Process for isomerizing xylene
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United States of America Patent
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Oct 13, 1987
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N/A
app pub date -
Dec 30, 1986
filing date -
Dec 30, 1986
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Abstract
A process for continuously isomerizing xylene, which comprises subjecting a hydrocarbon feed material comprising a major proportion of a xylene isomer mixture and a minor proportion of non-aromatic hydrocarbons to xylene isomerization reaction, isolating a specific xylene isomer from the resulting isomerization reaction mixture, and recycling the remaining hydrocarbon mixture to the xylene isomerization reaction; wherein the hydrocarbon feed material or the xylene isomerization reaction mixture is treated with hydrogen in the presence of a cracking catalyst comprising (a) a zeolite selected from zeolites ZSM-5, ZSM-11, ZSM-12, ZSM-34 and ZSM-48 series, at least 20% of its cation site being occupied by a cation of a metal selected from alkali metals and alkaline earth metals, and (b) a refractory amorphous inorganic oxide having platinum supported thereon, at a temperature and a weight hourly space velocity which simultaneously satisfy the following inequalities (i) to (iv) ##EQU1## wherein T represents the temperature (.degree.C.), and V represents the weight hourly space velocity (hr.sup.-1), thereby to crack the non-aromatic hydrocarbons in the hydrocarbon feed material or the xylene isomerization reaction mixture.
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