Chapter 10. Application of Zeolites in the Production of Light Olefins and BTX Petrochemical Intermediates

Martı́nez, Agustı́n; Arribas, María Adoración Merino; Moussa, Sara

doi:10.1039/9781788010610-00351

Cited by 5 publications

(7 citation statements)

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“…These multiaromatics derive from the C 16+ alkyl-bridged noncondensed alkyl aromatics formed at the clay tower when the olefin-containing C 8+ stream was alkylated (Figure 1). The presence of such compounds restricts the amount that may be blended into a gasoline pool as a result of the concomitant dark color, high density (0.9125 g/cm 3 ), and high final boiling point (FBP). Directing the stream containing the alkyl-bridged noncondensed alkyl multiaromatics to a gasoline pool does so at the expense of the gasoline quality.…”

Section: Resultsmentioning

confidence: 99%

“…The quality of the gasoline blending component can be significantly enhanced by fractionating the as-received stream at 180 °C. The resulting lighter fraction (41 wt %) circumvents the color and density issues, since this fraction is clear, possesses a RON value of 107, and has a lowered density of 0.8730 g/cm 3 . This simple process is of immediate value to the refinery with respect to the quality of the gasoline blending components now being significantly improved.…”

Section: Resultsmentioning

confidence: 99%

“…High-octane, aromatic-rich reformate is a major gasoline blending component that derives from catalytically reformed low-octane naphtha . This refining stream can be further processed in an aromatic complex unit downstream of the reformate complex to recover high-value aromatics, especially basic petrochemical intermediates such as benzene, toluene, and xylenes (BTX), which are industrially important reagents for production of other chemicals, e.g., terephthalate acid for polyester production. − …”

Section: Introductionmentioning

confidence: 99%

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Dearylation of Heavy Alkyl-Bridged Noncondensed Alkyl Diaromatics by Fluid Catalytic Cracking

Hodgkins

Koseoglu

Adam

2020

Ind. Eng. Chem. Res.

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The hydrodearylation process has previously demonstrated the ability to upgrade an aromatic reject stream from an aromatic recovery complex containing heavy alkyl-bridged noncondensed multiaromatics to high-value monoaromatics that include a benzene, toluene, and ethylbenzene/xylene (BTEX) yield of ∼6 wt %. Herein, a new alternative refining processing option is presented for the same reject stream that not only improves the quality of the gasoline blending component but also significantly increases the BTEX yield. The aromatic reject stream has a limited usage as a gasoline blending component because of its inferior quality. However, by fractionating the reject stream at 180 °C, the lighter fraction can be directly sent as a gasoline blending component with a high research octane number without negatively influencing the gasoline specification, and the heavier fraction can be dearylated by subjecting the stream to fluid catalytic cracking. Gas chromatography data show monoaromatic formation at the expense of diaromatic conversion and also present BTEX yields as a function of the processing conditions. Depending on the conditions employed, the BTEX yield in the liquid product can be significantly increased (∼37 wt %) compared with the previous configuration. The significant quantities of BTEX formed demonstrate that this new processing configurationin converting low-value aromaticsprovides alternative options to refineries to upgrade the aromatic reject stream.

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Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Dearylation of Heavy Alkyl-Bridged Noncondensed Alkyl Diaromatics by Fluid Catalytic Cracking

Hodgkins

Koseoglu

Adam

2020

Ind. Eng. Chem. Res.

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“…Zeolites have been widely used in many processes for the transformation of hydrocarbons. 45 − 47 These materials are considered the most important heterogeneous catalysts in the petrochemical industry. 48 , 49 Zeolites have a porous structure with well-defined pores and channel systems.…”

Section: Introductionmentioning

confidence: 99%

“…Zeolites have been widely used in many processes for the transformation of hydrocarbons. − These materials are considered the most important heterogeneous catalysts in the petrochemical industry. , Zeolites have a porous structure with well-defined pores and channel systems . These systems offer large void volumes that are able to host a wide variety of molecules while maintaining mechanical stability. , …”

Section: Introductionmentioning

confidence: 99%

Competitive Adsorption of Xylenes at Chemical Equilibrium in Zeolites

et al. 2021

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The separation of xylenes is one of the most important processes in the petrochemical industry. In this article, the competitive adsorption from a fluid-phase mixture of xylenes in zeolites is studied. Adsorption from both vapor and liquid phases is considered. Computations of adsorption of pure xylenes and a mixture of xylenes at chemical equilibrium in several zeolite types at 250 °C are performed by Monte Carlo simulations. It is observed that shape and size selectivity entropic effects are predominant for small one-dimensional systems. Entropic effects due to the efficient arrangement of xylenes become relevant for large one-dimensional systems. For zeolites with two intersecting channels, the selectivity is determined by a competition between enthalpic and entropic effects. Such effects are related to the orientation of the methyl groups of the xylenes. m -Xylene is preferentially adsorbed if xylenes fit tightly in the intersection of the channels. If the intersection is much larger than the adsorbed molecules, p -xylene is preferentially adsorbed. This study provides insight into how the zeolite topology can influence the competitive adsorption and selectivity of xylenes at reaction conditions. Different selectivities are observed when a vapor phase is adsorbed compared to the adsorption from a liquid phase. These insight have a direct impact on the design criteria for future applications of zeolites in the industry. MRE-type and AFI-type zeolites exclusively adsorb p -xylene and o -xylene from the mixture of xylenes in the liquid phase, respectively. These zeolite types show potential to be used as high-performing molecular sieves for xylene separation and catalysis.

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