トリレンジイソシアナートの製造に関する研究(第1報) : ジニトロトルエンの液相水素還元

概要

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In the liquid phase hydrogenation of dinitrotoluene (DNT) in 60% aqueous solution of tolylenediamine (TDA), the velocity of hydrogen absorption is proportional to the vapor-liquid contacting effect and the pressure of hydrogen, while the concentration of catalyst is proportional to a certain amount but has no relation beyond this amount. The effect of temp, is not so remarkable as in usual chemical reactions and also it has no relation with the concentration of DNT. Furthermore, the catalyst (Raney nickel) is rapidly poisoned when the concentration of DNT is high. The above result indicated that the hydrogenation of DNT should be made in such a way as to make a continuous feeding of it at a rate suitable for above reacting condition in order to reduce introduced DNT to TDA immediately. The solvent is unnecessary for the reaction by this method and DNT can be hydrogenated with high efficiency.