Method for producing dnda

#Heretofore the energetic plasticizer DNDA-6-7, a ternary mixture of N,N′-dimethylbis-nitramine (DNDA-5; approx. 43%), N-methyl-N′-ethyl-bisnitramine (DNDA-6; approx. 45%) and N,N′-diethylbisnitramine (DNDA-7; approx. 12%), has been made in the following manner:

#1. Nitration of N,N′-dimethylurea

#1.1. Batch reaction with an acid mixture (mixture of nitric acid and sulfuric acid) with the addition of urea dissolved in dichloromethane at about −10° C.

#The following examples are intended to further explain the invention without limiting it.

#Common Nitration of the Ureas:

#355 ml of HNO3 (100%) is chilled to −15° C. A mixture of 25 g of diethylurea and 50 g of dimethylurea was added in portions with vigorous stirring. In the meantime the temperature is not to exceed −10° C. The stirring time after the addition is completed was another 30 min. The reaction solution was then fed onto ice water and collected by repeatedly, preferably four times, shaking it out in 250 ml of methylene chloride each time. Neutralization was performed with an aqueous bicarbonate solution.