ブナのアンモニウム・ベース・アルカリ性サルファイトケミカルパルプ化:II パルプの性質 Ammonium Base Alkaline Sulfite Chemical Pulping of Beech Wood.:Part 2 Chemical Properties of Pulps.
In the previous paper, it was shown that the yield of pulp obtained from beech wood, which was cooked by alkaline solution containing NH<SUB>4</SUB>OH and (NH<SUB>4</SUB>) <SUB>2</SUB> SO<SUB>3</SUB>, was higher than that of ordinary kraft pulp. (Pulp yield ; 64.655.8%, lignin content ; 6.90.9% based on wood) <BR>This paper discusses the properties of the pulps in order to elucidate the reason for high yield. Chemical constituents and intrinsic viscosity of the pulps are given in Table 1. It has been shown that the degradation of holocellulose has been decreased successively with increasing the amount of NH<SUB>4</SUB>OH in cooking liquor. The degradation of cellulose has been prevented by “stopping reaction”, which has been confirmed from the existence of C<SUB>6</SUB>-metasaccharinic acid in the hydrolyzates of cellulose. <BR>It is one of the reason for high pulp yield that the degradation of pentosans has been dropped rapidly by increasing the amount of NH<SUB>4</SUB>OH in cooking liquor. <BR>It has been supposed that aldonic acids consisted in cellulose-end groups was increased with increasing the amount of (NH<SUB>4</SUB>) <SUB>2</SUB>SO<SUB>3</SUB>, and acid hydrolysis of cellulose was proceeded successively.
紙パ技協誌 27(10), 469-475, 1973