| 摘要 |
1275953 Disproportionation catalysts comprising mordenite TORAY INDUSTRIES Inc 23 May 1969 [27 May 1968] 26591/69 Heading B1E [Also in Division C5] At least a major part of a catalyst for use in the preparation of benzene and xylene by disproportionating toluene consists of natural mordenite or a mixture of natural mordenite and synthetic mordenite, at least 45 weight per cent of the mixture being natural mordenite, at least 60 weight per cent of the aforesaid major part of the catalyst being material having the mordenite structure and at least 50 mole per cent of the material having the mordenite structure being in the hydrogen form. The catalyst also may contain material selected from aluminium fluoride, copper and silver; use of catalysts which comprise natural mordenite and aluminium fluoride but which do not also comprise synthetic mordenite is disclaimed. The catalyst may be in the form of moulded bodies prepared by extruding or tabletting, optionally in the presence of a lubricating agent, for example aluminium stearate, graphite, starch, polyacrylic acid, mineral oil or vegetable oil. The specification contains many examples which relate to catalysts consisting solely of mixtures of natural mordenite and synthetic mordenite; comparative examples relate to catalysts consisting of mixtures of hydrogen-form natural mordenite and hydrogen-form synthetic mordenite, of which mixtures less than 45 weight per cent is natural mordenite and/or less than 60 weight per cent is material having the mordenite structure (Examples 1 and 3) and mixtures of hydrogen-form synthetic mordenite and either alumina (Examples 1, 2 and 4) or kaolin (Examples 1 and 4) or silica (Examples 1 and 5). Reference is made to Specifications 1,067.461 1,251,388 and 1,254,463. |
