Alkali consumption of aliphatic carboxylic acids during alkaline pulping of wood and nonwood feedstocks
Pakkanen, H., & Alén, R. (2013). Alkali consumption of aliphatic carboxylic acids during alkaline pulping of wood and nonwood feedstocks. Holzforschung: international journal of the biology, chemistry, physics and technology of wood, 67(6), 643-650. https://doi.org/10.1515/hf-2012-0143
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Holzforschung: international journal of the biology, chemistry, physics and technology of woodDate
2013Copyright
© De Gruyter, 2013. Published in this repository with the kind permission of the publisher.
The carbohydrate degradation products have
been examined, which are formed during the conventional
kraft pulping of a softwood, hardwoods, bamboo,
and wheat straw as well as soda and soda-anthraquinone
pulping of wheat straw. The focus was on “volatile” acids
such as formic and acetic acids and “ nonvolatile ” hydroxy
monocarboxylic and dicarboxylic acids. The different
consumption profiles were obtained for the charged alkali
required for the neutralization of these aliphatic acids
depending on the feedstock and the cooking method. The
relative composition of the acid fraction in the black liquors
of softwood and hardwood and nonwood feedstocks
showed characteristic variations. However, in the case of
wood kraft pulping, the variations in cooking conditions
(effective alkali 19 – 21 % and cooking temperature 155 –
170 ° C) had no significant effect on the acid composition.
The total amount of volatile and hydroxy acids formed
during pulping at a typical target κ number level for each
feedstock ranged from 78 to 174 kg ton -1 based on o.d. feedstock.
It was highest in birch kraft pulping and lowest in
wheat soda-anthraquinone pulping.
...


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