SULPHATE COOKING OF THE DEAD SOFT WOOD

The samples of dead wood (the pine, spruce, fir, cedar), damaged in 2017 by the siberian silkmoth and cedar-tree borer is displayed at April 2022 on Yenisei region Krasnoyarsk Territory with for sulphate delignification, optimization cooking process, estimation unbleached cellulose characteristics, determination possibility its use as fibrous semi-finished product cellulose-paper production. cookings are executed laboratory autoclave under following constant conditions: hydromodule 4.8; degree sulfiditiy solution 20.8%; temperature 170 °C. In course experiment varied active alkali consumption (15.5–18.5% from mass unit Na2O) duration isothermal (4.5–6.5 hours). dependencies output characteristics these factor approximated regression equations second order. Mathematical model cookig process obtained such way used graphic presentation result type three-dimensional surfaces response calculation best values variable factor: 16.2%; 6.1 hour. All was be separately optimal regime. results: 37.9–41.3%; no-cooked part less 1%; delignification 23–29 Kаppа lignin 3.38–4.21%); explosive length 8130– 9250 m; forcing through resistance 400–490 кPа; tearing 630–870 mmN; break 380–460 bends. characteristic all answer to mark NS-3. It noted significant reduction (on 10–2%) comparison similar sound wood.