Mechanisms and Defiberation Point of Pinus Kesiya Diethanolamine Pulping

Mechanisms and defiberation point of pinus kesiya diethanolamine pulping were analyzed in this paper. The results show that the delignification of diethanolamine cooking is divided into three stages: the initial delignification stage, which is from the beginning of heating to 170°C, and its delignification rate is about 30%; the bulk delignification stage, which is from 170°C to 200°C for 60min with the total delignification rate about 90%; the supplementary delignification stage, which is from 200°C for 60min to the end of cooking, and its delignification rate is more than 97%. And the defiberation point is at 200°C for 30min nearby.