Methylation of toluene
AssigneeMobil Oil Corporation
InventorsStephen Allan Butter, Warren William Kaeding
Life of this patent
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Abstract
Process for the methylation of toluene under conditions such that the formation of meta-xylene is suppressed and the formation of ortho and para-xylene is enhanced carried out in the presence of a catalyst comprising a crystalline aluminosilicate zeolite, said zeolite having a silica to alumina ratio of at least about 12 and a constraint index, as hereinafter defined, of from 1 to 12, said catalyst having been modified by the addition thereto of a Group VA element in an amount of at least 0.5 percent by weight.
Claims24
A process for the methylation of toluene such that the formation of meta-xylene is suppressed and the formation of at least one isomer selected from the group consisting of ortho- and para-xylene is enhanced which comprises contacting toluene with a methylating agent under methylation conditions in the presence of a catalyst comprising a crystalline aluminosilicate zeolite, said zeolite having a silica to alumina ratio of at least about 12, a constraint index within the approximate range of 1 to 12, said catalyst having been modified by the addition thereto of phosphorus, arsenic or antimony in an amount of at least 0.5 percent by weight.
Dependencies are inferred from the claim text.