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Picture 1. Voikkaa paper mill.
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Picture 1. Voikkaa paper mill.
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Concomitant production of dissolving pu
polymeric xylan and lignin from birch wo
OBJECTIVES
Examine how dissolving pulp,polymeric xylan and ligninproduction can be combined
New value-added productsfrom noncellulosic sidestreams
Taneli Rautio
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Concomitant production of dissolving pu
polymeric xylan and lignin from birch wo
1. Process flowchart and structure
2. Comparison with existing
technology
3. Feasibility and conclusion
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1. Process flowchart
Polymeric
Xylan
Dissolving
PulpLignin
Precipitation
Washing ofsolid residue
Pre-hydrolysis
Alkaline pre-extraction
Birch chips
Nano- anddiafiltration
SAQ pulping
Overliming,DTAC
Figure1. Hierarchy of combined production.
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Process structure
1. Mechanical treatment of birch
2. Alkaline pre-extraction, NaOH/95oC3. Washing of solid residue
4. Pre-hydrolysis of solid residue, 160-180oC
Removal of hemicelluloses by autohydrolysis
5. Soda-anthraquinone (SAQ) pulping, SAQ/160oC
Delignification and bleaching to get dissolving Isolation of lignin from PHL with Overliming/D
6. Nano- and diafiltration
7. Precipitation
Polymeric xylan
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2. Comparison with existing technolo
Benefits+ High-quality products
+ Products have diverseapplications and economicalvalue
+ Refining of all sidestreamscan be localized
Transportation costs can beminimized
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2. Comparison with existing technolo
Benefits+ High-quality products
+ Products have diverseapplications and economicalvalue
+ Refining of all sidestreamscan be localized
Transportation costs can beminimized
Disadvantages- Dissolving pulp productrequires larger facilities tkraft pulp production
- Pre-extraction affects
dissolving pulp and polymxylan yield
- Requires lots of optimiz
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Figure 2. Graph showcasing the combined production.
Birch Wood
Pre-Extraction,
Cooking andPulping
New Products
and
Applications
Dissolving
PulpPolymeric
XylanLignin
3. CONCLUSION Alkaline production
methods have pote
Production of new pconsidered economfeasible
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Figure 2. Graph showcasing the combined production.
Birch Wood
Pre-Extraction,
Cooking andPulping
New Products
and
Applications
Dissolving
PulpPolymeric
XylanLignin
3. CONCLUSION Alkaline production
methods have pote
Production of new pconsidered economfeasible
Market succe More efficien
processes
FUTURE OUTLOO
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Picture 2. nekoski Bioproduct mill
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QUESTIONS?
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References
Testova, L., Roselli, A., Costabel, L., Kovasin, K., Tenkanen, M., Sixta, H., Combined Production of Polymeric Birch Xylan and Paper Pulp by Alkaline Pre-eFollowed by Alkaline Cooking, ACS Publications 2014
Sixta, H., Handbook of Pulp, WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim 2006
Kamm, B., Gruber, P., Kamm, M., Biorefineries
Industrial Processes and Products. Status Quo and Future Directions. Vol. 1, WILEY-VCH Verlag GmbH &Weinheim 2006
Shi, H., Fatehi, P., Xiao, H., Ni, Y.,A process for isolating lignin of pre-hydrolysis liquor of kraft pulping process based on surfactant and calcium oxide trBiochemical Engineering Journal 68 (2012) 19-24