Authors: Chao Duan Jianguo Li Xiaojuan Ma Chunxia Chen Yishan Liu Jaroslav Stavik Yonghao Ni
Publish Date: 2015/10/10
Volume: 22, Issue: 6, Pages: 4017-4026
Abstract
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 αcellulose 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 αcellulose 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 enduse 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 wellThe authors gratefully acknowledge the financial support from the Canada Research Chairs and NSERC CRD programs and the Tianjin Municipal Science and Technology Commission Grant No 12ZCZDGX01100 The authors also thank Ven Reddy from department of science in University of New Brunswick UNB for the XRD measurements
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