CHITOSAN PRODUCTION METHOD Russian patent published in 2017 - IPC C08B37/08 

FIELD: agriculture.

SUBSTANCE: chitosan production method is proposed, comprising grinding of insect puparia, alkaline treatment of chitin-containing raw materials with constant strirring at elevated temperature and further washing of the remainder with distilled water. Musca domestica puparia are used. Alkaline treatment is carried out at a temperature of 80°C with 1-1.5% alkali. Two-stage treatment is additionally performed with 3.5-5% hydrochloric acid and 4.5-5% sodium hydroxide while stirring for 1.5-2 hours at each stage, followed by filtration and washing of dry extract obtained after each processing stage with distilled water. Puparia are pre-washed with water from foreign substances before grinding.

EFFECT: increased finished product output.

2 tbl, 3 ex