Pillararene‐Based Nanochannels for Para‐Xylene Separation from Xylene Isomers

2021 ◽  
Vol 6 (48) ◽  
pp. 13969-13974
Author(s):  
Fan Yi ◽  
Mingjie Tao ◽  
Siyun Zhang ◽  
Xiao‐Le Han ◽  
Xuehong Min
Keyword(s):  
Para Xylene ◽  
Xylene Isomers ◽  
Xylene Separation

Zeolitic para-xylene separation

Zeolites ◽  
1991 ◽  
Vol 11 (3) ◽  
pp. 300 ◽  
Author(s):  
H.A. Zinnen
Keyword(s):  
Para Xylene ◽  
Xylene Separation

scholarly journals The Effect of Contaminant on Xylene Separation by Zeolite Adsorption

1988 ◽  
Vol 5 (2) ◽  
pp. 116-126 ◽  
Author(s):  
S.M. Yih ◽  
H.C. Hsiao
Keyword(s):  
Adsorption Capacity ◽  
Molecular Sieve ◽  
Model Compound ◽  
Separation Processes ◽  
Xylene Isomers ◽  
Xylene Separation

Possible contaminants arising from the oxidation of xylene isomers are detrimental to industrial adsorptive xylene separation processes since they lower the selectivity and recovery of p-xylene. A model compound, acetophenone, has been used to simulate the contaminant and it has been shown via pulse tests to adsorb strongly on to a K-BaY zeolite, thereby lowering the selectivity of p-xylene. Although the liquid desorbent PDEB (p-diethylbenzene) was not effective in removing the adsorbed acetophenone, nitrogen at 400°C and 1 atm was effective both in removing the adsorbed acetophenone and regenerating the adsorbent. Measurements of the adsorption capacity of acetophenone have shown that Molecular Sieve 13 X and K-BaY zeolites are both good adsorbents for acetophenone.

scholarly journals Fluorescence-Based Detection of Benzene, Toluene, Ethylbenzene, Xylene, and Cumene (BTEXC) Compounds in Fuel-Contaminated Snow Environments

Chemosensors ◽  
2019 ◽  
Vol 7 (1) ◽  
pp. 5 ◽  
Author(s):  
Dana DiScenza ◽  
Lauren Intravaia ◽  
Anna Healy ◽  
Sage Dubrawski ◽  
Mindy Levine
Keyword(s):  
Rhode Island ◽  
Detection Method ◽  
Complex Environments ◽  
Linear Discriminant ◽  
Broad Applicability ◽  
Para Xylene ◽  
Benzene Toluene ◽  
Xylene Isomers ◽  
Fluorescence Modulation ◽  
Snow Samples

Reported herein is the sensitive and selective cyclodextrin-promoted fluorescence detection of benzene, toluene, ethylbenzene, xylene, and cumene (BTEXC) fuel components in contaminated snow samples collected from several locations in the state of Rhode Island. This detection method uses cyclodextrin as a supramolecular scaffold to promote analyte-specific, proximity-induced fluorescence modulation of a high-quantum-yield fluorophore, which leads to unique fluorescence responses for each cyclodextrin-analyte-fluorophore combination investigated and enables unique pattern identifiers for each analyte using linear discriminant analysis (LDA). This detection method operates with high levels of sensitivity (sub-micromolar detection limits), selectivity (100% differentiation between structurally similar compounds, such as ortho-, meta-, and para-xylene isomers), and broad applicability (for different snow samples with varying chemical composition, pH, and electrical conductivity). The high selectivity, sensitivity, and broad applicability of this method indicate significant potential in the development of practical detection devices for aromatic toxicants in complex environments.

scholarly journals Selective Formation of Para-Xylene by Methanol Aromatization over Phosphorous Modified ZSM-5 Zeolites

Catalysts ◽  
2020 ◽  
Vol 10 (5) ◽  
pp. 484
Author(s):  
Xianjun Niu ◽  
Kai Wang ◽  
Yang Bai ◽  
Yi-en Du ◽  
Yongqiang Chen ◽  
...  
Keyword(s):  
Micropore Volume ◽  
Acid Sites ◽  
Incipient Wetness Impregnation ◽  
Catalyst Structure ◽  
P Content ◽  
Para Xylene ◽  
Xylene Isomers ◽  
And Performance ◽  
The Relationship ◽  
Selective Formation

Phosphorous modified ZSM-5 zeolites were synthesized by incipient wetness impregnation. Their performances for the methanol to aromatics conversion (MTA) were subsequently evaluated and the relationship between the catalyst structure and performance was focused on. The obtained results indicated that the introduction of phosphorous resulted in the modification of the catalyst structure characteristics and acidic properties, i.e., the reduction in the external surface area and micropore volume, the narrowing of the pore size, and the decrease in the quantity and strength of acid sites. As a result, the P/HZSM-5 catalyst exhibited the enhanced selectivity for the para-xylene (PX) in xylene isomers and xylene in aromatics, and their increase degrees were intensified with the increasing P content. The selectivity of PX in X increased from 23.8% to nearly 90% when P content was 5 wt.%. Meanwhile, the selectivity of xylene in aromatics was enhanced from 41.3% to 60.2%.

scholarly journals Synthesis of highly active Cu(I)-Y(III)-Y zeolite and its selective adsorption desulfurization performance in presence of xylene isomers

2020 ◽  
Author(s):  
Bo-Long Jiang ◽  
Nan Jiang ◽  
You-Xin Chang
Keyword(s):  
Photoelectron Spectroscopy ◽  
Selective Adsorption ◽  
Sulfur Removal ◽  
X Ray Diffraction ◽  
X Ray ◽  
Highly Active ◽  
Adsorption Desulfurization ◽  
Para Xylene ◽  
Xylene Isomers ◽  
Fluorescence Spectrometer

Abstract Abstract A bimetal-exchanged NaY zeolite (Cu(I)-Y(III)-Y) with a desirable adsorptive desulfurization (ADS) performance was prepared and characterized by means of X-ray diffraction, specific surface area measurements, X-ray fluorescence spectrometer, X-ray photoelectron spectroscopy, thermal gravity analysis and Fourier transform infrared spectroscopy. The effect of Y(III) ions on ADS in the presence of the xylenes was investigated. Results indicated that the ADS performance of Y(III)-Y is higher than that of most reported CeY. The Y(III)-based Cu(I)-Y(III)-Y demonstrated the higher breakthrough loading than those of reported Ce(III)/Ce(IV)-based transition metal Y zeolites, showing that Y(III) ions play a promoting role in improving the ADS selectivity. For Cu(I)-Y(III)-Y, a new strong S-M interaction (S stands for sulfur, while M stands for metal) active site was formed, which might be caused by the synergistic effect between Cu(I) and Y(III). The Cu(I)-Y(III)-Y, which combined the advantages of Cu(I)-Y and Y(III)-Y, is a kind of promising adsorbent. The breakthrough loading decreased in the order of Cu(I)-Y(III)-Y > Y(III)-Y > Cu(I)-Y, and the effect of xylene isomers on the sulfur removal was in the order of ortho-xylene > meta-xylene > para-xylene, which exhibited the same trend with the bond order of xylenes.

Modeling and simulation of a simulated moving bed for adsorptive para-xylene separation

2010 ◽  
Vol 27 (2) ◽  
pp. 609-618 ◽  
Author(s):  
Jinsuk Lee ◽  
Nam Cheol Shin ◽  
Youngsub Lim ◽  
Chonghun Han
Keyword(s):  
Modeling And Simulation ◽  
Simulated Moving Bed ◽  
Moving Bed ◽  
Para Xylene ◽  
Xylene Separation

Influence of monovalent alkaline metal cations on binder-free nano-zeolite X in para-xylene separation

2015 ◽  
Vol 23 (1) ◽  
pp. 64-70 ◽  
Author(s):  
Milad Rasouli ◽  
Nakisa Yaghobi ◽  
Seyedeh Zahra Movassaghi Gilani ◽  
Hossein Atashi ◽  
Majid Rasouli
Keyword(s):  
Metal Cations ◽  
Alkaline Metal ◽  
Zeolite X ◽  
Para Xylene ◽  
Binder Free ◽  
Xylene Separation

Disproportionation of Toluene: Enhanced Para-Xylene Selectivity Over Modified HZSM-5

2013 ◽  
Vol 2 (2) ◽  
pp. 96-110
Author(s):  
Mohammad Ashraf Ali ◽  
Syed Ahmed Ali ◽  
Khalid Al-Nawad
Keyword(s):  
Para Xylene
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