Rh-UO3触媒上におけるアルキル芳香族の加圧水蒸気脱アルキル反応
1977 年 20 巻 2 号 p. 134-138
詳細
1977 年 20 巻 2 号 p. 134-138
The effect of reaction pressure on the catalytic behavior such as activity, selectivity and product patterns for the steam dealkylation of toluene and xylene isomers was studied under the pressure ranging from 0 to 30kg/cm2•G. The conversion of toluene into benzene over the Rh or Ni catalyst increased considerably with the rising reaction pressure without the deterioration of benzene selectivity. On the contrary, a marked decrease in the dealkylation rate was observed over the Rh-UO3 catalyst. Quite a large amount of CH4 (25.8mol%) was observed at 30kg/cm2 in comparison with the amount of CH4 (3.3mol%) at the atmospheric pressure. The predominant part of CH4 may be considered to be formed by consecutive hydrodealkylation of aromatics which proceeds more readily at the higher pressure.
The reaction between steam and non-aromatic hydrocarbons such as n-heptane, methylcyclohexane and isooctane and the steam dealkylation of toluene and xylene fractions of the naphtha thermally cracked residue containing non-aromatics were also studied for the effect of pressure.
