A novel process for methanol alkylation of toluene to produce xylene

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" A novel process for methanol alkylation of toluene to produce xylene "
Sule Rabiu

Document Type	:	Latin Dissertation
Language of Document	:	English
Record Number	:	53943
Doc. No	:	TL23897
Call number	:	‭1452648‬
Main Entry	:	Sule Rabiu
Title & Author	:	A novel process for methanol alkylation of toluene to produce xylene\ Sule Rabiu
College	:	King Fahd University of Petroleum and Minerals (Saudi Arabia)
Date	:	2008
Degree	:	M.S.
student score	:	2008
Page No	:	132
Abstract	:	A novel fluidized bed process for the production of xylene from toluene methylation over zeolite based catalysts was investigated. Experimental runs were carried out in a novel bench scale riser simulator at 375,400,425 and 450°C for reaction times of 3,5,7,10,13 and 15 sec. Two different catalysts based on Y and ZSM-5 zeolites were used. Over both catalysts, toluene conversion was found to increase with temperature reaching a value of 12.1%) and 16.81% at 450°C for the Y-and ZSM-5 based catalysts respectively. Further more, the use of short contact times greatly suppressed undesirable secondary para-xylene isomerization leading to para -xytene/ortho-xylene (P/O) ratios much higher than the equilibrium value. Partial deactivation of the external acid sites of the ZSM-5 based catalyst with coke deposit from 1, 3, 5-triisopropyl benzene (TIBP) was found to have a significant positive effect on the P/O ratio in the reaction product. The experimental results were modeled based on the Time-On-Stream model and the activation energies of toluene methylation were found to be 43.18 kJ/mol and 67.79kJ/mol over the Y-and ZSM-5 based catalysts respectively.
Subject	:	Applied sciences; Chemical engineering; 0542:Chemical engineering
Added Entry	:	King Fahd University of Petroleum and Minerals (Saudi Arabia)