Studies on Pulping with the Addition of the Reducing Agents (I)

Abstract

The kraft pulp cooking with the addition of hydrazine as the reducing agent has been studied. The yield of pulp (I) by the addition of hydrazine was 10% more than the normal kraft pulp (II), its color was more light and glossy, and its cooking degree was the same as that of pulp (II). The analytical results of pulp showed that the relative viscosity of pulp (I) was much higher than that of pulp (II), and that chlorine number and pentosan contents were little different in both pulps (I) and (II). The pulp handsheets were prepared and tested on burst factor, breaking length, tear factor and brightness.