| 摘要 |
The present invention relates to a method of preparing para-phenylenediamine, and more particularly, to a method of preparing para-phenylenediamine with excellent yield and excellent purity including: a first step of making sodium urate, potassium urate, or urate that is a mixture thereof react with mono-nitrobenzene at 40 to 120°C to prepare 4-nitrosoaniline; and a second step of performing a hydrogenation reaction of the prepared 4-nitrosoaniline to prepare para-phenylenediamine, wherein urate with excellent thermal stability is used as a reactant to prepare 4-nitrosoaniline with a high conversion rate and good yield without generating a by-product, such as carbonate, and ammonia. |
