STUDY ON PREPARATION OF PREHYDROLYSIS-KRAFT VISCOSE PULP FROM REED

摘要

Two-stage (prehydrolysis-kraft) pulping and CEHA bleaching process of reed were investigated in this paper. The results showed that the optimum prehydrolysis conditions are as follows: maximum temperature 175°C, treatment time at maximum temperature 90 minutes, liquor ratio 1:6. The results also showed that the optimum cooking conditions of kraft pulping are as follows: maximum temperature 175°C, treatment time at maximum temperature 30 minutes, sulfidity 15%, liquor ratio 1:4. A CEHA four stage bleaching was used for preparation of reed viscose pulp. Total chlorine charge in bleaching was 6% (to oven-dry pulp). The results showed that all of the indices fitted the quality standards of viscose pulp under the above optimum conditions.