Ethylbenzene/p-xylene

Benzene, toluene, ethylbenzene, p-xylene, m-xylene, oxylene 30 m CP CW57 CB column, 50-200° at 5°/min. 

Chen, H., Wagner, J. (1994c) Mutual solubilities of alkylbenzene + water systems at temperatures from 303 to 373 K Ethylbenzene, p-xylene, 1,3,5-trimethylbenzene, and n-butylbenezene. J. Chem. Eng. Data 39, 679-684. 

Adsorbent ethylbenzene p-xylene m-xylene p-xylene o-xylene m-xylene... 

Abstract Infrared spectroscopic methodsfor the measurement of adsorption and adsorption kinetics of some aromatics (benzene, ethylbenzene, p-xylene), pyridine, and paraffins in solid microporous materials such as zeolites (MOR, ZSM-5, silicalite-1) are described as well as the evaluation of the spectroscopically obtained data. The adsorption isotherms are of the Langmuir-Freundlich type. Isosteric heats of adsorption, transport diffusivities, and activation energies of diffusion as deduced from the spectroscopic measurements are compared with literature data as far as available, and they are found to be in reasonable agreement with results provided by independent techniques. Special attention is paid to sorption and sorption kinetics of binary mixtures, especially the problems of co- and counter-diffusion. ... 

As usual, spectral grade adsorbates (benzene, ethylbenzene, p-xylene, and pyridine) were employed (e.g., from Merck, Darmstadt, Germany). They must be further purified via distillation, passage through an alumina column to remove, particularly from ethylbenzene, contaminating oxygenates, subjected to three freeze-pump-thaw cycles and, finally, stored over highly (at 525 K under 10 Pa) activated 4A molecular sieves. These previously activated zeolite A samples were employed to remove even traces of water ampoules with... 

The IR technique also enables us to determine the adsorption and desorption of binary mixtures, provided the IR spectra of the two components were sufficiently different so that the spectra of the mixtures could be reliably decomposed. This was, e.g., the case for the pairs benzene/ethylbenzene, benzene/p-xylene, and ethylbenzene/p-xylene (compare, e.g.. Figs. 3 and 16). 

Even if a sequence of ordinary distillation columns is used, not all columns need give nearly pirre products. For example. Figure 7.10b shows a distillation sequence for the separation of a mixture of ethylbenzene, p-xylene, m-xylene, and o-xylene into only three products nearly pure ethylbenzene, a rrrixture of p- and m-xylene, and nearly pure o-xylene. The para and meta isomers are not separated because the normal boiling points of these two compounds differ by only 0.8°C, making separation by distillation impractical. 

An inspection of the industrial use of zeolites as catalysts shows, however, that only a rather limited number of zeolite topologies are currently used in major industrial processes. Among the more important ones are ultrastable Y (USY) (FAU), rare-earth-exchanged faujasite-type (X, Y) (FAU) andZSM-5-type (MFI) zeolites in fluid catalytic cracking (FCC) of oil fractions [4] noble-metal-loaded U SY for hydroisomerization and hydrocracking of naphtha feedstocks [5] mordenite (MOR) and zeolite Omega (MAZ) -based catalysts for C4-C6 alkane isomerization [6] zeolites ZSM-23 (MTT), ZSM-35 (FER), ZSM-5 for selective oil dewaxing [7] ZSM-5, silicalite (MFI), MCM-22 (MWW), Beta-type (BEA) zeolites for aromatics alkylation to yield ethylbenzene, p-xylene. 

Chianese, A. Marrdli, L. Isobaric vapor-liquid equilibria of the ethylbenzene - p-xylene system J. Chem. Eng. Data 1985,30, 424-427... 

Aromatic hydrocarbons (Figure 2), benzene, ethylbenzene, p-xylene, follow the first type of dependence, in agreement with the concept of their inclusion, while the... 

Since very large separation factors are obtained for arene/alkane mixtures, we also explored separations involving a variety of arene mixtures. The results shown in Table HI illustrate that differences in flux values do occur for some aromatic mixtures. Potentially useful separation factors were found for the separation of benzene from alkyl arenes such as toluene, ethylbenzene, and cumene. For isomeric mixtures such as ethylbenzene/p-xylene, m-xylene/o-xylene, and p-xylene/o-xylene, little differences in flux values are found for either Na+- or Ag+-exchanged membranes. 

Pure compounds for calibration shall include n-nonane (Note 1), toluene, styrene, ethylbenzene, p-xylene, m-xylene, o-xylene, isopropylbenzene, isooctane, (Note 2), n-octane (Note 2), -undecane (Note 2), of a purity not less than 99 %. If the purity of the calibration compounds is less than 99 %, the concentration and identification of impurities must be known so that the composition of the final weighed... 

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