Comparison of acid sulfite (AS)- and prehydrolysis kraft (PHK)-based dissolving pulps

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• 作者：Chao Duan ; Jianguo Li ; Xiaojuan Ma ; Chunxia Chen ; Yishan Liu ; Jaroslav Stavik…
• 关键词：Dissolving pulp ; Acid sulfite (AS) ; Prehydrolysis kraft (PHK) ; Viscose ; Reactivity
• 刊名：Cellulose
• 出版年：2015
• 出版时间：December 2015
• 年：2015
• 卷：22
• 期：6
• 页码：4017-4026
• 全文大小：769 KB
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• 作者单位：Chao Duan (1) (2)
  Jianguo Li (1) (2)
  Xiaojuan Ma (2) (3)
  Chunxia Chen (2) (4)
  Yishan Liu (2) (5)
  Jaroslav Stavik (6)
  Yonghao Ni (1) (2)
  
  1. Tianjin Key Laboratory of Pulp and Paper, Tianjin University of Science and Technology, Tianjin, 300457, China
  2. Limerick Pulp and Paper Centre, University of New Brunswick, Fredericton, NB, E3B 5A3, Canada
  3. College of Material Engineering, Fujian Agriculture and Forestry University, Fuzhou, 350002, China
  4. National Paper Products Quality Supervision Inspection Center, Dongguan Quality Supervision Testing Center, Dongguan, 523808, China
  5. Institute of Paper Science and Technology, Sichuan University of Science and Engineering, Zigong, Sichuan, 643000, China
  6. AV Nackawic Inc., Nackawic, NB, E6G 1W4, Canada
  
• 刊物类别：Chemistry and Materials Science
• 刊物主题：Chemistry
  Bioorganic Chemistry
  Physical Chemistry
  Organic Chemistry
  Polymer Sciences
  
• 出版者：Springer Netherlands
• ISSN：1572-882X

文摘

The processability and quality of viscose are mainly influenced by the properties of dissolving pulps. Acid sulfite (AS) and prehydrolysis kraft (PHK) are the main commercial processes for the production of dissolving pulps. In this paper, the properties of dissolving pulps obtained from the AS and PHK processes, with respect to purity, molecular weight distribution (MWD), porosity, surface area, accessibility and reactivity, were comparatively evaluated. The results indicated that the PHK pulps had higher α-cellulose, lower S₁₀/S₁₈ content, and narrower MWD than the AS pulps, which can be ascribed to the different reaction mechanisms in the acid and alkaline pulping processes. The traditional parameters (S₁₀/S₁₈, α-cellulose and intrinsic viscosity) were insufficient to evaluate the pulp quality when comparing with dissolving pulps from different pulping processes. The Fock reactivity and the Chinese filterability tests were applied to evaluate their end-use properties in the rayon production process. The AS pulps had better accessibility than the PHK pulps (larger pore size and volume and thinner primary wall), supporting the conclusion that the AS samples exhibited higher reactivity that the PHK samples. The results from the Fock reactivity and Chinese filterability corresponded well. Keywords Dissolving pulp Acid sulfite (AS) Prehydrolysis kraft (PHK) Viscose Reactivity