The Formation of High-boiling By-products in the Isomerization and Disproportionation of <I>m</I>-Xylene over a Silica-alumina Catalyst under Pressure
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概要
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Continuous liquid-phase isomerization and disproportionation reactions over silica-alumina catalysts were carried out using <I>m</I>-xylene with varying concentration of water. The reactions were conducted at 290°C and 400°C under a pressure of 300 kg/cm<SUP>2</SUP>. The results showed that the concentration of water required to attain a maximum activity for the isomerization was higher than that needed for the disproportionation reaction. The high-boiling by-products produced at 400°C comprized 2–5 per-cent of the weight of the total products, and the main component, polymethyldiphenylmethane, amounted to 70–80 per-cent of the by-products. The yield of polymethyldiphenylmethane was linearly correlated with that of toluene. This result appears to suggest that the disproportionation reaction and the polymethyldiphenylmethane formation proceed at a common active site and through the same intermediate.
- 公益社団法人 日本化学会の論文
著者
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Takaya Haruo
National Chemical Laboratory for Industry
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Todo Naoyuki
National Chemical Laboratory for Industry
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Minegishi Toshio
National Chemical Laboratory for Industry
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Oshio Hideki
The Research Laboratory, Central Glass Company, Ltd.
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Hosoya Tadasuke
National Chemical Laboratory for Industry
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