Influence of Hydrogen Supply on By-Product Formation during the Hydrogenation of DNT to TDA

摘要

The hydrogenation of dinitrotoluene (DNT) to toluenediamine (TDA) is an important reaction for the polymer industry due to TDA's role as an intermediate in the production of polyurethanes (PL)). TDA is converted with phosgene to toluenediisocyanate (TDI) which is mainly used, together with polyether polyols, for the production of PU. How the catalysts are tested for DNT hydrogenation is very important for their development. Apart from catalyst activity, the amount of by-product formation (i.e."tar formation"; typically a few percent) is crucial for the process. This paper describes how the catalysts need to be tested for DNT hydrogenation and describes what is, apart from the catalyst, also responsible for byproduct formation.