Dissolving pulp production: Cellulases and xylanases for the enhancement of cellulose accessibility and reactivity

2021 ◽  
Vol 0 (0) ◽  
Author(s):  
Amit Kumar
Keyword(s):  
High Reactivity ◽  
Dissolving Pulp ◽  
High Grade ◽  
Cellulose Accessibility ◽  
Cellulose Acetates ◽  
Basic Source ◽  
Dissolving Pulps ◽  
Different Sources ◽  
Cellulose Nitrates ◽  
Pulp Production

Abstract Dissolving pulps are high-grade cellulose pulps that have minimum amount of non-cellulosic impurities. Dissolving pulps are the basic source for the manufacturing of several cellulosic products such as viscose, lyocell, cellulose acetates, cellulose nitrates, carboxymethyl-cellulose, etc. Dissolving pulps are mainly manufactured by pre-hydrolysis kraft and acid sulphite pulping. A high reactivity of dissolving pulps is desirable for its eco-friendly utilization for several purposes. Several approaches including mechanical, chemical, ultrasonic, and enzymatic treatments have been employed for the improvement of pulp reactivity. This review mainly focussed on pulp reactivity improvement through enzymatic approaches. Cellulases and xylanase have been proved effective for the improvement of pulp reactivity of dissolving pulp from different sources. The different combinations of cellulase, xylanase, and mechanical refining have been tested and found more effective rather than the single one.

Novel concepts of dissolving pulp production

Cellulose ◽  
2013 ◽  
Vol 20 (4) ◽  
pp. 1547-1561 ◽  
Author(s):  
Herbert Sixta ◽  
Mikhail Iakovlev ◽  
Lidia Testova ◽  
Annariikka Roselli ◽  
Michael Hummel ◽  
...  
Keyword(s):  
Dissolving Pulp ◽  
Pulp Production

scholarly journals The Manufacture of a High Grade Dissolving Pulp. Part I

1960 ◽  
Vol 34 (12) ◽  
pp. 981-985
Author(s):  
Kaoru KAWASE ◽  
Yasuo FUJIOKA ◽  
Yusaku FUKUDA
Keyword(s):  
Dissolving Pulp ◽  
High Grade

Brightness stability of eucalyptus-dissolving pulps: effect of the bleaching sequence

Holzforschung ◽  
2017 ◽  
Vol 71 (7-8) ◽  
pp. 625-631 ◽  
Author(s):  
Jordan Perrin ◽  
Dominique Lachenal ◽  
Christine Chirat
Keyword(s):  
Heat Exposure ◽  
Dissolving Pulp ◽  
Paramagnetic Resonance ◽  
Bleached Pulp ◽  
Alkaline Peroxide ◽  
Elemental Chlorine ◽  
Brightness Reversion ◽  
Dissolving Pulps ◽  
Ultraviolet Resonance Raman

Abstract The factors governing the brightness reversion (BR) of dissolving pulps under heat exposure are investigated. Carbonyl (CO) groups were artificially introduced on fully bleached pulp by sodium hypochlorite (NaClO) oxidation. It was demonstrated that the CO groups are responsible for loss of brightness stability (BS). These groups were partly eliminated by an alkaline extraction stage (E), which improved BS. However, an alkaline peroxide stage (P) was more efficient than E to improve BS, but without any additional CO loss. Moreover, an unbleached dissolving pulp was bleached in the laboratory by elemental chlorine free (ECF) and totally chlorine free (TCF) [ozone-based] sequences to the same brightness. The very low CO content was about the same in both cases. The ECF-bleached pulp showed substantially lower BS than the TCF pulp. These results are interpreted such that the chemistry of chromophores in the unbleached pulp also governs BS. In situ detection of phenolic and quinone chromophores in bleached dissolving pulp was performed by electron paramagnetic resonance (EPR) spectroscopy and ultraviolet resonance Raman (UVRR) spectroscopy. The content of these groups was bleaching-sequence-dependent, which may be related to the BS differences.

Changes of cellulose accessibility to cellulase due to fiber hornification and its impact on enzymatic viscosity control of dissolving pulp

Cellulose ◽  
2015 ◽  
Vol 22 (4) ◽  
pp. 2729-2736 ◽  
Author(s):  
Chao Duan ◽  
Yunduo Long ◽  
Jianguo Li ◽  
Xiaojuan Ma ◽  
Yonghao Ni
Keyword(s):  
Dissolving Pulp ◽  
Cellulose Accessibility

Water Prehydrolysis of Moso Bamboo Dissolving Pulp

2013 ◽  
Vol 750-752 ◽  
pp. 1586-1592
Author(s):  
Tao Gu ◽  
Li Qing Weng ◽  
Guo Xin Xue
Keyword(s):  
Retention Rate ◽  
Dissolving Pulp ◽  
Moso Bamboo ◽  
Cellulose Content ◽  
High Grade ◽  
Single Factor ◽  
Optimum Conditions ◽  
Wood Material ◽  
Factor Method ◽  
High Cellulose

The chemical comcomposition and water prehydrolysis of moso bamboo were studied to prepare high grade dissolving pulp. The results indicated that the moso bamboo was an appropriate none-wood material for great dissolving pulp goten as its high cellulose content. By single factor method, the optimum prehydrolysis conditions which were 150°C, 120minutes and 1:8 of liquor-to-wood tatio, were obtained. Based on the optimum conditions, the yield was 90.35%, and the retention rate of cellulose, pentosan, acid accumulator insoluble lignin, and ash were respectively 96.30%, 88.22%, 88.13%, and 11.71%.

scholarly journals A biorefinery scheme to fractionate bamboo into high-grade dissolving pulp and ethanol

2017 ◽  
Vol 10 (1) ◽  
Author(s):  
Zhaoyang Yuan ◽  
Yangbing Wen ◽  
Nuwan Sella Kapu ◽  
Rodger Beatson ◽  
D. Mark Martinez
Keyword(s):  
Dissolving Pulp ◽  
High Grade
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