Abstract
One way to obtain high quality pulp production is to improve selectivity delignification of step, maximize yield. Brown pulp yield and chemical composition were studied, with variation of temperature and effective alkali in Kraft cooking. Considering that these variables directly affect lignin removal rate and final product quality. Industrial wood chips from Eucalyptus grandis x Eucalyptus urophylla hybrids were used in this study. The cooking was performed to obtain pulps with kappa number 13, 15 and 17 for temperatures 155 °C, 160 °C and 165 °C, using the same Factor H (695). Yields were analyzed according to: total yield, rejects content and screened pulp yield. Klason lignin content, wood and pulp sugars, levels of hexenuronic acids in pulp were also determined. Results indicate that lower cooking temperatures are beneficial in relation to cooking performance, selectivity and preservation of xylans. With a screened pulp yield of 57.1 % for KN 17 at the lowest temperature 155 ºC and 55.3 % at the same KN at 165 ºC. The lowest screened pulp yield obtained, 51 %, was for KN 13 at 165 ºC, with 54.1 % with the same KN at 155 ºC. Evidencing a decreasing linear trend of screened pulp yield with temperature increase and kappa number reduction.
Funding source: Coordenação de Aperfeiçoamento de Pessoal de Nível Superior
Funding statement: The authors acknowledge Brazilian funding agencie CAPES (Coordinator for the Improvement of Higher Level Personnel) for scholarship to J. S. C. Favaro.
Conflict of interest: The authors declare no conflict of interest.
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© 2021 Walter de Gruyter GmbH, Berlin/Boston
Artikel in diesem Heft
- Frontmatter
- Review
- Aspects on bond strength in sheet structures from TMP and CTMP – a review
- Chemical pulping
- The impact of using different wood qualities and wood species on chips produced using a novel type of pilot drum chipper
- Temperature and effective alkali effect on brown pulp kraft cooking
- Mechanical pulping
- On the modeling of pulp properties in CTMP processes
- Paper technology
- Pulp pumping efficiency I – A critical review on loss and its estimation
- Pulp pumping efficiency II – Designing of a pulp pump
- Three-dimensional scanning electron microscopy used as a profilometer for the surface characterization of polyethylene-coated paperboard
- Paper chemistry
- Ageing mechanisms of the papers with zeolite and PCC fillers
- Synthesis of macro-RAFT agent containing M13-10 and its application in surface sizing agent
- Coating
- The role of MFC and hydrophobically modified ethyl(hydroxyethyl)cellulose in film formation and the barrier properties of methyl nanocellulose film
- Printing
- Fabrication of rosemary essential oil microcapsules and using in active packaging
- Packaging
- Development of a nonwetting coating for packaging substrate surfaces using a novel and easy to implement method
- Recycling
- Wet route pellets production using primary sludge from kraft pulp mill
- Chemical technology/modifications
- Modification of cellulosic filler with diisocyanates – volatile organic compounds emission assessment and stability of chemical structure over time
- Characterization and application of wood-ZrO2 sorbent for simultaneous removal of chromium (III) and chromium (VI) from binary mixture
Artikel in diesem Heft
- Frontmatter
- Review
- Aspects on bond strength in sheet structures from TMP and CTMP – a review
- Chemical pulping
- The impact of using different wood qualities and wood species on chips produced using a novel type of pilot drum chipper
- Temperature and effective alkali effect on brown pulp kraft cooking
- Mechanical pulping
- On the modeling of pulp properties in CTMP processes
- Paper technology
- Pulp pumping efficiency I – A critical review on loss and its estimation
- Pulp pumping efficiency II – Designing of a pulp pump
- Three-dimensional scanning electron microscopy used as a profilometer for the surface characterization of polyethylene-coated paperboard
- Paper chemistry
- Ageing mechanisms of the papers with zeolite and PCC fillers
- Synthesis of macro-RAFT agent containing M13-10 and its application in surface sizing agent
- Coating
- The role of MFC and hydrophobically modified ethyl(hydroxyethyl)cellulose in film formation and the barrier properties of methyl nanocellulose film
- Printing
- Fabrication of rosemary essential oil microcapsules and using in active packaging
- Packaging
- Development of a nonwetting coating for packaging substrate surfaces using a novel and easy to implement method
- Recycling
- Wet route pellets production using primary sludge from kraft pulp mill
- Chemical technology/modifications
- Modification of cellulosic filler with diisocyanates – volatile organic compounds emission assessment and stability of chemical structure over time
- Characterization and application of wood-ZrO2 sorbent for simultaneous removal of chromium (III) and chromium (VI) from binary mixture