Toluene disproportionation over zeolite catalyst
AssigneeMobil Oil Corporation
InventorRoger A. Morrison
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Abstract
A process is provided for disproportionation of toluene in a reaction zone maintained under conditions such that said disproportionation is accomplished in the vapor-phase, with a hydrogen/hydrocarbon mole ratio of from 0 to 4, and in the presence of a catalyst comprising a crystalline aluminosilicate zeolite characterized by a silica/alumina mole ratio of at least 12 and a constraint index, hereinafter defined, within the approximate range of 1 to 12, said catalyst under said conditions being capable of long stability and of affording a high yield of disproportionation products with favorable selectivity toward para-xylene.
Claims23
A process for effecting vapor-phase disproportionation of toluene which comprises contacting toluene with a catalyst composition comprising a crystalline aluminosilicate zeolite characterized by a silica/alumina mole ratio of greater than 12 and a constraint index within the approximate range of 1 to 12 and containing cations which are predominately hydrogen, hydrogen precursor and/or a non-noble metal of Group VIII of the Periodic Table of Elements, said toluene having been dried prior to said contacting, under conditions effective for accomplishing said vapor-phase disproportionation including a reactor inlet temperature between about 650.degree. F and about 1100.degree. F, a hydrogen to hydrocarbon mole ratio of between 0 and about 4, a reactor pressure between atmospheric and about 1000 psig and a weight hourly space velocity of between about 1 and about 20, whereby from about 40 to about 50 weight percent of said toluene is disproportionated and the approach to equilibrium for para-xylene in the process is greater than 100%.
Dependencies are inferred from the claim text.