Synthesis of Cumene by Transalkylation Over Modified Beta Zeolite: A Kinetic Study

Thakur, Ruchika; Barman, Sanghamitra; Gupta, Raj K.

doi:10.1590/0104-6632.20160334s20150333

Cited by 15 publications

(9 citation statements)

References 26 publications

(17 reference statements)

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“…The absorption band at around 805 cm -1 demonstrates internal bonds of the tetrahedral SiO 4 structural unit (Güleç et al 2016). Another band at around 1090 cm -1 indicates (Miao et al 2016;Thakur et al 2016;Shanjiao et al 2007) and the band at about 1212 cm -1 indicates external asymmetric stretching of T-O-T (Thakur et al 2016). The other wide band at about 3300-3600 cm -1 is associated with H bonded, O-H groups (Omegna et al 2004;Miao et al 2016;Sreedhar et al 2009;Toktarev et al 2010).…”

Section: Fourier Transform Infrared (Ftir) Analysismentioning

confidence: 96%

“…5. The FTIR spectrum contains a group of absorption bands where the peaks at around 520 and 465 cm -1 indicate the presence of fivemembered double rings, typical of beta zeolite and assigned to vibrations of T-O-T (T: Si or Al) siloxane bonds in the rings (Subsadsana et al 2016;Thakur et al 2016;Güleç et al 2016;Shanjiao et al 2007), respectively. The absorption band at around 805 cm -1 demonstrates internal bonds of the tetrahedral SiO 4 structural unit (Güleç et al 2016).…”

Section: Fourier Transform Infrared (Ftir) Analysismentioning

confidence: 99%

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Catalytic performance of Cu- and Zr-modified beta zeolite catalysts in the methylation of 2-methylnaphthalene

2018

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2,6-Dimethylnaphthalene (2,6-DMN) is a commercially important chemical for the production of polyethylenenaphthalate and polybutylene naphthalate. However, its complex synthesis procedure and high production cost significantly reduce the use of 2,6-DMN. In this study, the synthesis of 2,6-DMN was investigated with methylation of 2-methylnaphthalene (2-MN) over metal-loaded beta zeolite catalysts including beta zeolite, Cu-impregnated beta zeolite and Zr-impregnated beta zeolite. The experiments were performed in a fixed-bed reactor at atmospheric pressure under a nitrogen atmosphere. The reactor was operated at a temperature range of 400-500°C and varying weight hourly space velocity between 1 and 3 h -1 . The results demonstrated that 2,6-DMN can be synthesized by methylation of 2-MN over beta type zeolite catalysts. Besides 2,6-DMN, the product stream also contained other DMN isomers such as 2,7-DMN, 1,3-DMN, 1,2-DMN and 2,3-DMN. The activity and selectivity of beta zeolite catalyst were remarkably enhanced by Zr impregnation, whereas Cu modification of beta zeolite catalyst had an insignificant effect on its selectivity. The highest conversion of 2-MN reached 81%, the highest ratio of 2,6-DMN/2,7-DMN reached 2.6 and the highest selectivity of 2,6-DMN was found to be 20% by using Zr-modified beta zeolite catalyst.

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Section: Fourier Transform Infrared (Ftir) Analysismentioning

confidence: 96%

Section: Fourier Transform Infrared (Ftir) Analysismentioning

confidence: 99%

Catalytic performance of Cu- and Zr-modified beta zeolite catalysts in the methylation of 2-methylnaphthalene

2018

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“…Despite of the fact that dealkylation reactions are dominant in the catalytic cracking process, there are some secondary reactions related to isomerization, disproportionation, condensation and hydrogen transfer that affect the distribution of the products (Tsai et al 1999;Corma and Wojciechowski 1982;Thakur et al 2016). In that sense, coke formation is the result of several properties of the catalyst, mainly the density of the acidic sites in the catalyst (Fig.…”

Section: Catalytic Performance Of Samplesmentioning

confidence: 99%

Synthesis and catalytic behavior of FCC catalysts obtained from kaolin by the in-situ method

Padilla

Guzmán

Poveda-Jaramillo

2022

Braz. J. Chem. Eng.

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In-situ zeolites NaY and Na[B]Y were synthesized on microspherical matrices of kaolin to obtain FCC catalysts. An alkaline pretreatment of the matrix was investigated in order to evaluate its effect on matrix properties and crystallization of the in-situ synthetized zeolites. Catalysts were characterized by SEM, TEM, Ar adsorption, XRD and NH3-TPD. It was observed an increase in the surface area and mesoporosity of the alkaline treated catalysts either synthetized with the presence of boron or with no boron in the hydrothermal reaction mixture. Ammonia TPD analyses have shown an increase in the amount and strength of the acidity of the catalysis with the zeolites crystallized on the pretreated matrices and exchanged with lanthanum ions. Thus, a combination between higher concentration of stronger acid sites and higher proportion of mesoporous generated in the matrices treated with alkaline solution had resulted in more active catalyst as shown by the triisopropylbenzene cracking experiments conducted here. Graphical abstract

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“…It is usually obtained in the industry by alkylation of benzene with propylene over an acidic catalyst to produce cumene [2]. Transalkylation is also often integrated for cumene production to eliminate unwanted side products such as p-diisopropyl benzene, thus increasing the selectivity of cumene [3]. The overall growth rate for cumene capacity between 2000 and 2017 has been healthy, averaging slightly less than 3.5 % per year to reach about 18 million metric tons per year in 2017 [4].…”

Section: Introductionmentioning

confidence: 99%

Process Simulation & Sensitvity Analysis of Cumene Production from an Integrated Alkylation and Transalkylation Reaction

Hazmi¹

2022

JCPE

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Cumene is a very important petrochemical commodity, mainly to produce phenol and acetone. The overall growth rate for cumene capacity has been healthy, averaging slightly less than 3.5 % per year to reach 18 million metric tons per year in 2017. The purpose of this study is to generate a steady-state process simulation using ASPEN HYSYS version 10 to produce a small capacity of 10 ton/h of cumene with 99.99 wt % product purity. An alkylation reaction of benzene with propylene is carried out for producing cumene by using a zeolites catalyst as modeled by Badger technology. Transalkylation is also integrated into the system for eliminating unwanted products such as p-diisopropyl benzene. The proposed simulation flowsheet provides a good convergence overall result. The preliminary utility consumption obtained from the simulation consists of approximately 0.0418 kton/h of steam, 1.22 kton/h of cooling water, and 450 kW of electrical duty. Optimization is carried out in the simulation by conducting a sensitivity analysis study to find the optimum operating conditions of the alkylation reactor with a dimension of 1.3 m diameter and 4 m of length. The result shows that at an optimum value of B/P molar ratio of 7, reactant temperature of 170 oC, and reactant pressure of 3 MPa, the selectivity of cumene obtained is at a high value of 0.9446, while the percentage conversion of propylene to cumene obtained is at a high value of 99.99 %.

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Synthesis of Cumene by Transalkylation Over Modified Beta Zeolite: A Kinetic Study

Cited by 15 publications

References 26 publications

Catalytic performance of Cu- and Zr-modified beta zeolite catalysts in the methylation of 2-methylnaphthalene

Catalytic performance of Cu- and Zr-modified beta zeolite catalysts in the methylation of 2-methylnaphthalene

Synthesis and catalytic behavior of FCC catalysts obtained from kaolin by the in-situ method

Process Simulation & Sensitvity Analysis of Cumene Production from an Integrated Alkylation and Transalkylation Reaction

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