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Issue 54, 2017, Issue in Progress
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Improved performance of HZSM-5 for the ethylbenzene/xylene isomerization reaction under industrial operating conditions

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Abstract

A mild, specific one-step dealumination of ZSM-5 is reported for the first time that significantly increases para xylene selectivity and ethyl benzene conversion by disproportionation in the xylene isomerization reaction of xylene mixtures/ethyl benzene feeds under industrial conditions, i.e., 380 °C, 390 °C and 400 °C, at a pressure of 8 bar, weight hourly space velocity (WHSV) values of 2 to 8 h−1, and a H2/HC ratio of 4. Oxalic acid and ammonium hexafluorosilicate (AHFS) were used as dealuminating agents. Mild increases of the Si/Al molar ratio by one unit using oxalic acid or by 10 units using AHFS resulted in a more than 10% increase in para xylene when approaching equilibrium at 400 °C and WHSV = 2 h−1. However, the oxalic acid-treated sample increased ethylbenzene conversion by more than 30% with respect to the parent zeolite under the applied operating conditions. The AHFS-treated samples exhibited decreases in ethylbenzene conversion irrespective of the extent of dealumination.

Graphical abstract: Improved performance of HZSM-5 for the ethylbenzene/xylene isomerization reaction under industrial operating conditions

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Article information


Submitted
26 May 2017
Accepted
16 Jun 2017
First published
05 Jul 2017

This article is Open Access

RSC Adv., 2017,7, 34012-34022
Article type
Paper

Improved performance of HZSM-5 for the ethylbenzene/xylene isomerization reaction under industrial operating conditions

S. H. Farahani, S. M. Alavi and C. Falamaki, RSC Adv., 2017, 7, 34012
DOI: 10.1039/C7RA05924H

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