The Selective Methylation of Xylenes on SiO2-Al2O3 Modified with Various Amines

Xylenes were methylated with methanol on base-modified SiO2-Al2O3 catalyst at 250° by the use of a gas-phase heterogeneous flow method. On commercially obtained SiO2-Al2O3 trimethylbenzenes reached equillibrium composition at the reaction temperature among pseudocumene, hemimellitene, and mesitylene...

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Bibliographic Details
Published inYAKUGAKU ZASSHI Vol. 96; no. 10; pp. 1255 - 1258
Main Authors INOUE, MASAMI, ENOMOTO, SABURO, TODA, SHUSHIRO
Format Journal Article
LanguageJapanese
Published Japan The Pharmaceutical Society of Japan 01.10.1976
Subjects
Aluminum Silicates
Amines
Methylation
Xylenes
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Summary:Xylenes were methylated with methanol on base-modified SiO2-Al2O3 catalyst at 250° by the use of a gas-phase heterogeneous flow method. On commercially obtained SiO2-Al2O3 trimethylbenzenes reached equillibrium composition at the reaction temperature among pseudocumene, hemimellitene, and mesitylene. In contrast, on ethylenediamine-modified SiO2-al2O3, 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 H0≤0.8 disappeared from the NH3-modified catalyst which showed selective methylation.
Bibliography:ObjectType-Article-2
SourceType-Scholarly Journals-1
ObjectType-Feature-1
content type line 23
ISSN:0031-6903
1347-5231
DOI:10.1248/yakushi1947.96.10_1255