Chemische Untersuchungen an Verbindungen aus Lignin mit Cyanamid,Kalkstickstoff sowie Dicyandiamid

Chemical investigations on reaction products from lignin and cyanamide, Ca-cyanamide, as well as dicyandiamide Chemical interactions between lignin from Triticum aestivum and cyanamide, “Kalkstickstoff” (Ca-cyanamide) as well as dicyandiamide were proved. The methods used to indicate the oxygen absorption, gas release, typical structures and reaction procedures, specially carbonylgroups, the nucleophilic addition and esterification were the WARBURG-Technik, infrared-spectroscopy, measurement of pH-values and color reactions with phloroglucine/HCl. Additionally the C- and N-content was determined. The N-containing reaction products formed at maximal 30°C were isolated after 3–5 weeks and purified. Dyanamide (H₂CN₂) and “Kalkstickstoff” (CaCN₂) reacted already in water with lignin. In opposite dicyandiamide first displayed chemical interactions to a larger extent after CaO had been added. The reaction with the nitrogen-containing compounds by nucleophilic addition only reduced the carbonyl groups (keto and aldehyde) of lignin. The N-content of the reaction products ranged from (0,37 % lignin with cyanamide + CaO or CaCN₂ + CaO) to 1,2 % (lignin + dicyandiamide + CaO). Even the lowest of these values corresponds already a maximal bond of ～ 7 kg poor N/ha with respects to the lignin of a wheat harvest.