Oxidative delignification of wheat straw: peroxide cooking and alkaline extraction .

The stalks of wheat straw Triticum sp., harvested in the Yemelyanovsky District of the Krasnoyarsk Krai, were delignified by an oxidizing method in two stages. Initially, segments of stalks 2...3 cm long were treated with an aqueous solution of hydrogen peroxide and acetic acid (the first stage). Acetic acid is oxidized to peracetic acid, which in turn oxidizes lignin. Conditions of the oxidizing stage: initial concentration of acetic acid is 36 %, hydrogen peroxide – 12 %, sulfuric acid (catalyst for the formation of peracetic acid) – 0.45 %; hydromodule 3; temperature 85 °C; duration is 2 hours. Then, the semi-cooked product obtained with a yield of 85.8 % in the form of undivided fibers was treated with an aqueous solution of sodium hydroxide (second stage) to dissolve oxidized lignin. Conditions of the second stage: hydromodule 3; temperature 85 °C; alkali concentration was changed in the range from 2 to 4 %, duration – from 0,5 to 1,5 hours. The dependences of the yield of technical pulp and “non-steam” on variable factors were approximated by second-order regression equations, which were used to graphically represent the results in the form of response surfaces and calculate optimal process conditions by nonlinear mathematical programming. The maximum yield of technical cellulose of 40.2 % in the absence of “non-steam” was obtained at an alkali concentration of 3.6 % and a duration of 1.5 hours.

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