METHOD FOR PRODUCTION OF FIBROUS SEMI-PRODUCT OF MISCANTHUS

FIELD: chemistry.SUBSTANCE: method includes impregnating a miscanthus cutting in a solution containing an alkali metal hydroxide， a surfactant and a stabilizer at temperature not higher than 70??°C for 0.5–12 hours with subsequent separation of impregnating solution. After that thermo-chemical treatment of cutting in alkaline medium is carried out at temperature 80–120??°C for 20–60 minutes. Then， the cutting is condensed to concentration of 60–70??% with separation of the spent alkaline solution， diluted with water or solution of bleaching chemicals and milled to obtain a pulp. Mass is sorted， and screening wastes are milled together with a cutting after thickening. Alkali metal hydroxide used is sodium hydroxide or potassium hydroxide at concentration of 12–23??g/dm3in amount of 2.0–4.0??% of the weight of absolutely dry material. Surfactant used is OP-7 or OP-10 - which is a product of treating a mixture of mono- and dialkylphenols with ethylene oxide， surfactants， in amount of 0.025–0.09??% of the weight of the absolutely dry material. Stabilizer used is trilon B - disodium salt of ethylenediaminetetraacetic acid (EDTA-Na2)， trilon C - diethylenetriamine pentaacetic acid (DTPA) in amount of 0.03–0.25??% of the weight of absolutely dry material. Bleaching chemicals used are sodium dithianite or an alkaline solution of hydrogen peroxide， with consumption of H2O2equal to 2–4??%， NaOH equal to 0.8–1.2??% and Na2S2O4- 0.6–0.8??%.EFFECT: invention relates to production of fibrous semi-products and can be used in pulp-and-paper industry in production of disposable tableware and in production of various types of cardboard.5 cl， 1 tbl