METHOD FOR PREPARING NITROGEN-CONTAINING DERIVATIVES OF LIGNOCARBOHYDRATE MATERIALS Russian patent published in 2003 - IPC

FIELD: chemical technology. SUBSTANCE: invention relates to chemical processing of lignocellulose materials. Lignin-containing raw is subjected for intensive vibration milling in the presence of 25% an aqueous ammonia under air pressure 1-9 atm for 10-120 min at 20 C. Due to enhanced concentration of ammonia to 25% hydromodulus value id reduced from 10-30 to 2-23 (ammonia content is 0.5-3 g/g) that allows to carry out ammonolysis process by mechanochemical method. Prepared products comprise 1.1-3.3% of total nitrogen, 2.7-11.9% of carboxy-groups and can be used as organic fertilizers and cation-exchange resins. Invention can be used for preparing nitrogen-containing organomineral fertilizers with the prolonged effect based on lignocarbohydrate vegetable materials also. EFFECT: improved preparing method. 4 tbl