Cheryopkina R. Development of the methods high yields pulp reception from the Canadian poplar wood

The new options of neutral sulfite and acid bisulfite methods of digestion providing the quality cellulose reception with the yield of 60 – 65% from сanadian poplar wood are developed and experimentally confirmed. The influence of the temperature conditions, SO2 concentration in the solution, pH and time of the digestion on the wood delignification, cellulose yield and its quality has been studied. The positive influence of the anthraquinone on the wood delignification process by neutral sulfite digestion carried out in the alkalescent medium is shown. The influence of the reuse spent lye at the neutral sulfite digestion and a possibility of its use as the technical lignosulphonates is investigated. The possibility of the cellulose bleaching, received by means of neutral sulfite and acid bisulfite methods, by peroxide is studied. The paper formative properties bleached and unbleached pulps are investigated. The cellulose suitableness received by means of neutral sulfite and acid bisulfite methods forproduction of a paper for the offset printing and imitation of the parchment is shown.