アミン被毒SiO_2-Al_2O_3触媒によるキシレンの選択メチル化

概要

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Xylenes were methylated with methanol on base-modified SiO_2-Al_2O_3 catalyst at 250° by the use of a gas-phase heterogeneous flow method. On commercially obtained SiO_2-Al_2O_3 trimethylbenzenes reached equillibrium composition at the reaction temperature among pseudocumene, hemimellitene, and mesitylene. In contrast, on ethylenediamine-modified SiO_2-al_2O_3,mesitylene was not observed in the methylation products. Pseudocumene and hemimellitene produced from ο-and m-xylene were in a molar ratio of 6 : 4,and pseudocumene was obtained exclusively from p-xylene. The selectivity on these catalysts was examined by acidic properties of the catalyst and the distribution of trimethylbenzene isomers. The acid site of H_0≦0.8 disappeared from the NH_3-modified catalyst which showed selective methylation.
公益社団法人日本薬学会の論文
1976-10-25