Paper Titles

Preface, Committees, Sponsors and Reviewers

The Problems in Delignification of Dry Wood by Kraft Process
p.3

The Influence of the Long-Term Storage of Hardwood on the Selected Physical and Mechanical Properties in View of Pulping
p.10

Deep Eutectic Solvents as Medium for Pretreatment of Biomass
p.17

Stability of the Lignins and their Potential in Production of Bioplastics
p.25

Comparison of Different Methods for Extraction from Lavender: Yield and Chemical Composition
p.31

Influence of Chemical Treatment on Chemical Changes of Fir Wood
p.38

The Effects of Heat Treatment on the Chemical Alterations of Oak Wood
p.44

Engineering Approach for Computation of the Energy Consumption Needed for Defrosting and Subsequent Heating of Frozen Wood Chips
p.50

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The Problems in Delignification of Dry Wood by Kraft Process

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Abstract:

The objective of this study was to assess the causes of the problems arising in the CBC kraft cooking of several types of hardwood chips particularly in view of high dry matter but also in view of chip thickness and character of wood.High dry matter of processed chips influences negatively delignification. Similar effect on delignification is achieved by wood character (anatomic and morphological properties of cell elements, chemical composition, portion of heart and sapwood).Chips thickness has the most significant impact on delignification process comparing to other monitored characteristics. The increase of chips thickness by 1-2 mm has significant negative impact on monitored characteristics of kraft cooking – yield, Kappa number and amount of rejects.Displacement CBC kraft procedure is more sensitive on the deviation from standard conditions than conventional kraft cooking.The problems occurring during kraft cooking of different wood chips mixtures with high dry matter by CBC procedure are possible to resolve by technological and organizational precautions – separate chipping and storage of chips of heart and non-heart woods, preparation of thinner chips of heart wood, chips pre-vaporing before kraft cooking.

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Periodical:

Key Engineering Materials (Volume 688)

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3-9

DOI:

https://doi.org/10.4028/www.scientific.net/KEM.688.3

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Online since:

April 2016

Authors:

Anton Geffert*, Jarmila Geffertova, Blazej Seman

Keywords:

CBC (Continuous Batch Cooking) Procedure, Dry Wood, Kappa Number, Kraft (Sulphate) Process, Penetration of Cooking Solution

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© 2016 Trans Tech Publications Ltd. All Rights Reserved

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