Xylene isomerization using zeolites in a gradientless reactor system

AIChE Journal ◽  
1987 ◽  
Vol 33 (8) ◽  
pp. 1233-1240 ◽  
Author(s):  
Y. H. Ma ◽  
L. A. Savage
Keyword(s):  
Reactor System ◽  
Xylene Isomerization ◽  
Gradientless Reactor

Aromatic Transformation in Fluidized Bed Reactors

2008 ◽  
Vol 73 (8-9) ◽  
pp. 1061-1088
Author(s):  
Sule Rabiu ◽  
Sulaiman Al-Khattaf
Keyword(s):  
Fluidized Bed ◽  
The Other ◽  
Fluidized Bed Reactors ◽  
Y Zeolite ◽  
Y Zeolites ◽  
Toluene Disproportionation ◽  
Xylene Isomerization ◽  
Toluene Methylation ◽  
Toluene Conversion ◽  
Medium Acidity

In this work three important aromatic transformations, namely: toluene disproportionation, toluene methylation and m-xylene isomerization, were investigated in a riser simulator which closely mimics the operation of commercial fluidized bed reactors. The transformations were studied over a ZSM-5 based catalyst with medium acidity of 0.23 mmol/g and a series of Y zeolites of acidities between 0.55 and 0.03 mmol/g. For pure toluene feed, it was observed that conversion over the ZSM-5 based catalyst and the weakly acidic Y zeolite (USY-1) was very low. However, with the highly acidic Y zeolite (H-Y), significant toluene conversion was observed with paring reaction more prominent than disproportionation. On the other hand, when toluene was alkylated with methanol, higher toluene conversions were achieved over both the ZSM-5 based and the weakly acidic USY-1 catalysts as compared to when pure toluene feed was used. In addition, p-xylene/o-xylene (P/O) ratios higher than the equilibrium values were obtained in the reaction product over both catalysts. Finally, for m-xylene isomerization it was found that m-xylene conversion increased initially as the acidity of the catalyst increased up to 0.1 mmol/g beyond which any further increase in acidity resulted in a slight decrease in the m-xylene conversion.

scholarly journals A versatile ceramic capillary membrane reactor system for continuous enzyme‐catalyzed hydrolysis

2021 ◽  
Author(s):  
Lorn Messner ◽  
Marieke H. Antink ◽  
Tongwei Guo ◽  
Michael Maas ◽  
Sascha Beutel
Keyword(s):  
Membrane Reactor ◽  
Reactor System ◽  
Capillary Membrane

Autoheated thermophilic aerobic sludge digestion and metal bioleaching in a two-stage reactor system

2010 ◽  
Vol 22 (2) ◽  
pp. 230-236 ◽  
Author(s):  
Rohan Jain ◽  
Ashish Pathak ◽  
T.R. Sreekrishnan ◽  
M.G. Dastidar
Keyword(s):  
Reactor System ◽  
Two Stage ◽  
Sludge Digestion ◽  
Aerobic Sludge
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