Cleaning Effects of the Reactant in the Liquid-phase Isomerization of <I>m</I>-Xylene over a Silica-Alumina Catalyst under Pressure

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概要

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• The activity of silica-alumina catalyst in the isomerization of <I>m</I>-xylene was measured at the temperatures of 290°C, 320°C, 380°C, and 430°C in the liquid phase under a pressure of 300 kg/cm<SUP>2</SUP>. The observed activities were considerably higher than those in vapor-phase reactions, moreover even after 20 days practically no decline in the activity was observed except for the measurements at 430°C. This superior ability of the catalyst in the liquid phase can be ascribed to the cleaning effect of the liquid reactant: in the liquid-phase reaction the high-boiling by-product, which, in vapor-phase reactions, diminishes the activity because of its strong adsorptivity on the surface sites, is successively dissolved in the reactant; therefore, more surface sites are constantly available for the isomerization. This interpretation was substantiated by the following results: 1) when the reaction was operated in the liquid phase, about eighteen times as much high-boiling by-product was obtained as in the vapor phase; 2) the activity in the liquid-phase reaction was much higher than that in the vapor phase; 3) the decreased activity caused by the interruption of the flow was regenerable when the flow was resumed; 4) the addition of the high-boiling by-product to the reactant <I>m</I>-xylene resulted in a considerable decrease in the activity. In addition, the identification of the components in the high-boiling by-products was carried out by means of mass and NMR spectroscopic studies.

• 公益社団法人 日本化学会の論文

著者

• Takaya Haruo

  The Government Chemical Industrial Research Institute

• Todo Naoyuki

  The Government Chemical Industrial Research Institute

• Todo Naoyuki

  The Government Chemical Industrial Research Institute, Tokyo

• Minegishi Toshio

  The Government Chemical Industrial Research Institute, Tokyo

• Hosoya Tadasuke

  The Government Chemical Industrial Research Institute, Tokyo

• Yoneoka Mikio

  Japan Gas-Chemical Company, Inc., Niigata Laboratory

• Oshio Hideki

  The Research Laboratory, Central Glass Company, Ltd.

• Yoneoka Mikio

  Japan Gas-Chemical Company Inc., Niigata Laboratory

• Hosoya Tadasuke

  The Government Chemical Industrial Research Institute

• Minegishi Toshio

  The Government Chemical Industrial Research Institute

関連論文

• Cleaning Effects of the Reactant in the Liquid-phase Isomerization of m-Xylene over a Silica-Alumina Catalyst under Pressure
• The Effect of Pressure on the Rate of the Acid-catalyzed Hydration of Propylene
• The Effects of Higher-boiling Compounds on the Liquid-phase Isomerization of m-Xylene over a Silica-Alumina Catalyst under Pressure
• The Formation of High-boiling By-products in the Isomerization and Disproportionation of m-Xylene over a Silica-alumina Catalyst under Pressure
• The Nature of a Bond between a Water Molecule and a Protonated Propylene in the Activated Complex for the Acid-catalyzed Hydration of Propylene
• Equilibria of the Isomerization of Xylene at 290°C under a Pressure of 300–6000 kg/cm2

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