FIELD: textile, paper.
SUBSTANCE: method includes two stages of rice straw boiling. The first boiling stage is carried out in the alkaline medium with subsequent separation of cellulose-containing product, the second stage of boiling is carried out in the acid medium by mixture of peracetic acid (PAA), acetic acid and hydrogen peroxide in presence of a stabiliser, such as a mixture of organic phosphonates. At the same time the second stage of boiling is carried out in presence of ozone with a flow rate of 2-4 g/hr.
EFFECT: reduced flow of composition based on PAA, higher yield of finished product, reduced content of lignin and increased whiteness indices.
2 cl, 1 tbl
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