A review of advances in production and separation of xylene isomers

Shi, Qian; Gonçalves, Jonathan C.; Ferreira, Alexandre F. P.; Rodrigues, Alírio E.

doi:10.1016/j.cep.2021.108603

Cited by 45 publications

(17 citation statements)

References 83 publications

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“…Accordingly, the pseudo-equilibrium ideal sorption capacity ratio of PX and OX is about 16, which is greater than that (3-5) of faujasite-type zeolites used in industrial SMB processes. 2 The high selectivity of PX over OX exhibited in Zn(purine)I coupled with the low overall uptake is consistent with the conclusions drawn in a recent computational prediction of xylene separation that high PX selectivity is typically accompanied with low PX uptake capacity. 30 In addition, the similar PXRD patterns of Zn(purine)I powder loaded with xylene vapors (Fig.…”

supporting

confidence: 88%

“…Industrially, xylene isomers are predominantly separated through simulated moving bed (SMB) processes, which are adsorption-based processes operating at high temperature (B180 1C) and pressure (B9 bar). 1,2 Typical sorbents for these processes are cation-exchange faujasite zeolites that exhibit excellent thermal and chemical stability, but have low xylene saturation capacity (0.8-1.8 mmol g À1 ) and p-xylene (PX) selectivity (smaller than 6). 1,3 New adsorbent candidates with either higher xylene uptake capacity or sorption selectivity have the potential to enable next-generation SMB.…”

mentioning

confidence: 99%

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Unblocking a rigid purine MOF for kinetic separation of xylenes

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confidence: 88%

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confidence: 99%

Unblocking a rigid purine MOF for kinetic separation of xylenes

et al. 2022

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“…C 8 aromatics are crucial fundamental organic raw materials for the production of high-value poly(ethylene terephthalate) ionomer (PETI), which mainly consist of o -xylene, m -xylene, p -xylene, and ethylbenzene. , As the ethylbenzene in C 8 aromatics has a negative effect on the oxidation of m -xylene and p -xylene for PETI production, it is significant to separate the ethylbenzene from C 8 aromatic hydrocarbons . Besides, the obtained ethylbenzene can also be used as the primary raw material to produce high-value styrene.…”

Section: Introductionmentioning

confidence: 99%

“…1,2 As the ethylbenzene in C 8 aromatics has a negative effect on the oxidation of m-xylene and p-xylene for PETI production, it is significant to separate the ethylbenzene from C 8 aromatic hydrocarbons. 3 Besides, the obtained ethylbenzene can also be used as the primary raw material to produce high-value styrene. However, using the ordinary distillation process to obtain ethylbenzene with high purity from C 8 aromatics requires many equilibrium stages since the relative volatility of ethylbenzene and m-xylene or p-xylene is close to 1, which causes high capital expenditure.…”

Section: ■ Introductionmentioning

confidence: 99%

Investigation on the Isobaric Vapor–Liquid Equilibrium for the Binary Systems of Ethyl Benzoate with Xylene Isomers and Ethylbenzene

et al. 2021

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Isobaric binary vapor−liquid equilibrium (VLE) data for ethylbenzene + ethyl benzoate, o-xylene + ethyl benzoate, m-xylene + ethyl benzoate, and p-xylene + ethyl benzoate, as well as the quinary VLE data for ethyl benzoate + o-xylene + mxylene + p-xylene + ethylbenzene, were measured at 101.33 kPa using a modified Rose still. The thermodynamic consistency test was implemented by using the Herington method. Moreover, the VLE data for ethyl benzoate + o-xylene, ethyl benzoate + mxylene, ethyl benzoate + p-xylene, and ethyl benzoate + ethylbenzene were correlated using the nonrandom two-liquid (NRTL) and universal quasichemical activity coefficient (UNIQUAC) models using the nonlinear least-square method. The obtained NRTL and UNIQUAC model parameters of the binary systems were utilized to predict the VLE data for the quinary system. It was shown that all the models showed a relatively small deviation from the experimental results, and the quinary predicted values obtained in this way agreed well with the experimental values, indicating that the experimental data were suitable for designing the extractive distillation process of ethyl benzoate with ethylbenzene and xylene isomers.

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“…Moreover, each of these chemicals is utilized for petrochemical applications for which there are no currently viable replacements or cost-effective substitutions. For example, p -xylene is a chemical precursor of polyethylene terephthalate (PET) that cannot be replaced by either m - or o -xylene. , Isomer-specific detection is an important process-control capability for a number of industrial chemical separations, a family of processes that amounts to approximately 15% of total global energy consumption. , …”

mentioning

confidence: 99%

Identification and Quantitation of Aqueous Single- and Multianalyte Solutions of the Isomers Ethylbenzene, m-, p-, and o-Xylene Using a Single Specifically Tailored Sensor Coating and Estimation Theory-Based Signal Processing

et al. 2022

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The isomer-specific detection and quantitation of m-, p-, and o-xylene and ethylbenzene, dissolved singly and as mixtures in aqueous solutions at concentrations from 100 to 1200 ppb by volume, is reported for a specifically designed polymerplasticizer coating on a shear-horizontal surface acoustic wave (SH-SAW) device. The polystyrene-ditridecyl phthalate-blend coating was designed utilizing Hansen solubility parameters and considering the dipole moment and polarizability of the analytical targets and coating components to optimize the affinity of the sensor coating for the four chemical isomers. The two key coating sorption properties, sensitivity and response time constant, are determined by the (slightly different) dipole moments and polarizabilities of the four target analytes: as analyte dipole moment decreases, coating sensitivity increases; as analyte polarizability decreases, coating response time lengthens. Using the measured sensitivities and time constants for the targets, sensor signals were processed with exponentially weighted recursive-least-squares estimation (EW-RLSE) to identify (with near 100% accuracy) and quantify (with ± 5−7% accuracy) the isomers. This impressive performance was achieved by combining the specifically tailored, high-sensitivity coating and an SH-SAW platform (yielding a detection limit of 5 ppb for the analytes) and using the EW-RLS estimator, which estimates unknown parameters accurately even in the presence of measurement noise and for analytes with only minor differences in response. Identification of the xylene isomers is important for applications including environmental monitoring and chemical manufacturing.

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A review of advances in production and separation of xylene isomers

Cited by 45 publications

References 83 publications

Unblocking a rigid purine MOF for kinetic separation of xylenes

Unblocking a rigid purine MOF for kinetic separation of xylenes

Investigation on the Isobaric Vapor–Liquid Equilibrium for the Binary Systems of Ethyl Benzoate with Xylene Isomers and Ethylbenzene

Identification and Quantitation of Aqueous Single- and Multianalyte Solutions of the Isomers Ethylbenzene, m-, p-, and o-Xylene Using a Single Specifically Tailored Sensor Coating and Estimation Theory-Based Signal Processing

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