The Research on Preparation Technology of Poplar Slab Dissolving Pulp

Abstract:

In this paper, prehydrolysis was used as the first treatment of poplar slab for producing high-grade dissolving pulp, the optimum prehydrolysis conditions of poplar were obtained as followings: liquid ratio 1:6, H2SO41.0%, the highest temperature of 160±5°C, heating time of 90min, holding time of 120min. Hydrolyzed poplar slab was cooked to determine the effects of various alkali charges on pentosans, alpha-cellulose, kappa number, and degree ofpolymerization (DP). The optimum cooking process conditions of poplar were obtained as followings: alkali dosage 24%, sulfidity 5% ,the highest temperature of 160±5°C, heating time of 60min, holding time of 120min.Cooked pulps were bleached using Op-Q-P sequence. As a consequence, the poplar slab dissolving pulp of pentosan 3.73%, alpha-cellulose 95.13%,kappa number1.58, brightness 86.4%ISO, degree of polymerization (DP) 488.84 was obtained in our laboratory.

• Periodical: Advanced Materials Research (Volume 848)
• Pages: 346-349
• DOI: https://doi.org/10.4028/www.scientific.net/AMR.848.346
• Online since: November 2013
• Authors: Li Juan Bing, Chao Jun Wu, Dai Qi Wang, Dong Mei Yu
• Keywords: Dissolving Pulp, Poplar Slab, Pre-Hydrolysis

References

[1] Chenyu Xiao, Shengling Wang, Forest rational utilization of wood residues [J]. Forest engineering, 2007, 23(6): 1-5.

[2] Yongqing Hu, Jun Qian. Woodworking efficient use of the remaining slab Analysis and Prospect [J]. Woodworking machines，2010, 21(3): 49-51.

[3] Shulan Shi, Fuwang He. Analysis and detection of pulp and paper [M]. China Light Industry Press, (2009).