Influence of monovalent cations ion-exchange on zeolite ZSM-5 in separation of para-xylene from xylene mixture

被引：45

作者：

Rasouli, Milad ^{[2
]}

Yaghobi, Nakisa ^{[1
]}

Chitsazan, Sahar ^{[2
]}

Sayyar, Mohammad Hossein ^{[3
]}

机构：

[1] Iran Polymer & Petrochem Inst, Tehran, Iran

[2] Islamic Azad Univ, Fac Chem Engn, S Tehran Branch, Tehran, Iran

[3] Pooshesh Fan Avar Pars, Tehran, Iran

来源：

MICROPOROUS AND MESOPOROUS MATERIALS | 2012年 / 150卷 / 01期

关键词：

Adsorptive separation; ZSM-5; zeolite; Selectivity factor; C(8) aromatics; MEDIUM-PORE ZEOLITES; C-8; AROMATICS; P-XYLENE; ETHYLBENZENE; ADSORPTION;

D O I：

10.1016/j.micromeso.2011.09.013

中图分类号：

O69 [应用化学];

学科分类号：

081704 ;

摘要：

The adsorption behavior of para-xylene on H/ZSM-5 and also monovalent cations ion-exchanged ZSM-5 zeolite was investigated in liquid phase adsorption and breakthrough system. Nitrogen adsorption, X-ray diffraction, transmission electron microscopy (TEM) and also in situ Fourier transform infrared (FTIR) spectroscopy were also performed to characterize the adsorbents and study the type of adsorbed species and their thermal stabilities. The adsorption experiments were carried out at temperature of 130-170 degrees C and the pressure between 6 and 8 bar. Ion-exchange process was accomplished using metal cations such as lithium, sodium and potassium. H/ZSM-5 was found more efficient than other ion-exchanged ZSM5 zeolites in separation of para-xylene from its isomers. The isotherms for each isomer of C(8) aromatics and the desorbents possess the adsorption characteristics of Langmuir type. The selectivity factor of para-xylene and the saturation adsorption capacities of adsorbates were determined. A selectivity factor of para-xylene/meta-xylene, para-xylene/ortho-xylene and para-xylene/ethylbenzene on H/ZSM-5 adsorbent is determined as 24.987, 16.782 and 6.760, respectively. A series of desorbents matched with adsorbents like benzene, toluene, n-butylbenzene, p-diethylbenzene and p-dichlorobenzene were investigated as well. Influence of Si/Al ratio and the zeolite moisture content on selectivity of para-xylene to other C(8) aromatic isomers were also studied. (C) 2011 Elsevier Inc. All rights reserved.

引用

页码：47 / 54

页数：8

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