A novel fluid catalytic cracking approach for producing low aromatic LCO

Gilbert, William R.; Morgado, E.; Abreu, Marco A.S. de; Puente, Gabriela de la; Passamonti, Francisco Javier; Sedrán, Ulises

doi:10.1016/j.fuproc.2011.07.006

Cited by 24 publications

(14 citation statements)

References 10 publications

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“…It has been reported that C 15 H 22 can be easily formed by the effect of temperature [23,32]. Since both the matrix and the binder in the catalysts are silica, their activity can be assumed to be contributed by the zeolite component only [4,10,33]. Figure 4 shows the conversion profiles observed over the four catalysts at 500°C, where it can be seen that the catalysts with desilicated zeolites all showed to be more active than the one with the parent zeolite Cat-00.…”

Section: 35-tri-isopropylbenzene Cracking At 500°cmentioning

confidence: 99%

Impact of the Desilication Treatment of Y Zeolite on the Catalytic Cracking of Bulky Hydrocarbon Molecules

2015

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Mesoporosity was induced on a USY zeolite by means of an alkaline leaching process. Samples were immersed in 0.05, 0.10 and 0.20 M NaOH solutions during 15 min at room temperature and then were exchanged with NH 4? ions and calcined to yield the acid forms. The formation of mesopores with size ranging from 20 to 100 Å increased with the concentration of NaOH. The modified zeolites were used at 30 wt% to formulate cracking catalysts with an inert SiO 2 matrix. The catalytic performance of these catalysts in the conversion of 1,3,5-tri-isopropylbenzene was evaluated in a batch, fluidized bed reactor at 450, 500 and 530°C, with a catalyst to oil relationship of 4.7 and contact times up to 16 s. The catalysts with the modified zeolites were more active in the cracking of these bulky molecules than the one with the parent, unmodified zeolite; moreover, the selectivity to the products of primary cracking reactions increased. These results reveal an enhanced diffusion of the reactant molecules to the zeolite active sites and of the products out of the catalyst particles.

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Section: 35-tri-isopropylbenzene Cracking At 500°cmentioning

confidence: 99%

Impact of the Desilication Treatment of Y Zeolite on the Catalytic Cracking of Bulky Hydrocarbon Molecules

2015

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“…This may adversely affect the quality of fuels; for example, making the content of aromatic hydrocarbons in LCO very large (typically between 50 and 70%), 4 a fact which induces a very low cetane index of about 24-28. 6,7 Then, if specific catalysts are to be developed to decrease the selectivity to aromatic hydrocarbons in middle distillate cuts, it is necessary to know the mechanisms controlling the formation of these compounds in the cut, and the contribution to the group from the various components in the feedstocks. However, the versatility of the FCC in processing different low quality, high molecular weight oil fractions opens to new chances of improving fuel quality and yield by means of new catalysts producing less aromatics.…”

Section: Introductionmentioning

confidence: 99%

Catalytic Cracking of Heavy Aromatics and Polycyclic Aromatic Hydrocarbons over Fluidized Catalytic Cracking Catalysts

2015

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The distribution of products in the range of gasoline and middle distillates cuts obtained in the catalytic cracking of heavy aromatics and polycyclic aromatic hydrocarbons over a FCC catalyst was studied. 1-Phenyloctane, biphenyl, fluorene, 9,10-dihydrophenanthrene, naphthalene, phenanthrene, pyrene and benz [a]anthracene were used as model compounds of alkylaromatic, naphthenic-aromatic and polyaromatic hydrocarbons which are present in VGO and residual feedstocks in the FCC process. The catalyst was used in its fresh and equilibrium forms at 450 ºC in a CREC Riser Simulator reactor with reaction times from 2 to 6 s. Thermal cracking reactions overwhelm the catalytic conversion of naphthenic-aromatic compounds such as fluorene and 9,10-dihydrophenanthrene. Under the same conditions, the fresh catalyst was more active than the equilibrium catalyst. The alkylaromatic, naphthenicaromatic and polyaromatic hydrocarbons, showed catalytic conversions which increased, CORRESPONDING AUTOR *were relatively stable and decreased, respectively, as a function of reaction time. The distribution of products suggested that most important reactions were thermal dehydrogenation, hydrogen transfer, ring opening, cracking and condensation. It was shown that all the model compounds are cracked, yielding particularly benzene in the gasoline range and coke.

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“…Even though technological options exist which can lead to upgrading the quality of LCO, such as partial hydrogenation of aromatics and ring opening of naphthenic compounds [6], these may be expensive. However, the versatility of the FCC in processing different types of feedstocks offers opportunities to improve LCO yield and quality by either modifying operative conditions [7] or using new catalysts which would produce less aromatics [8,9].…”

Section: Introductionmentioning

confidence: 99%