was investigated for 132 days, and the catalyst regeneration block was studied for 95 days. The feedstock load varied from 67 to 120 tons/h, and the catalyst circulation rate varied from 400 to 715 kg/h. The unit operated in six regimes.The basic indexes of operation of the hydrotreating block are rep...

Optimization Approach for Continuous Catalytic Regenerative Reformer Processes

“…The simulation results delivered by our model are compared to values for the Universal Oil Products (UOP) CCR pilot plant reported by Rassadin et al 27 The obtained simulation operating indices are in good agreement with the reported information reported in Table 3. Solutions for the other process variables obtained by the CCR model simulation are presented in Table 4.…”

“…The catalyst is progressively coked as it moves through the reactors. The catalyst leaving each reactor enters the next one, and the total residence time of the catalyst in the system typically ranges between 2 and 7 days. , The catalyst leaving the last reactor is sent to the continuous catalyst regeneration units. The coked catalyst undergoes a sequence of steps involving controlled coke combustion, oxychlorination, and calcinations to restore catalyst activity and metal redispersion.…”

Modeling and energy optimization of the catalytic naphtha reforming process

“…Nakon pronalaženja minimuma "Random Walk" metodom, a s obzirom da ona ne daje egzaktnu Rezultati dobijeni simulacijom modela za kontinualno-regenerativni proces upoređeni su sa vrednostima za kontinualno-regenerativno pilot postrojenja [101] (Tabela 4.3).…”

“…Upoređivanjem vrednosti operativnih indeksa dobijenih simulacijom i eksperimentalnih vrednosti [101], može se zaključiti da se rezultati simulacije dobro slažu sa eksperimentalnim. Vrednosti ostalih procesnih veličina dobijenih simulacijom, prikazani su u Tabeli 4.4.…”