METHOD FOR PREPARING NITROGEN-CONTAINING ORGANIC FERTILIZER BASED ON LIGNO-CARBOHYDRATE SUBSTANCES Russian patent published in 2008 - IPC C05C11/00 C08H5/04 C07G1/00 

FIELD: chemical technology.

SUBSTANCE: invention relates to chemical processing wood. Ligno-containing raw as air-dried saw-dust is treated with ammonium persulfate aqueous solution at temperature 60^oC under conditions of cavitation treatment in rotor-pulsed device at the rotor revolution rate 3000 rev/min/. Treatment is carried out for 0.25-1.0 h at the concentration of ammonium persulfate 0.2-0.8 g/g of raw and at the concentration of ammonia 0.5-2.0 wt.-%. Method provides decreasing the ammonium consumption and peroxy-compound as an oxidant, duration of the process that allows decreasing cost of the technological process. High-molecular materials prepared by the proposed method comprise up to 4.3% of bound nitrogen. About 17-25% of bound nitrogen is released as ammonium at acid and alkaline hydrolysis, and the remained amount of nitrogen is tightly bound with wood. Nitrogen-containing materials comprise up to 6.8% of carboxyl groups and 20.5% of lignin. Invention provides decreasing consumption of ammonium persulfate by 7.5-9 times, decreasing the concentration of ammonium up to 0.5-2.0 wt.-% and declining of the process period from 2 to 0.25-1 h. Invention can be used for preparing nitrogen-containing fertilizers and sorbents based on ligno-carbohydrate raw.

EFFECT: improved preparing method.

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