abstract |
Toluenediamine (TDA) tar is mixed with hydrogen under hydrogenation conditions and at least one selected from the group consisting of Ni, Co, Ru, Pd, and Pt on one or more catalyst carriers selected from the group consisting of carbon, TiO 2 and ZrO 2 A process for hydrogenating TDA and TDA tar containing high boiling substances compared to TDA, comprising the step of contacting with a heterogeneous hydrogenation catalyst comprising a metal. |