CELLULOSE MANUFACTURING PROCESS Russian patent published in 2008 - IPC D21C5/00 D21C3/02 D21C3/04 

FIELD: paper-and-pulp industry.

SUBSTANCE: invention is directed to manufacture fibrous intermediate products from agricultural wastes originating from groats and grain crop (straw and fruit coats) processing. Cellulose manufacturing process is conducted in two steps. In the first step, preliminarily milled annual plants are treated with NaOH solution having concentration 20-60 g/L at temperature not lower than 70°C during at least 20 min. Cellulose-containing raw material is then separated from alkali solution. In the second step, pulping is conducted with mixture of peracetic acid, acetic acid, and hydrogen peroxide at weight ratio (1.25-1.75):1.0:(0.25-0.75), respectively, used in amount 0.3-1.0 g per 1 g bone-dry raw material in presence of stabilizer selected from organic phosphonate series, namely organophosphonate mixture containing sodium nitrilotrimethylenephosphonate and sodium methyliminodimethylenephosphonate salts as major components. Stabilizer is added in amount 0.005-0.02% based on the weight of bone-dry raw material.

EFFECT: extended resource of raw materials, improved quality of desired product, and thereby enabled manufacture of high-quality cellulose products and reduced expenses on industrial-scale cellulose manufacture.

6 cl, 4 tbl