The reaction between urea and melamine was studied. The reaction resulted in tris-carbamide derivative of melamine. During the reaction between the melamine derivative and the glycoside group of chitosan the sim-triazine functional groups were formed, which are included in the structure of synthesized derivative of chitosan. The synthesized derivative of chitosan was tested. It is recommended to use this chitosan derivative as an absorbent for the separation of heavy metal ions such as Cd2+, Hg1+, Hg2+, Co2+, Ag1+, As3+, As5+, etc. from the aqueous solutions of salts.

The kinetic laws of the condensation reaction between metal acetates are investigated: -manganese and copper Me[OC(O)CH 3 ] 2 (Me(Ac) 2 ) with N-methylolurea. The numerical values of the rate constant at various temperatures and the activation energy of the condensation process between these compounds are estimated. A conclusion is drawn regarding the activity of the acetates of the studied metals in the reactions of their interaction with N-methylolurea.