| abstract |
The invention discloses a two-step hydrogenation method for preparing N1-(2-aminoethyl)-1,2-ethylenediamine. Under the effect of a first hydrogenation catalyst, over 80% and lower than 99% of iminodiacetonitrile is converted into an intermediate imine; and under the effect of a second hydrogenation catalyst and an addition agent, N1-(2-aminoethyl)-1,2-ethylenediamine reaction solution is obtained, and the conversion rate of iminodiacetonitrile is 100%. According to the method, large-scale continuous production of N1-(2-aminoethyl)-1,2-ethylenediamine can be achieved, selectivity of N1-(2-aminoethyl)-1,2-ethylenediamine is improved, the content of by-products is reduced, and generation of high polymer is reduced. |